NEUROCRINE BIOSCIENCES INC
10-K, 1998-04-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                   FORM 10-K
                            ------------------------
(MARK ONE)
[X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997
 
                                       OR
 
[ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934
 
                         FOR THE TRANSITION PERIOD FROM
                               --------------- TO
                               --------------- .
 
                        COMMISSION FILE NUMBER: 0-28150
 
                          NEUROCRINE BIOSCIENCES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                              <C>
                    DELAWARE                                        33-0525145
          (STATE OR OTHER JURISDICTION                           (I.R.S. EMPLOYER
       OF INCORPORATION OR ORGANIZATION)                      IDENTIFICATION NUMBER)
     3050 SCIENCE PARK ROAD, SAN DIEGO, CA                            92121
    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)                         (ZIP CODE)
</TABLE>
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (619) 658-7600
        SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT: NONE
SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT: COMMON STOCK, $0.001
                                   PAR VALUE
 
     Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]  No [ ]
 
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of the registrant's knowledge, in definitive proxy or information
statements incorporated by reference in Part III of this Form 10-K or any
amendment to this Form 10-K.  [ ]
 
     The aggregate market value of the voting stock of the issuer held by
non-affiliates of the issuer on February 27, 1998 was approximately
$123,019,669, based upon the closing price of such stock of $8.25 on February
27, 1998. As of February 27, 1998, 17,707,815 shares of Common Stock of the
registrant were outstanding.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
     Certain information required by Part III of this Form 10-K is incorporated
by reference from the Registrant's Proxy Statement for the Annual Meeting of
Shareholders to be held on May 25, 1998 (the "Proxy Statement"), which will be
filed with the Securities and Exchange Commission within 120 days after the
close of the Registrant's fiscal year ended December 31, 1997.
 
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<PAGE>   2
 
                                     PART I
 
ITEM 1. BUSINESS
 
INTRODUCTION
 
     Neurocrine Biosciences, Inc. is a leading neuroimmunology company focused
on the discovery and development of novel therapeutics to treat diseases and
disorders of the central nervous and immune systems. The Company's neuroscience
and immunology disciplines provide a biological understanding of the molecular
interactions between the central nervous, immune and endocrine systems leading
to therapeutic opportunities for diseases and disorders such as anxiety,
depression, Alzheimer's disease, obesity and multiple sclerosis.
 
     Neurocrine is leveraging its resources through strategic alliances and
other financing mechanisms to build its internal product development and
commercialization capabilities. To date, Neurocrine has entered into strategic
alliances with Janssen Pharmaceutica, N.V. ("Janssen"), a subsidiary of Johnson
& Johnson Development Corporation, focused on the treatment of anxiety,
depression and substance abuse; Novartis, Inc. ("Novartis") for the treatment of
multiple sclerosis; and Eli Lilly and Co. ("Lilly") for the treatment of central
nervous system disorders including obesity and dementias such as Alzheimer's
disease. In conjunction with a number of institutional investors, the Company
has also established a research and development affiliate in Canada,
Neuroscience Pharma (NPI) Inc. ("NPI"), to develop additional compounds for the
treatment of Alzheimer's disease and other neurodegenerative diseases and
disorders.
 
     The following Business section contains forward-looking statements
concerning the continuation of the Company's strategic alliances and the receipt
of payments thereunder, the identification of drug targets and selection of lead
compounds for clinical development, the commencement and successful conclusion
of clinical trials, the receipt of regulatory approvals, and the potential
development of future commercial products. Such forward-looking statements
necessarily involve risks and uncertainties. The Company's actual results could
differ materially from those anticipated in these forward-looking statements as
a result of certain factors, including, without limitation, that research
funding and development will continue under the Company's collaborations, that
research and development candidates will successfully proceed through
pre-clinical and early stage clinical trials, that development candidates will
prove effective for treatment in humans in later stage clinical trials, the
timely receipt of regulatory clearances required for clinical testing,
manufacturing and marketing of products, the potential impact of competitive
technologies and potential products, and the failure to achieve product
development and commercialization goals. Actual results and the timing of
certain events could differ materially from those indicated in the
forward-looking statements as a result of these and other factors.
 
RISKS INHERENT IN THE COMPANY'S BUSINESS
 
     Neurocrine was founded in 1992 and all of its product candidates are in
research or early stages of development. The Company has not requested nor
received regulatory approval to commercialize any product from the United Stated
Food and Drug Administration ("FDA") or any other regulatory body. Any products
which may result from the Company's research and development programs are not
expected to be commercially available for the foreseeable future, if at all.
 
     The development of new pharmaceutical products is highly uncertain and
subject to a number of significant risks. Potential products that appear to be
promising at early stages of development may not reach the market for a number
of reasons. Such reasons include the possibilities that the potential products
will be found ineffective or cause harmful side effects during preclinical
testing or clinical trials, fail to receive necessary regulatory approvals, be
difficult to manufacture on a large scale, be uneconomical, fail to achieve
market acceptance or be precluded from commercialization by proprietary rights
of third parties.
 
     The Company's product candidates require significant additional research
and development efforts. No assurance can be given that any of the Company's
development programs will be successfully completed, that any investigational
new drug application ("IND") will be accepted or approved by the FDA, that
clinical trials will commence as planned, that required regulatory approvals
will be obtained on a timely basis, if at all,
 
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or that any products for which approval is obtained will be approved for the
indications requested or be commercially successful. If any of the Company's
development programs are not successfully completed, required regulatory
approvals and appropriate labeling are not obtained, or products for which
approvals are obtained are not commercially successful, the Company's business,
financial condition and results of operations would be materially adversely
affected.
 
BACKGROUND
 
  Corticotropin Releasing Factor ("CRF")
 
     Corticotropin releasing factor, the central regulator of the body's overall
response to stress, affects multiple systems by functioning both as an endocrine
factor and a neurotransmitter. CRF acts as a hormone at the pituitary gland
causing the secretion of the steroid cortisol from the adrenal glands resulting
in a number of metabolic effects, including suppression of the immune system.
CRF also functions as a neurotransmitter in the brain and plays a critical role
in coordinating psychological and behavioral responses to stress such as
increased heart rate, anxiety, arousal and reduced appetite. In addition to
neuroendocrine and neurotransmitter roles, accumulating evidence suggests that
CRF may also integrate actions between the immune and central nervous systems in
response to physiological and psychological stressors.
 
     The body has several mechanisms to regulate the effects of CRF. The
Company's recent cloning of human CRF receptors suggests that the diverse
functions of CRF are mediated through distinct receptor subtypes which are
differentially distributed in specific brain areas and in tissues outside of the
central nervous system. These receptors may offer a mechanism to modulate
specific actions of CRF without affecting the broad range of its activities.
There are several diseases and disorders such as anxiety, depression and
substance abuse in which CRF levels are increased. The deleterious effects of
high levels of CRF may be countered by the administration of selective CRF
receptor antagonists. A protein in the brain that binds to CRF and holds it in
an inactive state, CRF-binding protein ("CRF-BP"), tightly regulates levels of
CRF in certain brain regions. CRF-BP may provide a novel target to selectively
increase levels of CRF in diseases that are associated with decreased levels of
CRF, such as Alzheimer's disease and obesity.
 
  Altered Peptide Ligands
 
     The immune system employs highly specific T-cells that recognize and attack
foreign antigens that invade the body. Occasionally, certain T-cells arise that
inappropriately recognize the body's own tissues as foreign and attack healthy
cells, resulting in autoimmune diseases such as multiple sclerosis and Type I
diabetes. Recently, it has been found that the peptide recognition site on
healthy tissue can be altered, creating molecular decoys that can be developed
as potential drug candidates. The Company believes that these molecules, known
as altered peptide ligands, are capable of binding to and deactivating T-cells
implicated in certain autoimmune diseases.
 
     Multiple sclerosis is a chronic disease caused by the immune system's
attack on myelin, the insulating material that surrounds and protects nerve
fibers in the central nervous system ("CNS"). This autoimmune reaction is led by
T-cells which come in contact with myelin by utilizing T-cell receptors specific
for myelin proteins. This interaction leads to a destructive inflammatory
response mediated by molecules of the immune system known as cytokines.
Cytokines such as gamma interferon, tumor necrosis factor-alpha and
interleukin-6 are found at the site of inflammation and demyelination and play a
role in further advancing nerve cell destruction. The use of altered peptide
ligands of dominant antigens in autoimmune diseases may inactivate certain
T-cells and decrease the production of destructive cytokines.
 
  Neurosteroids
 
     Neurosteroids are a class of steroidal compounds produced in the central
nervous system that show a wide range of effects on neurons.
Dehydroepiandrosterone ("DHEA") is the most abundant adrenal steroid in humans.
Blood levels of this hormone peak by age 20 and then decrease throughout life,
reaching their lowest levels by age 65. DHEA levels have been found to be
decreased in Alzheimer's patients while DHEA has been shown to have
memory-enhancing effects in animal studies. For example, studies have been
performed in aged
 
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mice which perform more poorly than young mice in certain memory tasks.
Administration of DHEA in the older animals has been shown to improve memory to
the high levels seen in the younger animals. DHEA has also been shown to
significantly reverse pharmacologically-induced amnesia and memory impairment in
these animals.
 
     In addition to the memory-enhancing effects of DHEA, preliminary data
suggest that this steroid also increases neuronal survival. DHEA may also induce
neuroprotection through inhibition of inflammatory cytokines in the brain which
have recently been implicated in neurodegeneration. In view of its cognitive
enhancing and neuroprotective potential, DHEA replacement therapy may be
beneficial for the treatment of neurodegenerative disorders such as Alzheimer's
disease.
 
  Neurogenomics
 
     The brain and spinal cord are comprised of two major cell types -- glial
cells and neurons. Glial cells are the most prevalent cell type in the central
nervous system, comprising over 75% of all brain cells. The gene products from
these cells are crucial for the survival and development of neurons. Neurons are
CNS cells which transmit and receive complex electrical and chemical messages
from other neurons to control all cognitive processes. In certain pathological
states, excessive glial activity results in the activation of cytosine and
related genes. The proteins encoded by these genes may be implicated in the
degenerative cascade leading to neurological disorders such as Alzheimer's
disease, stroke, multiple sclerosis, Parkinson's disease, epilepsy and AIDS
dementia. For example, in AIDS, the HIV virus does not attack neurons but does
infect glial cells which in turn release inflammatory cytokines and other
factors which are toxic to neurons. Similarly, in Alzheimer's disease,
accumulating evidence suggests complex interactions between neurons, glia and a
protein fragment known as beta amyloid leading to formation of senile plaques
and neurodegeneration. Currently, it is estimated that only a small fraction of
genes involved in neurodegeneration or regeneration have been identified. The
identification of novel CNS genes involved in the neurodegenerative process may
yield new therapeutic and diagnostic opportunities.
 
BUSINESS STRATEGY
 
     The Company's strategy is to utilize its understanding of the biology of
the central nervous, immune and endocrine systems to identify and develop novel
therapeutics. There are five key elements to the Company's business strategy:
 
     Target Multiple Product Platforms. Neurocrine is focusing on research and
development programs which utilize its distinct biological and technological
competencies. The Company believes certain central nervous system drug targets,
such as CRF, CRF-BP, Insulin-like Growth Factor Binding Protein (IGF-BP) and
neurosteroids, represent significant market opportunities in psychiatric,
neurologic and metabolic disorders. Immunological targets, such as altered
peptide ligands, offer product opportunities related to autoimmune diseases.
Neurogenomics allows the Company to combine its neuroscience and immunology
expertise with new drug discovery technologies to identify novel gene-related
product or gene therapy opportunities.
 
     Identify Novel Neuroscience and Immunology Drug Targets for the Development
of Therapeutics Which Address Large Unmet Market Opportunities. Neurocrine
employs molecular biology as an enabling discipline to identify novel drug
targets such as receptors, genes and gene-related products. The Company uses
advanced technologies, including combinatorial chemistry, high-throughput
screening, gene sequencing and bioinformatics, to discover and develop novel
small molecule therapeutics for diseases and disorders of the central nervous
and immune systems including anxiety, depression, Alzheimer's disease, obesity
and multiple sclerosis.
 
     Leverage Strategic Alliances to Enhance Development and Commercialization
Capabilities. Neurocrine intends to leverage the development, regulatory and
commercialization expertise of its corporate partners to accelerate the
development of its potential products, while retaining full or co-promotion
rights in North America. The Company intends to further leverage its resources
by continuing to enter into strategic alliances and novel financing mechanisms
to enhance its internal development and commercialization capabilities. To
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date, Neurocrine has entered into a strategic alliance with Janssen focusing on
CRF receptor antagonists to treat anxiety, depression, and substance abuse; with
Novartis to develop altered peptide ligands for the treatment of MS; and with
Lilly to collaborate in the discovery, development and commercialization of CRF
binding protein ligand inhibitors for the treatment of central nervous system
disorders including obesity and dementias such as Alzheimer's disease. The
Company has also formed NPI, a research and development subsidiary, to finance
its Neurosteroid clinical development program for Alzheimer's disease and
Neurogenomics programs.
 
     Outsource Capital Intensive and Non-Strategic Activities. Neurocrine
intends to focus its resources on research and development activities by
outsourcing its requirements for manufacturing, preclinical testing, and
clinical monitoring activities. The Company utilizes contract current Good
Manufacturing Processes ("cGMP") manufacturing for both its Neurosteroid and
Altered Peptide Ligand programs. Neurocrine believes that the ease of
manufacturing of small molecule therapeutics will allow the Company to focus on
its core discovery and development programs to generate additional product
opportunities.
 
     Acquire Complementary Products in Clinical Development. Neurocrine plans to
acquire rights to products in various stages of clinical development in the
fields of neurology and immunology to take advantage of the development and
future commercialization capabilities it is developing in cooperation with its
strategic partners. For example, Neurocrine has licensed rights to DHEA for the
treatment of Alzheimer's disease which is currently being evaluated in a
physician investigational new drug application ("physician-IND") Phase II
clinical trial and in a Company-sponsored Phase II/III clinical trial in Canada
under the regulatory authority of the Canadian Health Protection Board ("HPB").
 
TECHNOLOGY
 
     Neurocrine utilizes advanced technologies to enhance its drug discovery
capabilities and to accelerate the drug development process. These technologies
include:
 
     High-Throughput Screening. Neurocrine has assembled a chemical library of
diverse, low molecular weight organic molecules for lead compound
identification. The Company has implemented robotic screening capabilities
linked to its library of compounds that facilitate the rapid identification of
new drug candidates for multiple drug targets. The Company believes that the
utilization of high-throughput screening and medicinal and peptide chemistry
will enable the rapid identification and optimization of lead molecules.
 
     Combinatorial Chemistry. Neurocrine has developed an automated
combinatorial chemistry technology (Rapid Microscale Synthesis or "RMS") which
is capable of rapidly producing large quantities of highly purified small
organic molecules for evaluation as drug candidates. Unlike other combinatorial
chemistry technologies, RMS enables individual chemists to optimize candidate
compounds quickly and efficiently by producing hundreds of variations of
existing lead molecules.
 
     Molecular Biology. Neurocrine scientists have utilized novel techniques for
examination of gene expression in a variety of cellular systems. The Company has
developed a sophisticated technique to evaluate the type and quantity of genes
in various cellular systems prior to the isolation of genes. Neurocrine has also
developed unique expression vectors and cell lines that allow for the highly
efficient protein expression of specific genes.
 
     Gene Sequencing. Neurocrine applies integrated automated DNA sequencing and
gene identification technology in its Neurogenomics program. The systems
utilized by Neurocrine allow for extended gene analysis in a rapid,
high-throughput format with independent linkage into a sequence identification
database. Neurocrine has optimized gene sequencing instrumentation for
"differential display," a technique that may facilitate the rapid identification
of novel genes.
 
     Bioinformatics. Neurocrine's Neurogenomics program creates a significant
amount of genetic sequence information. Applied genomics relies on information
management systems to collect, store and rapidly analyze thousands of gene
sequences. Neurocrine has developed a bioinformatics system which the Company
believes will allow it to identify novel genes which are involved in
neurodegeneration. Data are collected by automated
 
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instruments and stored and analyzed by Neurocrine using customized computational
tools. To date, Neurocrine's molecular biologists have identified over 4,500
novel genes.
 
PRODUCTS UNDER DEVELOPMENT
 
     The following table summarizes Neurocrine's most advanced products in
development. This table is qualified in its entirety by reference to the more
detailed descriptions appearing elsewhere in this Form 10-K.
 
<TABLE>
<CAPTION>
              PROGRAM                     INDICATION                STATUS(1)             COMMERCIAL RIGHTS
              -------                     ----------                ---------             -----------------
<S>                                  <C>                   <C>                           <C>
Corticotropin Releasing Factor
  Receptor Antagonists               Anxiety               Phase I                       Janssen/Neurocrine
                                     Depression            Phase I                       Janssen/Neurocrine
                                     Stroke                Development                   Neurocrine
                                     Substance Abuse       Research                      Janssen/Neurocrine
  Binding Protein Antagonists        Alzheimer's Disease   Development                   Lilly/Neurocrine
                                     Obesity               Development                   Lilly/Neurocrine
 
Altered Peptide Ligands              Multiple Sclerosis    Phase II                      Novartis/Neurocrine
                                     Type I Diabetes       Preclinical                   Neurocrine
 
Neurosteroids                        Alzheimer's Disease   Physician-IND Phase II;       Neurocrine/NPI
                                                           Phase II/III
 
Neurogenomics                        Neurodegenerative     Research                      Neurocrine/NPI
                                     Diseases
</TABLE>
 
- ---------------
(1) "Research" indicates identification and evaluation of compounds in in vitro
    and animal models.
 
    "Development" indicates that lead compounds have been discovered that meet
    certain in vitro and in vivo criteria. These compounds may undergo
    structural modification and more extensive evaluation prior to selection for
    preclinical development.
 
    "Preclinical" indicates that Neurocrine is conducting pharmacology testing,
    toxicology testing, formulation, process development and/or manufacturing,
    and is in the process of preparing an IND for regulatory submission.
 
    "Phase I" indicates that Neurocrine or its collaborative partner is
    conducting clinical trials to determine safety, the maximally tolerated dose
    and pharmacokinetics of the compound in healthy volunteers.
 
    "Physician-IND Phase II" indicates that an independent physician has
    received FDA approval to evaluate one of the Company's products in humans to
    determine safety and efficacy in an expanded patient population. This
    clinical trial is not under full control of the Company.
 
    "Phase II" indicates that the Company has received FDA approval to evaluate
    one of the Company's products in humans to determine safety and efficacy in
    an expanded patient population.
 
    "Phase II/III" indicates that the Company has received regulatory approval
    from the Canadian HPB to evaluate in Canada a multi-center Phase II/III
    clinical trial of DHEA.
 
CORTICOTROPIN RELEASING FACTOR -- RECEPTOR ANTAGONIST PROGRAM
 
  Anxiety
 
     Anxiety is among the most commonly observed group of CNS disorders, which
includes phobias or irrational fears, panic attacks, obsessive-compulsive
disorders and other fear and tension syndromes. Estimates by the National
Institute of Mental Health suggest that the most commonly diagnosed forms of
anxiety disorders may affect 10% of the United States population. Of the
pharmaceutical agents that are currently marketed for the treatment of anxiety
disorders, a class of compounds known as the benzodiazepines, such as Valium, is
the most frequently prescribed. In spite of their therapeutic efficacy, several
side effects limit the utility of these anti-anxiety drugs. Most problematic
among these are drowsiness, ataxia (the inability to stand up), amnesia, drug
dependency and withdrawal reactions following the cessation of therapy.
 
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     Neurocrine is developing a new class of therapeutics that target
stress-induced anxiety. In view of the evidence implicating CRF in
anxiety-related disorders, Neurocrine is developing small molecule CRF receptor
antagonists as anti-anxiety agents which block the effects of overproduction of
CRF. The Company believes that these compounds represent a class of molecules
based on a novel mechanism of action which may offer the advantage of being more
selective, thereby providing increased efficacy with reduced side effects. In
animal studies used to evaluate anti-anxiety drugs, Neurocrine scientists have
demonstrated the efficacy of its lead candidates following oral administration
without evidence of apparent side effects. Neurocrine's corporate partner,
Janssen, selected a drug candidate in 1996 for preclinical testing and commenced
Phase I clinical trials on the drug candidate in late 1997. However, results
obtained in animals are not necessarily predictive of results obtained in man,
and no assurance can be given that the Company's partner will successfully
complete Phase I clinical testing or progress to later clinical trials in a
timely manner, or at all.
 
  Depression
 
     Depression is one of a group of neuropsychiatric disorders that is
characterized by extremes of elation and despair, loss of body weight, decrease
in aggressiveness and sexual behavior, and loss of sleep. This condition is
believed to result from a combination of environmental factors, including
stress, as well as an individual's biochemical vulnerability, which is
genetically predetermined. The biochemical basis of depression is thought to
involve elevated secretion of CRF and abnormally low levels of other
neurotransmitters in the brain such as serotonin. Clinical depression was
reported to affect 6% of the population, or approximately 25 million individuals
in the United States in 1994. Current antidepressant therapies, including
Prozac, increase the levels of several chemicals in the brain, such as
serotonin. Because these drugs affect a wide range of neurotransmitters, they
have been associated with a number of side effects. While newer, more selective
drugs offer some safety improvement, their side effect profiles are still
inadequate due to their unwanted effects on gastrointestinal and sexual
function, and on appetite. Furthermore, most existing antidepressant therapies
are limited by their slow onset of action.
 
     Neurocrine is developing small molecule therapeutics to block the effects
of overproduction of CRF for the treatment of depression. The Company has
developed several CRF receptor antagonists. The Company's corporate partner,
Janssen, selected a drug candidate in 1996 for preclinical testing and commenced
Phase I clinical trials on the drug candidate in late 1997. However, results
obtained in animals are not necessarily predictive of results obtained in man,
and no assurance can be given that the Company's partner will successfully
complete Phase I clinical testing or progress to later clinical trials in a
timely manner, or at all.
 
  Stroke
 
     Stroke is an acute neurologic event caused by blockage or rupture of
vessels which supply blood to the brain. Neuronal damage progresses over a
period of four to six hours. According to the National Institutes of Health
("NIH") estimates, approximately 500,000 patients experience a stroke in the
United States each year, with an approximately equal incidence in the rest of
the world. Stroke results in an estimated 150,000 fatalities each year, making
it the leading cause of death behind heart disease and cancer, and an estimated
additional 150,000 stroke victims suffer permanent neurological damage.
Survivors of stroke are at significantly increased risk of suffering another
episode. Current treatments for stroke consist of surgery, steroid therapy and
anti-platelet therapy. These treatments may help increase blood flow but do not
affect the secondary mechanisms which cause nerve cell death.
 
     Neurocrine believes its CRF receptor antagonist program may have utility in
the treatment of stroke. Preliminary experiments in animal models of stroke show
substantial enhancement of neuronal survival following treatment with a CRF
receptor antagonist. The survival benefit is independent of increased blood flow
and may be acting on secondary mechanisms.
 
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CORTICOTROPIN RELEASING FACTOR -- BINDING PROTEIN ANTAGONIST PROGRAM
 
  Alzheimer's Disease
 
     Alzheimer's disease is a neurodegenerative brain disorder which leads to
progressive memory loss and dementia. Alzheimer's disease generally follows a
predictable course of deterioration over eight years or more, with the earliest
symptom being impairment of short-term memory. Gradually, memory loss increases,
reasoning abilities deteriorate, and individuals become depressed, agitated,
irritable and restless. In the final stages of the disease, patients become
unable to care for themselves. According to the National Alzheimer's
Association, in 1994 over four million individuals in the United States suffered
from Alzheimer's disease. Alzheimer's disease is the fourth leading cause of
death for adults, responsible for over 100,000 deaths in 1994. Marketed
therapies currently available for the treatment of Alzheimer's disease are
severely limited. Tacrine, a therapy which has been recently approved, shows
limited memory improvement in Alzheimer's patients; however, concerns regarding
drug-induced elevations in liver enzymes have limited the widespread use of this
product.
 
     Neurocrine scientists have found that there are significant decreases in
CRF levels in the brain areas that are affected in Alzheimer's disease. In spite
of reduced CRF concentrations, CRF-BP levels are not decreased in areas of the
brain affected by Alzheimer's disease, thereby providing the Company with a
novel target for drug intervention. Consequently, Neurocrine is developing
CRF-BP antagonists to displace CRF from the binding protein and effectively
increase the amount of "free CRF" available to interact with the CRF receptors.
This strategy is expected to selectively raise the concentration of CRF in brain
areas involved in learning and memory processes. Because the therapeutic is
designed to restore normal levels of CRF only in these areas, the Company
believes that the drug will not induce the side effects associated with
administering CRF directly, such as anxiety. The Company has identified a number
of lead compounds which show efficacy following oral administration in animal
models of learning and memory. Efforts are underway to further optimize these
molecules. However, no assurance can be given that the Company and its corporate
partner will successfully identify suitable candidate compounds for development
in a timely manner, or at all.
 
  Obesity
 
     Obesity is the most common nutritional disorder in Western societies. As
many as three in 10 adult Americans weigh at least 20% in excess of their ideal
body weight, with 35 million people in the United States characterized as
clinically obese. Increased body weight is a significant public health problem
because it is associated with a number of serious diseases, including type II
diabetes, hypertension, hyperlipidemia and several cancers. Although obesity has
been commonly considered to be a behavioral problem, there is now evidence that
body weight is physiologically regulated. The regulation of body weight is
complex and appears to consist of both centrally and peripherally acting
mechanisms.
 
     Preliminary data indicate that CRF may act as a central regulator of both
appetite and metabolism. Neurocrine has evaluated CRF-BP antagonists in a
genetically mutant strain of obese animals as well as in animal models which
were pharmacologically induced to overeat. Treatment with CRF-BP antagonists
consistently normalized feeding behavior and weight in both types of models and
did so without inducing excess CRF-related side effects such as anxiety.
Neurocrine has developed several active series of lead molecules. Medicinal
chemistry efforts have resulted in the generation of high-affinity molecules
that show efficacy in elevating brain CRF levels. Neurocrine and its corporate
partner, Lilly, anticipate selecting lead compounds in 1998 for further
development. However, no assurance can be given that the Company and its
corporate partner will successfully identify suitable candidate compounds for
development in a timely manner, or at all. Further, results obtained in animals
are not necessarily predictive of results obtained in humans, and
 
                                        8
<PAGE>   9
 
no assurance can be given that the Company will progress to clinical trials or
successfully complete clinical trials in a timely manner, if at all.
 
ALTERED PEPTIDE LIGAND PROGRAM
 
  Multiple Sclerosis ("MS")
 
     Multiple sclerosis is a chronic immune mediated disease characterized by
recurrent attacks of neurologic dysfunction due to damage in the CNS. The
classic clinical features of MS include impaired vision and weakness or
paralysis of one or more limbs. Patients develop a slow, steady deterioration of
neurologic function over an average duration of approximately 30 years. The
cause of MS is unknown but immunologic or infectious factors have been
implicated. According to the National Multiple Sclerosis Society, there are an
estimated 350,000 cases of multiple sclerosis in the United States and an equal
number of patients in Europe with approximately 20,000 new cases diagnosed in
the world each year. Currently available treatments for MS offer only limited
efficacy. Steroids have been used to reduce the severity of acute flare-ups and
speed recovery. Experimental therapy with other immunosuppressive agents has
been tried, but with limited success. Betaseron (a form of beta-interferon) has
been shown to delay the onset of flare-ups of the symptoms in approximately 30%
of patients and has been approved for marketing by the FDA. In addition, Avonex,
a similar form of beta-interferon, has received FDA approval. Clinical trial
results show these therapies slowed, but did not prevent, the growth of lesions
in the CNS which cause the disease. Patients treated with beta-interferon
experience a variety of side effects, including "flu-like" symptoms.
 
     One of the Company's co-founders, Dr. Lawrence Steinman, identified the
dominant invading T-cell in the brains of patients who had died of MS. Dr.
Steinman further identified the dominant target or recognition site on the
myelin sheath to which invading T-cells bind. Neurocrine has exclusively
licensed this technology and has designed altered peptide ligands which resemble
native disease-causing molecules of the myelin sheath. These molecules have been
altered to attract and bind to disease-causing T-cells and inhibit their
destructive capabilities. Neurocrine's altered peptide ligand for the treatment
of MS has been shown to reverse disease in animal models of MS and decrease the
production of cytokines such as gamma interferon and tumor necrosis factor-alpha
which contribute to the disease. These same molecules demonstrate the ability to
turn off pathogenic T-cells from MS patients in vitro. Quantities of the
Company's drug candidate were produced under cGMP conditions in preparation for
a Phase I clinical trial. Together with Novartis, the Company's collaborative
partner for this program, Neurocrine filed an IND and received approval in 1996
to commence clinical trials. The Company and its corporate partner have
completed Phase I clinical trials and began patient accrual for Phase II
randomized clinical trials in the latter half of 1997. However, results obtained
in animals or in earlier phases of clinical trials are not necessarily
predictive of results obtained in humans, and no assurance can be given that the
Company will successfully complete clinical trials in a timely manner, if at
all.
 
  Type I Diabetes
 
     Type I diabetes, or juvenile-onset diabetes, is an autoimmune disease
resulting from the destruction of insulin producing cells, causing impaired
glucose metabolism resulting from a deficiency in the action of the hormone
insulin. It is one of the most prevalent chronic conditions in the United
States, afflicting approximately 500,000 patients in all age groups in 1994.
Diabetics suffer from a number of complications of the disease including heart
disease, circulatory problems, kidney failure, neurologic disorders and
blindness. Current therapy for type I diabetes consists of daily insulin
injections to regulate blood glucose levels.
 
     Neurocrine is developing altered peptide ligands which target dominant
antigens on insulin producing cells to treat type I diabetes. Pre-diabetic
patients can now be identified using immune markers of the disease several years
before they become insulin dependent. The Company believes that an altered
peptide ligand specific for autoimmune T-cells involved in diabetes may stop the
destruction of the insulin secreting cells in these pre-diabetic patients, thus
allowing them to delay or avoid chronic insulin therapy. The Company believes
that this program can leverage the technological expertise the Company has
developed in its MS program to discover and design altered peptide ligand
therapy useful in treating diabetics and pre-diabetics.
 
                                        9
<PAGE>   10
 
Neurocrine has begun collaborations with a leading diabetes center, the Barbara
Davis Center for Childhood Diabetes at the University of Colorado, to study the
effects of altered peptide ligands on human T-cells from diabetic patients. A
preliminary preclinical candidate was selected in late 1997 and the Company
expects to file an IND or a foreign IND equivalent in Canada or Europe in late
1998. However, no assurance can be given that the Company will conclude
preclinical testing in a timely manner, or at all.
 
NEUROSTEROID PROGRAM
 
  Alzheimer's Disease
 
     Alzheimer's disease is a neurodegenerative brain disorder which leads to
progressive memory loss and dementia. The Company believes that DHEA, a
naturally occurring hormone, may be useful in treatment of this disease based on
a variety of mechanisms. DHEA may protect neurons from death by increasing
growth factor levels in the brain, such as insulin-like growth factor-1. DHEA
also appears to modulate several cytokines involved in inflammation, which are
believed to be involved in the pathology of Alzheimer's disease. In addition,
DHEA improves memory and learning processes in both animal models and humans and
may prove beneficial in slowing the memory loss seen in Alzheimer's disease.
Because DHEA is naturally occurring, it is expected to have few toxicity
problems, which differentiates this drug from other compounds that are currently
being tested as therapeutics for Alzheimer's disease.
 
     A double-blind, placebo-controlled, physician-IND Phase II clinical trial
of DHEA, was conducted in 1997 with investigators from the Alzheimer's Clinic at
the University of California, San Francisco. The trial was designed to determine
efficacy as measured by improving memory in mild to moderate Alzheimer's
patients. Approximately 60 patients were treated for six months with either an
active drug or a placebo. The trial was completed in 1997 and results are
expected in mid-1998. The patients in this study will be evaluated to assess the
progress of disease and retention of memory. However, no assurance can be given
that the results of these clinical trials will be positive, that the Company
will begin its own clinical trials in a timely manner (if at all), or that if
the results are positive, the Company will be able to duplicate such results in
its own Phase II clinical trials.
 
     The Company has obtained regulatory approval and initiated a multi-center
Phase II/III double-blind, placebo-controlled clinical trial of DHEA in Canada,
New Zealand, Australia, South Africa and Europe. This trial has been designed to
determine efficacy as measured by improving memory in mild to moderate
Alzheimer's patients. The study was designed in collaboration with, and will be
conducted by, the Consortium of Canadian Centres for Clinical Cognitive Research
in 18 Canadian Alzheimer's research centers. The clinical trial plans to
evaluate efficacy parameters in 300 patients with a single dose of DHEA vs.
placebo administered twice daily. The Company anticipates that this trial will
be completed by the end of 1998. However, results obtained in earlier clinical
trials are not necessarily predictive of results obtained in later trials, and
no assurance can be given that the Company will successfully complete clinical
trials in a timely manner, or at all. Even if regulatory approval is granted in
Canada, the Company will likely be required to undertake additional clinical
testing to obtain regulatory approval from the FDA for sales in the United
States.
 
NEUROGENOMICS PROGRAM
 
  Neurodegenerative Diseases and Disorders
 
     Neurodegenerative diseases and disorders involve damage to the cellular
structure of the brain either acutely, as in stroke or trauma, or chronically,
as in epilepsy and Alzheimer's disease. To date, only a limited number of
effective therapeutics exist to treat neurological disorders, resulting in
significant economic and social costs. In 1994, over 26 million people in the
United States were affected by neurological disorders.
 
     Activation of glial cells is a common feature of many neurodegenerative
diseases. The primary goal of Neurocrine's Neurogenomics program is to identify
and characterize novel genes that are induced in glial cells under conditions
that lead to neurodegeneration or regeneration. The Company is focusing on
stroke, multiple sclerosis, AIDS dementia, epilepsy, Parkinson's disease and
Alzheimer's disease. The unique conditions leading to neurodegeneration in each
of the disorders have been established in both animal and cellular models of the
disease. Neurocrine is actively isolating and analyzing genes associated with
neuronal cell death
                                       10
<PAGE>   11
 
utilizing state of the art molecular biology, gene sequencing and
bioinformatics. In addition, activated genes which are neuroprotective or allow
for the regeneration of neurons may also be identified.
 
     Novel neurodegenerative genes that are discovered may include proteins,
enzymes or receptors. Protein signaling molecules or the genes encoding such
molecules may be utilized as therapeutics, while enzymes and receptors may serve
as new targets for drug discovery. Neurocrine currently intends to place the
receptors and enzymes encoded by these genes in high-throughput screens in an
attempt to discover small molecule therapeutics to treat neurodegenerative
disorders. To date, the Company has identified more than 4,500 novel genes of
which a number are undergoing biological evaluation in in vitro and animal
models. The Company currently intends to identify candidate genes as drugs or
drug targets for one or more neurological diseases. However, there can be no
assurance that the Company will successfully identify suitable gene candidates
for development in a timely manner, or at all.
 
STRATEGIC ALLIANCES
 
     The Company's business strategy is to utilize strategic alliances and novel
financing mechanisms to enhance its development and commercialization
capabilities. To date, Neurocrine has completed the following alliances:
 
JANSSEN PHARMACEUTICA, N.V.
 
     On January 1, 1995, Neurocrine entered into a research and development
agreement (the "Janssen Agreement") with Janssen to collaborate in the
discovery, development and commercialization of CRF receptor antagonists
focusing on the treatment of anxiety, depression and substance abuse. The
collaboration utilizes Neurocrine's expertise in cloning and characterizing CRF
receptor subtypes, CRF pharmacology and medicinal chemistry. Pursuant to the
Janssen Agreement, the Company has received $2.0 million in license payments. In
connection with the Janssen Agreement, Johnson & Johnson Development Corporation
("JJDC") purchased $5 million of the Company's Common Stock. The collaborative
research portion of the Janssen Agreement was completed as scheduled in 1997
with the selection of a clinical candidate and the commencement of clinical
trials in Europe. The Company will continue to receive milestone payments and
royalties upon the successful continuation of the development portion of the
Janssen Agreement. The Company has received $9.7 million in sponsored research
payments during the term of the Janssen Agreement, of which $3.7 million was
received in 1997.
 
     Under the Janssen Agreement, Neurocrine is entitled to receive up to $10.0
million in milestone payments for the indications of anxiety, depression, and
substance abuse, and up to $9.0 million in milestone payments for other
indications, if certain development milestones are achieved. The Company has
received $3.3 million of milestone payments through December 31, 1997, of which
$1.5 million was received in 1997. The Company has granted Janssen an exclusive
worldwide license to manufacture and market products developed under the Janssen
Agreement. The Company is entitled to receive royalties on product sales
throughout the world. The Company has certain rights to co-promote such products
in North America. Janssen is responsible for funding all clinical development
and marketing activities, including reimbursement to Neurocrine for its
promotional efforts, if any. There can be no assurance that the Company and its
corporate partner will be successful in developing, receiving regulatory
approvals or commercializing any potential products discovered under the Janssen
Agreement. As a result, there can be no assurance that any product development
milestone or royalty payments will be made.
 
NOVARTIS
 
     In January 1996, the Company entered into a binding letter agreement with
Ciba-Geigy (which subsequently became Novartis) to develop altered peptide
ligand therapeutics for the treatment of MS based upon the Company's drug
development candidates and expertise in immunology and protein chemistry. In
December 1996, the Company and Novartis entered into a definitive agreement (the
"Novartis Agreement") incorporating the terms and conditions set forth in the
letter agreement and certain other terms and conditions agreed to by the Company
and Novartis. Novartis paid the Company a $5 million non-refundable fee prior to
 
                                       11
<PAGE>   12
 
executing the Novartis Agreement. In connection with the Novartis Agreement,
Novartis purchased $10.0 million of the Company's Common Stock. Pursuant to the
Novartis Agreement, Novartis is obligated to provide the Company with $3.5
million in research and development funding, plus certain other program
expenses, each year for five years ending on December 31, 2000. In event that no
biological license application ("BLA") has been filed as a result of the
collaboration by December 31, 2000, then Novartis may be obligated to provide
the Company with an additional $2.5 million per year thereafter until a Product
License Application is filed, except in certain circumstances. The Company has
received a total of $15.7 million in license fees and research funding under the
Novartis Agreement (including the $5.0 million non-refundable fee), of which
$7.2 million was received in 1997. Neurocrine is also entitled to receive
milestone payments if certain research, development and regulatory milestones
are achieved. Milestone payments were $3.8 million and $3.0 million for 1997 and
1996, respectively. Novartis has the right to terminate the Novartis Agreement
on six months' notice which may be given at any time after December 30, 1997.
 
     The Company has granted Novartis an exclusive license outside of the United
States and Canada to market altered peptide ligand products developed under the
Novartis Agreement for multiple sclerosis. The Novartis Agreement provides that
the Company and Novartis will collaborate in the marketing of products developed
under the Novartis Agreement in the United States and Canada. The Company has
the option to discontinue the collaborative marketing effort in the United
States and Canada, in which case Novartis will have exclusive marketing rights
in such territory. Neurocrine is entitled to receive royalties on product sales.
 
     Neurocrine is entitled to receive a share of the profits resulting from
sales of altered peptide ligand products in North America subject to the
recoupment of a portion of Novartis's development costs. Neurocrine retains the
right to convert its profit share to the right to receive royalty payments at
its sole discretion in which case no repayment of development costs are due to
Novartis. Neurocrine is obligated to repay a portion of the development costs of
any potential product developed pursuant to the collaboration unless the Company
elects to convert to the right to receive royalty payments. There can be no
assurance that the Company and Novartis will be successful in developing or
commercializing any potential products. As a result, there can be no assurance
that any product development milestone, royalty, or profit sharing payments will
be made.
 
ELI LILLY AND CO.
 
     On October 15, 1996, Neurocrine entered into a research and license
agreement (the "Lilly Agreement") with Lilly to collaborate in the discovery,
development and commercialization of CRF binding protein ligand inhibitors for
the treatment of central nervous system disorders including obesity and
dementias such as Alzheimer's disease. Neurocrine has received $10.4 million in
research payments under the Lilly Agreement, of which $9.1 million was received
in 1997. Neurocrine expects to receive an additional $11.6 million in research
payments between January 1, 1998 and October 15, 1999, as well as additional
sponsored research payments over the subsequent two-year period if certain
milestones are met, and up to an additional $49.0 million in milestone payments
for the first two products for dementia or obesity if certain development and
regulatory milestones are achieved. The Company has granted Lilly an exclusive
worldwide license to manufacture and market CRF binding protein ligand inhibitor
products. Lilly is obligated to fund clinical development and marketing expenses
(except as set forth below) and is responsible for clinical development,
regulatory compliance, and manufacturing of products. Neurocrine is entitled to
royalties on product sales. At its option, Neurocrine is entitled to receive a
portion of the profits resulting from sales of products for the treatment of
dementia in the United States subject to the Company's obligation to pay a
portion of the development costs for such product. Lilly has agreed to provide
the Company with access to a portion of its chemical compound library for
screening against targets outside of the field of the Lilly Agreement and other
Lilly program areas, subject to the Company's obligation to pay Lilly royalties
on sales of products developed based on compounds in such library and milestone
payments based upon certain development and regulatory milestones for such
products. There can be no assurance that the Company's research under the Lilly
Agreement will be successful in discovering any potential products or that Lilly
will be successful in developing, receiving regulatory approvals, or
commercializing any potential products that may be discovered.
 
                                       12
<PAGE>   13
 
As a result there can be no assurance that any product development milestone,
royalty, or profit sharing payments will be made.
 
NEUROSCIENCE PHARMA INC.
 
     In March 1996, Neurocrine formed Neuroscience Pharma (NPI) Inc. ("NPI"), a
research and development company. Neurocrine licensed to NPI certain technology
and Canadian marketing rights to the Company's Neurosteroid and Neurogenomics
programs in exchange for 49% of the outstanding Common Stock of NPI. A group of
Canadian institutional investors have invested approximately $9.5 million in NPI
in exchange for Preferred Stock of NPI, which may be exchanged for an aggregate
of approximately 1,279,758 shares of Common Stock of the Company. In December
1997, certain of such Canadian institutional investors exercised their right to
exchange an aggregate of 610,000 shares of NPI Preferred Stock for warrants
exercisable for an aggregate of 600,502 shares of Common Stock of the Company.
In December 1997, such Canadian institutional investors exercised the warrants
for 600,502 shares of Common Stock of the Company. Pursuant to a Research and
Development Agreement with a wholly owned subsidiary of the Company, NPI has
committed to expend an aggregate amount of $9.5 million for clinical development
of the Neurosteroid program for Alzheimer's disease and for research activities
related to the Neurogenomics program. Pursuant to such Research and Development
Agreement, NPI is entitled to receive royalties on sales of products developed
in these programs as well as exclusive Canadian marketing rights for such
products in the event that the Company has not terminated the technology license
and the marketing rights or that the investors have not exchanged their NPI
Preferred Stock for shares of the Company's Common Stock. In connection with
their initial investment in NPI, such investors also received warrants
exercisable for 383,875 shares of the Company's Common Stock and are eligible to
receive additional warrants in the future in the event that NPI receives certain
Canadian government incentives for research activities.
 
DEPENDENCE ON STRATEGIC ALLIANCES
 
     The Company is dependent upon its corporate partners to provide adequate
funding for certain of its programs. Under these arrangements, the Company's
corporate partners are responsible for (i) selecting compounds for subsequent
development as drug candidates, (ii) conducting preclinical testing and clinical
trials and obtaining required regulatory approvals for such drug candidates,
and/or (iii) manufacturing and commercializing any resulting drugs. Failure of
these partners to select a compound discovered by the Company for subsequent
development into marketable products, gain the requisite regulatory approvals or
successfully commercialize products would have a material adverse effect on the
Company's business, financial condition and results of operations. The Company's
strategy for development and commercialization of certain of its products is
dependent upon entering into additional arrangements with research
collaborators, corporate partners and others, and upon the subsequent success of
these third parties in performing their obligations. There can be no assurance
that the Company will be able to enter into additional strategic alliances on
terms favorable to the Company, or at all. Failure of the Company to enter into
additional strategic alliances would have a material adverse effect on the
Company's business, financial condition and results of operations.
 
     The Company cannot control the amount and timing of resources which its
corporate partners devote to the Company's programs or potential products. If
any of the Company's corporate partners breach or terminate their agreements
with the Company or otherwise fail to conduct their collaborative activities in
a timely manner, the preclinical testing, clinical development or
commercialization of product candidates will be delayed, and the Company will be
required to devote additional resources to product development and
commercialization, or terminate certain development programs. The Company's
strategic alliances with Janssen, Novartis and Lilly are subject to termination
by Janssen, Novartis, or Lilly, respectively. There can be no assurance that
Janssen, Novartis, or Lilly will not elect to terminate its strategic alliance
with the Company prior to its scheduled expiration. In addition, if the
Company's corporate partners effect a merger with a third party, there can be no
assurance that the strategic alliances will not be terminated or otherwise
materially adversely affected. Ciba-Geigy Ltd. recently completed a merger with
Sandoz Ltd., another major pharmaceutical company, becoming Novartis. The
termination of any current or future strategic alliances
 
                                       13
<PAGE>   14
 
could have a material adverse effect on the Company's business, financial
condition and results of operations. Neurocrine's corporate partners may
develop, either alone or with others, products that compete with the development
and marketing of the Company's products. Competing products, either developed by
the corporate partners or to which the corporate partners have rights, may
result in their withdrawal of support with respect to all or a portion of the
Company's technology, which would have a material adverse effect on the
Company's business, financial condition and results of operations. There can be
no assurance that disputes will not arise in the future with respect to the
ownership of rights to any products or technology developed with corporate
partners. These and other possible disagreements between corporate partners and
the Company could lead to delays in the collaborative research, development or
commercialization of certain product candidates or could require or result in
litigation or arbitration, which would be time-consuming and expensive, and
would have a material adverse effect on the Company's business, financial
condition and results of operations.
 
MANUFACTURING
 
     The Company has in the past utilized, and intends to continue to utilize,
third-party manufacturing for the production of material for use in clinical
trials and for the potential commercialization of future products. The Company
has no experience in manufacturing products for commercial purposes and does not
have any manufacturing facilities. Consequently, the Company is solely dependent
on contract manufacturers for all production of products for development and
commercial purposes. In the event that the Company is unable to obtain or retain
third-party manufacturing, it will not be able to commercialize its products as
planned. The manufacture of the Company's products for clinical trials and
commercial purposes is subject to cGMP regulations promulgated by the FDA. No
assurance can be given that the Company's third-party manufacturers will comply
with cGMP regulations or other regulatory requirements now or in the future. The
Company's current dependence upon third parties for the manufacture of its
products may adversely affect its profit margin, if any, on the sale of future
products and the Company's ability to develop and deliver products on a timely
and competitive basis.
 
MARKETING, SALES, AND PHARMACEUTICAL PRICING ISSUES
 
     Neurocrine has retained certain marketing or co-promotion rights in North
America to its products under development, and plans to establish its own North
American marketing and sales organization. The Company currently has no
experience in marketing or selling pharmaceutical products and does not have a
marketing and sales staff. In order to achieve commercial success for any
product candidate approved by the FDA, Neurocrine must either develop a
marketing and sales force or enter into arrangements with third parties to
market and sell its products. There can be no assurance that Neurocrine will
successfully develop such experience or that it will be able to enter into
marketing and sales agreements with others on acceptable terms, if at all. If
the Company develops its own marketing and sales capabilities, it will compete
with other companies that currently have experienced and well funded marketing
and sales operations. To the extent that the Company enters into co-promotion or
other marketing and sales arrangements with other companies, any revenues to be
received by Neurocrine will be dependent on the efforts of others, and there can
be no assurance that such efforts will be successful.
 
     The Company's business may be materially adversely affected by the
continuing efforts of government and third-party payers to contain or reduce the
costs of health care through various means. For example, in certain foreign
markets, pricing or profitability of prescription pharmaceuticals is subject to
government control. In the United States, there have been, and the Company
expects that there will continue to be, a number of federal and state proposals
to implement similar government control in such jurisdictions. In addition, an
increasing emphasis on managed care in the United States has put, and will
continue to put, pressure on pharmaceutical pricing. Such initiatives and
proposals, if adopted, could decrease the price that the Company receives for
any products it may develop and sell in the future, and thereby have a material
adverse effect on the Company's business, financial condition and results of
operations. Further, to the extent that such proposals or initiatives have a
material adverse effect on other pharmaceutical companies that are
 
                                       14
<PAGE>   15
 
corporate partners or prospective corporate partners for certain of the
Company's potential products, the Company's ability to commercialize its
potential products may be materially adversely affected.
 
     The Company's ability to commercialize pharmaceutical products may depend
in part on the extent to which reimbursement for the costs of such products and
related treatments will be available from government health administration
authorities, private health insurers and other third-party payers. Significant
uncertainty exists as to the reimbursement status of newly approved health care
products, and third-party payers are increasingly challenging the prices charged
for medical products and services. There can be no assurance that any
third-party insurance coverage will be available to patients for any products
developed by the Company. Government and other third-party payors are
increasingly attempting to contain health care costs by limiting both coverage
and the level of reimbursement for new therapeutic products, and by refusing, in
some cases, to provide coverage for uses of approved products for disease
indications for which the FDA has not granted marketing approval. If adequate
coverage and reimbursement levels are not provided by government and third-party
payors for the Company's products, the market acceptance of these products would
be materially adversely affected.
 
COMPETITION
 
     The biotechnology and pharmaceutical industries are subject to rapid and
intense technological change. The Company faces, and will continue to face,
competition in the development and marketing of its product candidates from
academic institutions, government agencies, research institutions and
biotechnology and pharmaceutical companies. Competition may arise from other
drug development technologies, methods of preventing or reducing the incidence
of disease, including vaccines, and new small molecule or other classes of
therapeutic agents. There can be no assurance that developments by others will
not render the Company's product candidates or technologies obsolete or
noncompetitive.
 
     Betaseron and Avonex, similar forms of beta-interferon marketed by Berlex
BioSciences and Biogen, Inc., respectively, and Capoxen, a peptide polymer
marketed by Teva, have been approved for the marketing in the United States and
certain other countries for the treatment of relapsing remitting multiple
sclerosis. Tacrine, marketed by Warner-Lambert Co., and Aricept, marketed by
Pfizer Inc, have been approved for the treatment of Alzheimer's dementia. Sales
of these drugs may reduce the available market for any product developed by the
Company for these indications. The Company is developing products for the
treatment of anxiety disorders, which will compete with well-established
products in the benzodiazepene class, including Valium, marketed by Hoffman-La
Roche, Inc., and depression, which will compete with well-established products
in the anti-depressant class, including Prozac, marketed by Eli Lilly & Co.
Certain technologies under development by other pharmaceutical companies could
result in treatments for these and other diseases and disorders being pursued by
the Company. For example, a number of companies are conducting research on
molecules to block CRF to treat anxiety and depression. Other biotechnology and
pharmaceutical companies are developing compounds to treat obesity. In the event
that one or more of these products and/or programs are successful, the market
for the Company's products may be reduced or eliminated.
 
     In addition, if Neurocrine receives regulatory approvals for its products,
manufacturing efficiency and marketing capabilities are likely to be significant
competitive factors. At the present time, Neurocrine has no commercial
manufacturing capability, sales force or marketing experience. In addition, many
of the Company's competitors and potential competitors have substantially
greater capital resources, research and development resources, manufacturing and
marketing experience and production facilities than does Neurocrine. Many of
these competitors also have significantly greater experience than does
Neurocrine in undertaking preclinical testing and clinical trials of new
pharmaceutical products and obtaining FDA and other regulatory approvals.
 
PATENTS AND PROPRIETARY RIGHTS
 
     The Company files patent applications both in the United States and in
foreign countries, as it deems appropriate, for protection of its proprietary
technology and products. As of December 31, 1997, only one patent has been
issued to the Company; however, the Company otherwise owns or has received
exclusive
 
                                       15
<PAGE>   16
 
licenses to four issued patents. The Company owns or has exclusive rights to a
total of approximately 120 patent applications pursuant to license agreements
with academic and research institutions, including the Beckman Research
Institute of the City of Hope, the Salk Institute for Biological Studies, and
Leland Stanford Junior University. The Company intends to file additional United
States and foreign applications in the future as appropriate.
 
     The Company's success will depend on its ability to obtain patent
protection for its products, preserve its trade secrets, prevent third parties
from infringing upon its proprietary rights, and operate without infringing upon
the proprietary rights of others, both in the United States and internationally.
 
     Because of the substantial length of time and expense associated with
bringing new products through the development and regulatory approval processes
in order to reach the marketplace, the pharmaceutical industry places
considerable importance on obtaining patent and trade secret protection for new
technologies, products and processes. Accordingly, the Company intends to seek
patent protection for its proprietary technology and compounds. There can be no
assurance as to the success or timeliness in obtaining any such patents, that
the breadth of claims obtained, if any, will provide adequate protection of the
Company's proprietary technology or compounds, or that the Company will be able
to adequately enforce any such claims to protect its proprietary technology and
compounds. Since patent applications in the United States are confidential until
the patents issue, and publication of discoveries in the scientific or patent
literature tend to lag behind actual discoveries by several months, the Company
cannot be certain that it was the first creator of inventions covered by pending
patent applications or that it was the first to file patent applications for
such inventions.
 
     The degree of patent protection afforded to pharmaceutical inventions is
uncertain and any patents which may issue with regard to the Company's potential
products will be subject to this uncertainty. There can be no assurance that
competitors will not develop competitive products outside the protection that
may be afforded by the claims of the Company's patents. For example, the Company
is aware that other parties have been issued patents and have filed patent
applications in the United States and foreign countries which claim alternative
uses of DHEA, a potential product of the Company, and cover other therapeutics
for the treatment of multiple sclerosis. DHEA is not a novel compound and is not
covered by a composition of matter patent. The issued patents licensed to the
Company covering DHEA are use patents containing claims covering therapeutic
methods and the use of specific compounds and classes of compounds for
neuroregeneration. Other potential products which the Company may develop may
not consist of novel compounds and therefore would not be covered by composition
of matter patent claims. Competitors may be able to commercialize DHEA products
for indications outside of the protection provided by the claims of any use
patents that may be issued to the Company. In this case, physicians, pharmacies
and wholesalers could then substitute a competitor's product for the Company's
product. Use patents may be unavailable or may afford a lesser degree of
protection in certain foreign countries due to the patent laws of such
countries.
 
     The Company may be required to obtain licenses to patents or proprietary
rights of others. As the biotechnology industry expands and more patents are
issued, the risk increases that the Company's potential products may give rise
to claims that such products infringe the patent rights of others. At least one
patent containing claims covering compositions of matter consisting of certain
altered peptide ligand therapeutics for use in modulating the immune response
has issued in Europe, and the Company believes that this patent has been
licensed to a competitor of the Company. There can be no assurance that a patent
containing corresponding claims will not issue in the United States. In
addition, there can be no assurance that the claims of the European patent or
any corresponding claims of any future United States patents or other foreign
patents which may issue will not be infringed by the manufacture, use or sale of
any potential altered peptide ligand therapeutics developed by the Company or
Novartis. Furthermore, there can be no assurance that the Company or Novartis
would prevail in any legal action seeking damages or injunctive relief for
infringement of any patent that might issue under such applications or that any
license required under any such patent would be made available or, if available,
would be available on acceptable terms. Failure to obtain a required license
could prevent the Company and Novartis from commercializing any altered peptide
ligand products which they may develop.
 
                                       16
<PAGE>   17
 
     No assurance can be given that any licenses required under any patents or
proprietary rights of third parties would be made available on terms acceptable
to the Company, or at all. If the Company does not obtain such licenses, it
could encounter delays in product introductions while it attempts to design
around such patents, or could find that the development, manufacture or sale of
products requiring such licenses could be foreclosed. Litigation may be
necessary to defend against or assert such claims of infringement, to enforce
patents issued to the Company, to protect trade secrets or know-how owned by the
Company, or to determine the scope and validity of the proprietary rights of
others. In addition, interference proceedings declared by the United States
Patent and Trademark Office may be necessary to determine the priority of
inventions with respect to patent applications of the Company or its licensors.
Litigation or interference proceedings could result in substantial costs to and
diversion of effort by, and may have a material adverse impact on, the Company.
In addition, there can be no assurance that these efforts by the Company would
be successful.
 
     The Company also relies upon unpatented trade secrets and improvements,
unpatented know-how and continuing technological innovation to develop and
maintain its competitive position, which it seeks to protect, in part, by
confidentiality agreements with its commercial partners, collaborators,
employees and consultants. The Company also has invention or patent assignment
agreements with its employees and certain, but not all, commercial partners and
consultants. There can be no assurance that relevant inventions will not be
developed by a person not bound by an invention assignment agreement. There can
be no assurance that binding agreements will not be breached, that the Company
would have adequate remedies for any breach, or that the Company's trade secrets
will not otherwise become known or be independently discovered by competitors.
 
     As is commonplace in the biotechnology industry, the Company employs
individuals who were previously employed at other biotechnology or
pharmaceutical companies, including competitors or potential competitors of the
Company. To the extent such Company employees are involved in research areas at
the Company which are similar to those areas in which they were involved at
their former employer, the Company may be subject to claims that such employees
and/or the Company have inadvertently or otherwise used or disclosed the alleged
trade secrets or other proprietary information of the former employers.
Litigation may be necessary to defend against such claims, which could result in
substantial costs and be a distraction to management, and which may have a
material adverse effect on the Company, even if the Company were successful in
defending such claims.
 
GOVERNMENT REGULATION
 
     Regulation by government authorities in the United States and foreign
countries is a significant factor in the development, manufacture and marketing
of the Company's proposed products and in its ongoing research and product
development activities. All of the Company's products will require regulatory
approval by government agencies prior to commercialization. In particular, human
therapeutic products are subject to rigorous preclinical testing and clinical
trials and other approval procedures of the FDA and similar regulatory
authorities in foreign countries. Various federal and state statutes and
regulations also govern or influence testing, manufacturing, safety, labeling,
storage and record-keeping related to such products and their marketing. The
process of obtaining these approvals and the subsequent substantial compliance
with appropriate federal and state statutes and regulations require the
expenditure of substantial time and financial resources. Any failure by the
Company or its collaborators or licensees to obtain, or any delay in obtaining
or maintaining, regulatory approval could adversely affect the marketing of any
products developed by the Company, its ability to receive product or royalty
revenues and its liquidity and capital resources.
 
     Preclinical testing is generally conducted in laboratory animals to
evaluate the potential safety and the efficacy of a product. The results of
these studies are submitted to the FDA as a part of an IND, which must be
approved before clinical trials in humans can begin. Typically, clinical
evaluation involves a time consuming and costly three-phase process. In Phase I,
clinical trials are conducted with a small number of subjects to determine the
early safety profile, the pattern of drug distribution and metabolism. In Phase
II, clinical trials are conducted with groups of patients afflicted with a
specific disease in order to determine preliminary efficacy, optimal dosages and
expanded evidence of safety. In Phase III, large-scale, multi-center,
comparative trials are conducted with patients afflicted with a target disease
in order to provide enough data to demonstrate with substantial evidence the
efficacy and safety required by the FDA. The FDA closely monitors
                                       17
<PAGE>   18
 
the progress of each of the three phases of clinical trials and may, at its
discretion, re-evaluate, alter, suspend or terminate the testing based upon the
data which have been accumulated to that point and its assessment of the
risk/benefit ratio to the patient.
 
     A physician-IND is an IND that allows a physician to conduct a clinical
trial under less rigorous regulatory review standards. A physician-IND clinical
trial does not replace the need for Company-sponsored clinical trials, but can
provide a preliminary indication as to whether further clinical trials are
warranted and may sometimes facilitate the more formal regulatory review
process.
 
     The results of preclinical testing and clinical trials are submitted to the
FDA in the form of an NDA or BLA for approval to commence commercial sales. In
responding to an NDA or BLA, the FDA may grant marketing approval, request
additional information or deny the application if the FDA determines that the
application does not satisfy its regulatory approval criteria. There can be no
assurance that approvals will be granted on a timely basis (or at all). If
approved, there can be no assurance that such approval will include acceptable
labeling to adequately commercialize the product. Similar regulatory procedures
must also be complied with in countries outside the United States.
 
     To date, the Company or its collaborators have submitted two IND
applications in the United States and Canada with regard to its product
candidates and has commenced clinical trials with regard to two potential
products. A physician-IND Phase II clinical trial was initiated in March 1996
with regard to the use of DHEA for the treatment of Alzheimer's disease.
However, such clinical trials are not under the full control of the Company. A
multi-center Phase II/III clinical trial was initiated in Canada in early 1997
with respect to the same potential product under the regulatory authority of the
Canadian HPB. However, a physician-IND clinical trial does not replace the need
for Company-sponsored clinical trials. Even if Canadian regulatory approval is
obtained, the Company will be required to undertake additional clinical testing
to obtain FDA regulatory approval in the United States. No assurance can be
given that the Company will be able to obtain FDA or other governmental
regulatory approval for any products.
 
     In late 1997, the Company's corporate partner, Janssen, initiated Phase I
clinical trials on a CRF receptor antagonist for anxiety and depression,
representing the Company's first CRF product to enter clinical trials. However,
results obtained in animals are not necessarily predictive of results obtained
in man, and no assurance can be given that the Company's partner will
successfully complete Phase I clinical testing or progress to later clinical
trials in a timely manner, or at all.
 
     The results from preclinical testing and early clinical trials may not be
predictive of results obtained in later clinical trials, and there can be no
assurance that clinical trials conducted by the Company or its corporate
partners will demonstrate sufficient safety and efficacy to obtain the requisite
regulatory approvals or will result in marketable products or marketable
indications. In addition, late stage clinical trials are often conducted with
patients having the most advanced stages of disease. During the course of
treatment, these patients can die or suffer other adverse medical effects for
reasons that may not be related to the pharmaceutical agent being tested but
which can nevertheless adversely affect clinical trial results. A number of
companies in the biotechnology and pharmaceutical industries have suffered
significant setbacks in advanced clinical trials, even after promising results
in earlier trials. If the Company's drug candidates are not shown to be safe and
effective in clinical trials, the resulting delays in developing other compounds
and conducting related preclinical testing and clinical trials, as well as the
potential need for additional financing, would have a material adverse effect on
the Company's business, financial condition and results of operations.
 
     The rate of completion of clinical trials conducted by the Company or its
corporate partners may be delayed by many factors, including slower than
expected patient recruitment or unforeseen safety issues. Any delays in, or
termination of, the Company's clinical trials would have a material adverse
effect on the Company's business, financial condition and results of operations.
There can be no assurance that Neurocrine will be permitted by regulatory
authorities to undertake clinical trials for its products or, if such trials are
conducted, that any of the Company's product candidates will prove to be safe
and efficacious or will receive regulatory approvals.
 
     The Company is required to conduct its research activities in compliance
with good laboratory practice regulations enforced by FDA. The Company is also
subject to various Federal, state and local laws, regulations and
recommendations relating to safe working conditions, laboratory manufacturing
practices, and the use and
                                       18
<PAGE>   19
 
disposal of hazardous or potentially hazardous substances, including radioactive
compounds and infectious disease agents, used in connection with the Company's
research. The extent of government regulation which might result from future
legislation or administrative action cannot be predicted accurately.
 
SCIENTIFIC ADVISORY BOARD
 
     Neurocrine has assembled a Scientific Advisory Board that currently
consists of 16 individuals. Members of the Scientific Advisory Board are leaders
in the fields of neurobiology, immunology, endocrinology, psychiatry and
medicinal chemistry. Scientific Advisory Board members meet as a group at least
yearly to advise the Company in the selection, implementation and prioritization
of its research programs. Certain members meet more frequently to advise the
Company with regard to its specific programs.
 
     The Scientific Advisory Board presently consists of the following
individuals:
 
     Floyd E. Bloom, M.D., is Chairman of the Department of Neuropharmacology at
The Scripps Research Institute. Dr. Bloom is an internationally recognized
expert in the fields of neuropharmacology and neurobiology. He is the current
editor of the journal, Science.
 
     Michael Brownstein, M.D., Ph.D., is Chief of the Laboratory of Cell Biology
at the National Institute of Mental Health. He is a recognized expert in
molecular pharmacology as it applies to the field of neuroendocrinology, where
he has defined many of the pharmaceutically important neurotransmitter receptors
and transporter systems.
 
     Iain Campbell, Ph.D., is an Associate Member of the Department of
Neuropharmacology at The Scripps Research Institute. Dr. Campbell is an expert
in cytosine activation in autoimmune diseases and neuronal degeneration.
 
     George P. Chrousos, M.D., Sc.D., is Chief of the Pediatric Endocrinology
Section at the National Institute of Child Health and Human Development. He has
investigated the role of stress hormones in pathological conditions such as
Cushing's disease, anxiety-related disorders and rheumatoid arthritis.
 
     Caleb E. Finch, Ph.D., is the Arco and William F. Kieschnick Professor of
Neurobiology of Aging at the University of Southern California. He is an
internationally recognized expert in the field of molecular gerontology and the
genomic control of mammalian development and aging. His recent work has focused
on the role of cytokines in neuronal protection and aging.
 
     Stephen M. Hedrick, Ph.D., is Professor and Chairman of Cell Biology at the
University of California, San Diego. Dr. Hedrick is an expert in T-cell
immunology and co-discovered the first T-cell receptor genes and identified the
regions responsible for antigen binding. He is an editor for the Journal of
Immunology.
 
     Florian Holsboer, M.D., Ph.D., is Director at the Max Planck Institute fur
Psychiatrie. Dr. Holsboer is an international expert on the role of
glucocorticoids and neuropeptides, particularly CRF, in neuropsychiatric
disorders. He coordinates the efforts of several hundred scientists and
clinicians at the Max Planck Institute, a major European neuropsychiatric
institute.
 
     George F. Koob, Ph.D., is a Member of the Department of Neuropharmacology
at The Scripps Research Institute and an Adjunct Professor in the Departments of
Psychology and Psychiatry at the University of California, San Diego. Dr. Koob
is an internationally recognized behavioral pharmacology expert on the role of
peptides in the central nervous system, the neurochemical basis of addiction and
in the development of preclinical behavioral procedures for the screening of
anxiolytic and antidepressant drugs and memory enhancers.
 
     Phillip J. Lowry, Ph.D., is Professor and Head of the Department of
Biochemistry and Physiology at the University of Reading in Great Britain. Dr.
Lowry is an internationally recognized biochemical endocrinologist whose work
has focused on the purification and characterization of some of the key hormonal
mediators of the endocrine response to stress. Dr. Lowry is a member of the
European Neuroscience Steering Committee, the European Neuroendocrine
Association and the Committee of British Endocrinology.
 
                                       19
<PAGE>   20
 
     Joseph B. Martin, M.D., Ph.D., is Chancellor and Professor of Neurology at
the University of California, San Francisco. Dr. Martin is an internationally
recognized expert in clinical and basic research in neurology and
neuroendocrinology and the etiology of hypothalamic diseases, and was one of the
first neurologists to embrace the role of the central nervous system on immune
function.
 
     Bruce S. McEwen, Ph.D., is Professor and Head of the Harold and Margaret
Milliken Hatch Laboratory of Neuroendocrinology at The Rockefeller University.
Dr. McEwen has identified and studied the function of intracellular receptors
for neuroactive steroid hormones in the brain and immune system, in relation to
stress and sex differences. Dr. McEwen is also President of the Society for
Neuroscience.
 
     Charles B. Nemeroff, M.D., Ph.D., is Chairman and Professor of the
Department of Psychiatry and Behavioral Sciences at Emory University School of
Medicine. Dr. Nemeroff is an internationally recognized expert on the effects of
neuropeptides on behavior and their relevance in clinically important conditions
such as depression, anxiety and schizophrenia, and has published over 400
articles on this subject.
 
     Lawrence J. Steinman, M.D., is Chief Scientist, Neuroimmunology of the
Company and a member of Neurocrine's Founding Board of Scientific and Medical
Advisors and its Executive Committee. See "Item 10 -- Executive Officers and
Directors of the Registrant."
 
     Wylie W. Vale, Ph.D., is Chief Scientist, Neuroendocrinology of the Company
and a member of Neurocrine's Founding Board of Scientific and Medical Advisors
and its Executive Committee. See "Item 10 -- Executive Officers and Directors of
the Registrant."
 
     Stanley J. Watson, Jr., M.D., Ph.D., is Professor and Associate Chair for
Research in the Department of Psychiatry and Co-Director of the Mental Health
Research Institute at the University of Michigan. Dr. Watson is a recognized
expert in neuropeptides and their receptors and their role in psychiatric
diseases and behavior. Dr. Watson is also a member of the Institute of Medicine
of the National Academy of Sciences.
 
     Each of the members of the Scientific Advisory Board have signed consulting
agreements that contain confidentiality provisions and restrict the members of
the Scientific Advisory Board from competing with the Company for the term of
the agreement. Each member of the Scientific Advisory Board receives either a
per diem consulting fee or a retainer fee and is anticipated to provide at least
five days of consulting per year. Each member also has received stock or stock
options in the Company, which vest over time. All but one member of the
Scientific Advisory Board is a full-time employee of a university or research
institute that has regulations and policies which limit the ability of such
personnel to act as part-time consultants or in other capacities for any
commercial enterprise, including the Company. A change in these regulations or
policies could adversely affect the relationship of the Scientific Advisory
Board member with the Company.
 
INSURANCE
 
     The Company maintains product liability insurance for clinical trials in
the amount of $5.0 million per occurrence and $5.0 million in the aggregate. The
Company intends to expand its insurance coverage to include the sale of
commercial products if marketing approval is obtained for products in
development. However, insurance coverage is becoming increasingly expensive, and
no assurance can be given that the Company will be able to maintain insurance
coverage at a reasonable cost or in sufficient amounts to protect the Company
against losses due to liability. There can also be no assurance that the Company
will be able to obtain commercially reasonable product liability insurance for
any products approved for marketing. A successful product liability claim or
series of claims brought against the Company could have a material adverse
effect on its business, financial condition and results of operations.
 
EMPLOYEES
 
     As of December 31, 1997, the Company had 108 employees, consisting of 92
full-time and 16 part-time employees. Of the full-time employees, 39 hold Ph.D.,
M.D., or equivalent degrees. None of the Company's employees are represented by
a collective bargaining arrangement, and the Company believes its relationship
with its employees is good. The Company is highly dependent on the principal
members of its management and scientific staff. The loss of services of any of
these personnel could impede the achievement of the Company's development
objectives. Furthermore, recruiting and retaining qualified scientific personnel
to
                                       20
<PAGE>   21
 
perform research and development work in the future will also be critical to the
Company's success. There can be no assurance that the Company will be able to
attract and retain personnel on acceptable terms given the competition among
biotechnology, pharmaceutical and health care companies, universities and
non-profit research institutions for experienced scientists. In addition, the
Company relies on members of its Scientific Advisory Board and a significant
number of consultants to assist the Company in formulating its research and
development strategy.
 
ITEM 2. PROPERTIES
 
     The Company leases approximately 48,000 square feet of corporate and
laboratory facilities at 3050 Science Park Road, San Diego, California. The
lease extends through 2006. The Company has sublet 19,000 square feet of this
facility to a third party for up to four years. The Company has also leased an
additional 2,000 square-foot animal facility for a term of two years. The
Company believes that its facilities will be adequate to meet its research and
development needs through 1998.
 
     In May 1997, the Company purchased two adjacent parcels of land in San
Diego for approximately $5.0 million in cash. The Company sold one parcel to a
third party in 1997, but expects to repurchase the land and lease the parcel to
Science Park Center LLC, a California limited liability company (the "LLC"), of
which the Company owns a minority interest. The LLC will construct an expanded
laboratory and office complex which will be leased by the Company under a 15
year operating lease. The Company has the option to purchase the facility at any
time during the lease at a predetermined price. The remaining parcel will be
held by the Company until such time as the Company's growth requires additional
expansion.
 
ITEM 3. LEGAL PROCEEDINGS
 
     Not applicable.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     Not applicable.
 
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS
 
     The Company's Common Stock has been traded on the Nasdaq National Market
System under the symbol NBIX since the Company's initial public offering on May
23, 1996. Prior to that time there was no established public trading market for
the Company's Common Stock. The following table sets forth for the periods
indicated the high and low sale price for the Common Stock.
 
<TABLE>
<CAPTION>
                                                             HIGH        LOW
                     FISCAL YEAR 1997                        ----        ---
<S>                                                          <C>         <C>
4th Quarter................................................   11 7/8       7 1/2
3rd Quarter................................................   10 3/4       7 7/8
2nd Quarter................................................   10 1/2       7
1st Quarter................................................   13 1/4       8 5/8
</TABLE>
 
<TABLE>
<CAPTION>
                     FISCAL YEAR 1996
<S>                                                          <C>         <C>
4th Quarter................................................   13           9 1/4
3rd Quarter................................................   12 3/8       6 1/2
2nd Quarter (from May 23, 1996)............................   13 1/4       8 1/8
</TABLE>
 
     As of February 28, 1998, there were approximately 234 holders of record of
Common Stock.
 
DIVIDEND POLICY
 
     The Company has not paid any cash dividends on its Common Stock since its
inception and does not anticipate paying cash dividends on its Common Stock in
the foreseeable future.
 
                                       21
<PAGE>   22
 
ITEM 6. SELECTED FINANCIAL DATA
 
     The following selected financial data have been derived from the Financial
Statements of the Company, which have been audited by Ernst & Young LLP. The
information presented below should be read in conjunction with the Company's
Financial Statements and Notes thereto included elsewhere in this Form 10-K. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
                            SELECTED FINANCIAL DATA
 
     The following tables set forth certain financial data with respect to the
Company (in thousands, except net income (loss) per share). The selected
financial data should be read in conjunction with the consolidated financial
statements and notes thereto.
 
<TABLE>
<CAPTION>
                                                       YEAR ENDED DECEMBER 31,
                                        ------------------------------------------------------
                                         1997        1996        1995        1994       1993
                                        -------    --------    --------    --------    -------
<S>                                     <C>        <C>         <C>         <C>         <C>
STATEMENT OF OPERATIONS DATA:
Revenues:
  Sponsored research..................  $11,250    $  7,344    $  3,000    $     --    $    --
  License fees........................       --       5,000       2,000          --         --
  Milestones..........................   10,250       4,000         750          --         --
  Other revenues......................    4,644       2,872         356         162         --
                                        -------    --------    --------    --------    -------
          Total revenues..............   26,144      19,216       6,106         162         --
Operating expenses:
  Research and development............   19,888      12,569       7,740       6,231      2,804
  General and administrative..........    5,664       3,697       2,728       2,223      1,550
                                        -------    --------    --------    --------    -------
          Total operating expenses....   25,552      16,266      10,468       8,454      4,354
Income (loss) from operations.........      592       2,950      (4,362)     (8,292)    (4,354)
Interest income, net..................    3,931       2,598         839         627        118
Other income (expense)................      818         574         177         (41)        --
                                        -------    --------    --------    --------    -------
Net income (loss) before income
  taxes...............................    5,341       6,122      (3,346)     (7,706)    (4,236)
Income taxes..........................      214         248          --          --         --
                                        -------    --------    --------    --------    -------
Net income (loss).....................  $ 5,127    $  5,874    $ (3,346)   $ (7,706)   $(4,236)
Earnings (loss) per share:
  Basic...............................  $  0.30    $   0.39    $  (0.29)   $  (0.70)   $ (0.69)
  Diluted.............................  $  0.28    $   0.36    $  (0.29)   $  (0.70)   $ (0.69)
Shares used in calculation of earnings
  (loss) per share
  Basic...............................   16,930      14,971      11,684      10,933      6,123
  Diluted.............................   18,184      16,127      11,684      10,933      6,123
BALANCE SHEET DATA:
Cash, cash equivalents and short-term
  investments*........................  $75,092    $ 69,920    $ 18,696    $ 18,228    $21,639
          Total assets................   91,903      77,957      24,012      22,344     24,436
Long-term debt........................      722         847       1,631       1,733        758
Accumulated deficit...................   (4,895)    (10,022)    (15,895)    (12,549)    (4,843)
          Total stockholders'
            equity....................   83,152      72,767      19,225      18,743     22,137
</TABLE>
 
- ---------------
* Excludes funds held by NPI, which is available to fund certain of the
  Company's research and development activities.
 
                                       22
<PAGE>   23
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS
 
     The following Management's Discussion and Analysis of Financial Condition
and Results of Operations of Neurocrine Biosciences, Inc. ("Neurocrine" or the
"Company") contains forward-looking statements which involve risks and
uncertainties, pertaining generally to the expected continuation of the
Company's collaborative agreements, the receipt of research payments thereunder,
the future achievement of various milestones in product development and the
receipt of payments related thereto, the potential receipt of royalty payments,
and financial results and operations. Actual results could differ materially
from those anticipated in such forward-looking statements as a result of various
factors, including those set forth below, and those outlined in "Item
1 -- Business" above.
 
OVERVIEW
 
     Since the founding of the Company in January 1992, Neurocrine has been
engaged in the discovery and development of novel pharmaceutical products for
diseases and disorders of the central nervous and immune systems. To date,
Neurocrine has not generated any revenues from the sale of products, and does
not expect to generate any product revenues for the foreseeable future. The
Company's revenues are expected to come from its strategic alliances for the
next several years.
 
     Results of Operations. Revenues increased to $26.1 million in 1997 compared
with $19.2 million in 1996 and $6.1 million in 1995. These increases were
primarily due to increased sponsored research, license fees, and milestone
revenues recognized under the Janssen, Novartis, and Eli Lilly collaborations.
 
     Research and development expenses increased to $19.9 million in 1997
compared with $12.6 million in 1996 and $7.7 million in 1995. These increases
reflect continued additions to scientific personnel and related support
expenditures as the Company increased its research, development, and clinical
activities primarily in the CRF and Altered Peptide Ligand programs and the
recognition of $1.1 million of research and development expenses related to the
Company's minority owned investee, NPI.
 
     General and administrative expenses increased to $5.7 million in 1997
compared with $3.7 million in 1996 and $2.7 million in 1995. These increases
reflect the additional administrative staff required to support increased
research, development and clinical activities, increased facility expenses,
increased patent costs and expanded business development activities.
 
     Interest income increased to $4.1 million in 1997 compared with $2.9
million in 1996 and $1.1 million in 1995. These increases were due to increased
investment income attributable to increased cash and short-term investments
purchased with proceeds from the Company's prior financings and corporate
collaborators.
 
     Net income decreased to $5.1 million or $0.30 per share ($0.28 assuming
dilution) in 1997 compared with net income of $5.9 million or $0.39 per share
($0.36 assuming dilution) for 1996 and increased compared to a net loss of $3.3
million or $0.29 per share in 1995. The decrease in net income from 1996 to 1997
was primarily due to increased research and development expenditures. The
increase in net income from 1995 to 1996 was primarily attributable to increased
revenues earned under the Company's collaborations. Neurocrine has incurred a
cumulative deficit of approximately $4.9 million as of December 31, 1997 and
expects to incur additional operating losses in the future which are potentially
greater than losses in prior years.
 
     Liquidity and Capital Resources. At December 31, 1997 the Company's cash,
cash equivalents, and short-term investments totaled $75.1 million. The Company
invests its excess cash primarily in investment grade debt instruments,
marketable debt securities of U.S. government agencies, and high grade
commercial paper. Management has established guidelines relative to
diversification and maturities that maintain safety and liquidity. The primary
market risk associated with such investments is vulnerability to changes in
short-term and long-term U.S. prime interest rates. See "Notes to Financial
Statements -- Notes 1 and 2" below for further information regarding the
Company's investments.
 
     Net cash provided by operating activities in 1997 increased to $11.0
million compared with $6.7 million in 1996 and net cash used of $2.4 million in
1995. The 1997 and 1996 increase in cash provided by operating
 
                                       23
<PAGE>   24
 
activities and the 1995 decline in cash used in operating activities was
primarily the result of the timing of cash receipts under the Janssen, Novartis
and Eli-Lilly collaborations.
 
     Net cash used in investing activities was $7.2 million in 1997 compared
with $48.6 million used in 1996 and $933,000 provided by investing activities in
1995. The cash used in investing activities in 1997 and 1996 resulted from the
purchase of short-term investments with proceeds from the Company's prior
financings and the sale of Common Stock to corporate collaborators. The cash
provided by investing activities in 1995 resulted from the timing differences of
various investment purchases and sales/maturities, in addition to the
fluctuations in the Company's portfolio mix between cash and cash equivalent and
short-term investment holdings.
 
     Net cash provided by financing activities was $659,000 in 1997 compared
with $46.8 million in 1996 and $3.2 million in 1995. The cash provided in 1997
resulted from issuances of Common Stock upon the exercises of stock options and
warrants and proceeds from a note payable used to finance the purchase of land.
The 1997 decrease resulted from the decline in outside equity financings during
this period. The 1996 increase resulted from proceeds received from the
Company's initial public offering and the sale of Common Stock to corporate
collaborators in May 1996.
 
     Neurocrine has primarily financed its operations through proceeds from the
sale of Common Stock in various private and public offerings as well as to
corporate collaborators.
 
     In February 1995, the Company entered into a three year collaborative
research and development agreement with Janssen for the development of CRF
receptor antagonists for the treatment of anxiety, depression and substance
abuse. Janssen paid the Company $3.7 million in 1997 and $3.0 million in 1996
for sponsored research. Milestone payments totaled $1.5 million and $1.0 million
for 1997 and 1996, respectively. The collaborative research portion of the
agreement was completed as scheduled in 1997 with the selection of a clinical
candidate and the commencement of clinical trials in Europe. The Company may
continue to receive milestone payments and royalties upon the successful
continuation of the development portion of the agreement.
 
     In January 1996, the Company entered into an agreement with Novartis to
develop altered peptide ligands for the treatment of multiple sclerosis.
Novartis paid the Company $7.2 million in 1997 and $8.5 million in 1996 for
license fees and research funding. Milestone payments were $3.8 million and $3.0
million for 1997 and 1996, respectively.
 
     In March 1996, the Company participated in the formation of a research and
development company, Neuroscience Pharma, Inc. (NPI), with a group of Canadian
investors.
 
     In October 1996, the Company entered into a Collaborative Research
Agreement with Eli Lilly and Company to discover and develop corticotropin
releasing factor (CRF) -- binding protein ligand inhibitors for the treatment of
central-nervous system disorders, including obesity and dementia, such as that
associated with Alzheimer's disease. Lilly paid the Company $4.1 million in 1997
and $1.3 million in 1996 for research. Milestone payments totaled $5.0 million
in 1997.
 
     In May 1997, the Company purchased two adjacent parcels of land in San
Diego for approximately $5.0 million in cash. The Company sold one parcel to a
third party in 1997, but expects to repurchase the land and lease the parcel to
Science Park Center LLC, a California limited liability company (the "LLC"), of
which the Company owns a minority interest. The LLC will construct an expanded
laboratory and office complex which will be leased by the Company under a 15
year operating lease. The Company has the option to purchase the facility at any
time during the lease at a predetermined price. The remaining parcel will be
held by the Company until such time as the Company's growth requires additional
expansion.
 
     In December 1997, the Company issued 600,502 shares of Common Stock upon
the exercise of warrants by certain of the original investors in NPI.
 
     The Company believes that its existing capital resources, together with
interest income and future payments due under the strategic alliances, will be
sufficient to satisfy its current and projected funding requirements at least
through 2000. However, no assurance can be given that such capital resources and
payments will be sufficient to conduct its research and development programs as
planned. The amount and
 
                                       24
<PAGE>   25
 
timing of expenditures will vary depending upon a number of factors, including
progress of the Company's research and development programs.
 
     Year 2000 Compliance. The Company has implemented systems and software
infrastructures which are Year 2000 compliant. Although the Company believes its
key financial, information and operational systems are Year 2000 compliant,
there can be no assurance that other defects will not be discovered in the
future. The Company is unable to control whether the firms and vendors that it
does business with currently, and in the future, will have systems that are Year
2000 compliant. The Company's operations could be affected to the extent that
the firms and vendors would be unable to provide services and ship products.
However, management does not believe that Year 2000 changes will have a material
impact on its business, financial condition or results of operations.
 
     The foregoing Management's Discussion and Analysis of Financial Condition
and Results of Operations of Neurocrine Biosciences, Inc., as well as the
preceding sections of this Annual Report on Form 10-K, contain forward-looking
statements which involve risks and uncertainties, pertaining generally to the
expected continuation of the Company's collaborative agreements, the receipt of
research payments thereunder, the future achievement of various milestones in
product development and the receipt of payments related thereto, the potential
receipt of royalty and profit-sharing payments, the anticipated dates of
commencement of selection of development candidates and the commencement of
clinical trials, the successful continuation of the Company's research and
development programs and the potential development of future products, the
period of time the Company's existing capital resources will meet its funding
requirements, and the Company's financial results and operations. Actual results
could differ materially from those anticipated in such forward-looking
statements as a result of various factors, including those outlined in "Item
1 -- Business" above. The Company's business is subject to significant risks,
including but not limited to, the risks inherent in its research and development
activities, including uncertainties associated with the successful continuation
of the Company's strategic collaborations, uncertainties associated with the
successful accomplishment of milestones pursuant to these collaborations, the
successful completion of clinical trials, the lengthy, expensive and uncertain
process of seeking regulatory approvals, uncertainties associated both with
obtaining and enforcing its patents and with patent rights of others,
uncertainties regarding government reforms and of product pricing and
reimbursement levels, technological change and competition, manufacturing
uncertainties, and uncertainties associated with dependence on third parties.
Even if the Company's product candidates appear promising at an early stage of
development, they may not reach the market for numerous reasons. Such reasons
include the possibilities that the product will be ineffective or unsafe during
clinical trials, will fail to receive necessary regulatory approvals, will be
difficult to manufacture on large scale, will be uneconomical to market or will
be precluded from commercialization by proprietary rights of third parties.
 
     Neurocrine will require substantial additional funding for the continuation
of its research and product development programs, for progress with preclinical
testing and clinical trials, for operating expenses, for the pursuit of
regulatory approvals for its product candidates, for the costs involved in
filing and prosecuting patent applications and enforcing patent claims, if any,
the cost of product in-licensing and any possible acquisitions, and may require
additional funding for establishing manufacturing and marketing capabilities in
the future. The Company may seek to access the public or private equity markets
whenever conditions are favorable. The Company may also seek additional funding
through strategic alliances and other financing mechanisms, potentially
including off-balance sheet financing. There can be no assurance that adequate
funding will be available on terms acceptable to the Company, if at all. If
adequate funds are not available, the Company may be required to curtail
significantly one or more of its research or development programs or obtain
funds through arrangements with collaborative partners or others. This may
require the Company to relinquish rights to certain of its technologies or
product candidates.
 
     Neurocrine expects to incur substantial additional operating expenses over
the next several years as its research, development, preclinical testing and
clinical trial activities increase. To the extent that the Company is unable to
obtain third-party funding for such expenses, the Company expects that increased
expenses will result in increased losses from operations. There can be no
assurance that the Company's products under development will be successfully
developed or that its products, if successfully developed, will generate
revenues sufficient to enable the Company to earn a profit.
                                       25
<PAGE>   26
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTAL DATA
 
     See the list of the Company's Financial Statements filed with this Form
10-K under Item 14 below.
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE
 
     Not Applicable.
 
                                    PART III
 
ITEM 10. EXECUTIVE OFFICERS AND DIRECTORS OF THE REGISTRANT
 
     Information required by this item will be contained in the Company's Notice
of 1998 Annual Meeting of Stockholders and Proxy Statement, pursuant to
Regulation 14A, to be filed with the Securities and Exchange Commission within
120 days after December 31, 1997 and is incorporated herein by reference.
 
ITEM 11. EXECUTIVE COMPENSATION
 
     Information required by this item will be contained in the Company's Notice
of 1998 Annual Meeting of Stockholders and Proxy Statement, pursuant to
Regulation 14A, to be filed with the Securities and Exchange Commission within
120 days after December 31, 1997 and is incorporated herein by reference.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     Information required by this item will be contained in the Company's Notice
of 1998 Annual Meeting of Stockholders and Proxy Statement, pursuant to
Regulation 14A, to be filed with the Securities and Exchange Commission within
120 days after December 31, 1997 and is incorporated herein by reference.
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     Information required by this item will be contained in the Company's Notice
of 1998 Annual Meeting of Stockholders and Proxy Statement, pursuant to
Regulation 14A, to be filed with the Securities and Exchange Commission within
120 days after December 31, 1997 and is incorporated herein by reference.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K
 
(a) Documents filed as part of this report.
    1. List of Financial Statements. The following financial statements of
       Neurocrine Biosciences, Inc. and Report of Ernst & Young LLP, Independent
       Accountants, are included in this report:
 
       Report of Ernst & Young LLP, Independent Auditors
       Balance Sheet as of December 31, 1997 and 1996
       Statement of Operations for the years ended December 31, 1997, 1996 and
       1995
       Statement of Stockholders' Equity for the years ended December 31, 1997,
       1996 and 1995
       Statement of Cash Flows for the years ended December 31, 1997, 1996 and
       1995
       Notes to Financial Statements
 
     2. List of all Financial Statement schedules. All schedules are omitted
        because they are not applicable or the required information is shown in
        the Financial Statements or notes thereto.
 
     3. List of Exhibits Required by Item 601 of Regulation S-K. See part (c)
below.
 
(b)Reports on Form 8-K. No reports on Form 8-K were filed during the quarter
   ended December 31, 1997.
 
                                       26
<PAGE>   27
 
(c)Exhibits. The following exhibits are filed as part of, or incorporated by
   reference into, this report:
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION
- -------                          -----------
<S>      <C>
3.1      Restated Certificate of Incorporation.(1)
3.2      Bylaws.(1)
3.3      Certificate of Amendment of Bylaws.
4.1      Form of Lock-Up Agreement.(1)
4.2      Form of Common Stock Certificate.(1)
4.3      Form of warrant issued to existing warrant holders.(1)
4.4      Form of Series A warrant issued in connection with the
         execution by the Company of the Unit Purchase Agreement (see
         below).(1)
4.5      New Registration Rights Agreement dated March 29, 1996 among
         the Company and the investors signatory thereto.(1)
4.6      Letter of Intent between Northwest NeuroLogic, Inc. and the
         Company dated February 27, 1998.(2)
10.1     Purchase and Sale Agreement and Escrow Instructions between
         MS Vickers II, LLC and the Company dated February 13,
         1997.(3)
10.2     1992 Incentive Stock Plan, as amended.
10.3     1996 Employee Stock Purchase Plan.(1)
10.4     1996 Director Stock Option Plan and form of stock option
         agreement.(1)
10.5     Form of Director and Officer Indemnification Agreement.(1)
10.6     Employment Agreement dated March 1, 1997, between the
         Registrant and Gary A. Lyons, as amended.(4)
10.7     Employment Agreement dated March 1, 1997, between the
         Registrant and Errol B. De Souza, Ph.D.(4)
10.8     Employment Agreement dated March 1, 1997, between the
         Registrant and Paul W. Hawran.(4)
10.9     Employment Agreement dated March 1, 1997, between the
         Registrant and Stephen Marcus, M.D.
10.10    Consulting Agreement dated September 25, 1992, between the
         Registrant and Wylie A. Vale, Ph.D.(1)
10.11    Consulting Agreement effective as of January 1, 1992,
         between the Registrant and Lawrence J. Steinman, M.D.(1)
10.12    Lease Agreement dated June 1, 1993, between the Registrant
         and Hartford Accident and Indemnity Company, as amended.(1)
10.13    Exclusive License Agreement dated as of July 1, 1993, by and
         between the Beckman Research Institute of the City of Hope
         and the Registrant covering the treatment of nervous system
         degeneration and Alzheimer's disease.(1)
10.14    Exclusive License Agreement dated as of July 1, 1993, by and
         between the Beckman Research Institute of the City of Hope
         and the Registrant covering the use of Pregnenolone for the
         enhancement of memory.(1)
10.15    License Agreement dated May 20, 1992, by and between The
         Salk Institute for Biological Studies and the Registrant.(1)
10.16    License Agreement dated July 17, 1992, by and between The
         Salk Institute for Biological Studies and the Registrant.(1)
</TABLE>
 
                                       27
<PAGE>   28
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                           DESCRIPTION
- -------                          -----------
<S>      <C>
10.17    License Agreement dated November 16, 1993, by and between
         The Salk Institute for Biological Studies and the
         Registrant.(1)
10.18    License Agreement dated October 19, 1992, by and between The
         Board of Trustees of the Leland Stanford Junior University
         and the Registrant.(1)
10.19    Agreement dated January 1, 1995, by and between the
         Registrant and Janssen Pharmaceutica, N.V.(1)
10.20    Letter Agreement dated January 19, 1996, by and between the
         Registrant and Ciba-Geigy Limited.(1)
10.21+   Unit Purchase Agreement dated March 29, 1996, by and between
         Neuroscience Pharma (NPI) Inc., the Registrant and the
         investors signatory thereto.(1)
10.22+   Exchange Agreement dated March 29, 1996, by and between
         Neurocrine Biosciences (Canada) Inc., the Registrant and the
         investors signatory thereto.(1)
10.23+   Research and Development Agreement dated March 29, 1996, by
         and between Neurocrine Biosciences (Canada) Inc. and
         Neuroscience Pharma (NPI) Inc.(1)
10.24+   Intellectual Property and License Grants Agreement dated
         March 29, 1996, by and between the Registrant and Neurocrine
         Biosciences (Canada) Inc.(1)
10.25+   Development and Commercialization Agreement dated December
         20, 1996, by and between Ciba-Geigy Ltd. and the
         Registrant.(5)
10.26+   Letter and Purchase Order dated June 7, 1996, by and between
         Ciba-Geigy and the Registrant.(5)
10.27    Third Lease Amendment dated June 6, 1996, by and between
         Talcott Realty I Limited Partnership and the Registrant.(5)
10.28+   Research and License Agreement dated October 15, 1996,
         between the Registrant and Eli Lilly and Company.(5)
10.29+   Lease between Science Park Center LLC and the Company.(6)
10.30+   Option Agreement between Science Park Center LLC (Optionor)
         and the Company (Optionee).(6)
10.31+   Construction Loan Agreement.(6)
10.32    Secured Promissory Note.(6)
10.33+   Operating Agreement for Science Park Center LLC.(6)
10.34    Information and Registration Rights Agreement dated
         September 15, 1992, as amended to date.(1)
10.35    Form of incentive stock option agreement and nonstatutory
         stock option agreement for use in connection with 1992
         Incentive Stock Plan.(1)
21       Subsidiaries of the Company.
23       Consent of Ernst & Young LLP, Independent Auditors.
24       Power of Attorney (reference is made to the following page
         of this Form 10-K).
27.1     Financial Data Schedule for the fiscal year ended December
         31, 1997.
27.2     Financial Data Schedule for the fiscal year ended December
         31, 1996.
</TABLE>
 
- ---------------
(1) Incorporated by reference to the Company's Registration Statement on Form
    S-1 (Registration No. 333-03172).
 
(2) Incorporated by reference to the Company's Report on Form 8-K filed on March
    13, 1998.
 
(3) Incorporated by reference to the Company's amended Quarterly Report on Form
    10-Q filed on August 15, 1997.
                                       28
<PAGE>   29
 
(4) Incorporated by reference to the Company's Quarterly Report on Form 10-Q
    filed on August 14, 1997.
 
(5) Incorporated by reference to the Company's Report on Form 10-K for the
    fiscal year ended December 31, 1996, as amended.
 
(6) Incorporated by reference to the Company's Quarterly Report on Form 10-Q
    filed on November 14, 1997.
 
 *  Confidential treatment has been requested with respect to certain portions
    of the exhibit.
 
 +  Confidential treatment has been granted with respect to certain portions of
    the exhibit.
 
(d) Financial Statement Schedules
 
     See Item 14(a)(2) above.
 
                                       29
<PAGE>   30
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          NEUROCRINE BIOSCIENCES, INC.,
                                          a Delaware Corporation
 
                                          By:       /s/ GARY A. LYONS
 
                                            ------------------------------------
                                                       Gary A. Lyons
                                               President and Chief Executive
                                                           Officer
 
Date: March 31, 1998
 
                               POWER OF ATTORNEY
 
     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Gary A. Lyons and Paul W. Hawran, jointly
and severally his attorneys-in-fact, each with the power of substitution, for
him in any and all capacities, to sign any amendment to this Report on Form
10-K, and to file the same, with exhibits thereto and other documents in
connection therewith, with the Securities and Exchange Commission, hereby
ratifying and confirming all that each of said attorneys-in-fact, or his
substitute or substitutes, may or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed by the following persons on behalf of the Registrant and
in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
              SIGNATURE                                    TITLE                           DATE
              ---------                                    -----                           ----
<S>                                    <C>                                            <C>
 
          /s/ GARY A. LYONS            President, Chief Executive Officer and         March 31, 1998
- ------------------------------------   Director (Principal Executive Officer)
            Gary A. Lyons
 
         /s/ PAUL W. HAWRAN            Chief Financial Officer (Principal Financial   March 31, 1998
- ------------------------------------   and Accounting Officer)
           Paul W. Hawran
 
      /s/ HARRY F. HIXSON, JR.         Chairman of the Board of Directors             March 31, 1998
- ------------------------------------
        Harry F. Hixson, Jr.
 
        /s/ DAVID E. ROBINSON          Director                                       March 31, 1998
- ------------------------------------
          David E. Robinson
 
        /s/ JOSEPH A. MOLLICA          Director                                       March 31, 1998
- ------------------------------------
          Joseph A. Mollica
 
        /s/ ERROL B. DESOUZA           Executive Vice President, Research and         March 31, 1998
- ------------------------------------   Development and Director
          Errol B. DeSouza
 
          /s/ WYLIE W. VALE            Director                                       March 31, 1998
- ------------------------------------
            Wylie W. Vale
</TABLE>
 
                                       30
<PAGE>   31
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Ernst & Young LLP, Independent Auditors...........   32
Balance Sheet...............................................   33
Statement of Operations.....................................   34
Statement of Stockholders' Equity...........................   35
Statement of Cash Flows.....................................   36
Notes to Financial Statements...............................   37
</TABLE>
 
                                       31
<PAGE>   32
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Neurocrine Biosciences, Inc.
 
     We have audited the accompanying balance sheet of Neurocrine Biosciences,
Inc. as of December 31, 1997 and 1996, and the related statements of operations,
stockholders' equity, and cash flows for each of the three years in the period
ended December 31, 1997. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Neurocrine Biosciences, Inc.
at December 31, 1997 and 1996, and the results of its operations and its cash
flows for each of the three years in the period ended December 31, 1997, in
conformity with generally accepted accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
                                          --------------------------------------
                                          ERNST & YOUNG LLP
San Diego, California
February 3, 1998,
except for Note 10,
for which the date is
February 27, 1998
 
                                       32
<PAGE>   33
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                                 BALANCE SHEET
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                                      DECEMBER 31,
                                                              ----------------------------
                                                                  1997            1996
                                                              ------------    ------------
<S>                                                           <C>             <C>
Current assets
Cash and cash equivalents...................................  $ 15,771,099    $ 11,325,361
  Short-term investments, available for sale................    59,321,095      58,594,853
  Receivable under collaborative agreements.................       193,784       1,329,513
  Other current assets......................................     1,091,653         840,962
                                                              ------------    ------------
          Total current assets..............................    76,377,631      72,090,689
Property and equipment, net.................................     8,846,179       3,546,420
Licensed technology and patent application costs, net.......     1,185,384       1,443,403
Investment in NPI...........................................     3,343,740              --
Other assets................................................     2,150,451         876,070
                                                              ------------    ------------
          Total assets......................................  $ 91,903,385    $ 77,956,582
                                                              ============    ============
 
                           LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities
  Accounts payable..........................................  $  1,822,173    $    800,157
  Accrued liabilities.......................................     2,756,352       1,564,889
  Deferred revenue..........................................     1,918,750         918,750
  Current portion of long-term debt.........................       872,595         783,718
                                                              ------------    ------------
          Total current liabilities.........................     7,369,870       4,067,514
Long-term debt..............................................       721,894         846,744
Deferred rent...............................................       659,146         275,356
Commitments
Stockholders' equity
  Preferred Stock, $0.001 par value, 5,000,000 shares
     authorized, no shares issued and outstanding...........            --              --
  Common Stock, no par value: authorized
     shares -- 100,000,000 issued and outstanding
     shares -- 17,686,802 in 1997 and 16,776,614 in 1996....    88,604,106      83,251,404
  Deferred compensation.....................................      (439,582)       (377,057)
  Notes receivable from stockholders........................      (119,848)       (127,704)
  Unrealized gains on short-term investments................         2,500          41,870
  Accumulated deficit.......................................    (4,894,701)    (10,021,545)
                                                              ------------    ------------
          Total stockholders' equity........................    83,152,475      72,766,968
                                                              ------------    ------------
          Total liabilities and stockholders' equity........  $ 91,903,385    $ 77,956,582
                                                              ============    ============
</TABLE>
 
                            See accompanying notes.
                                       33
<PAGE>   34
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                            STATEMENT OF OPERATIONS
 
<TABLE>
<CAPTION>
                                                               YEAR ENDED DECEMBER 31,
                                                      -----------------------------------------
                                                         1997           1996           1995
                                                         ----        -----------    -----------
<S>                                                   <C>            <C>            <C>
Revenues:
  Sponsored research................................  $11,250,000    $ 7,343,750    $ 3,000,000
  License fees......................................           --      5,000,000      2,000,000
  Milestones........................................   10,250,000      4,000,000        750,000
  Other revenues....................................    4,643,616      2,871,912        355,750
                                                      -----------    -----------    -----------
          Total revenues............................   26,143,616     19,215,662      6,105,750
Operating expenses:
  Research and development..........................   19,887,917     12,569,114      7,740,128
  General and administrative........................    5,663,580      3,696,515      2,728,342
                                                      -----------    -----------    -----------
          Total operating expenses..................   25,551,497     16,265,629     10,468,470
Income (loss) from operations.......................      592,119      2,950,033     (4,362,720)
Interest income.....................................    4,083,552      2,870,407      1,137,004
Interest expense....................................     (152,817)      (272,464)      (297,675)
Other income........................................      818,078        573,627        177,001
                                                      -----------    -----------    -----------
Income (loss) before income taxes...................    5,340,932      6,121,603     (3,346,390)
Income taxes........................................      214,088        247,683             --
                                                      -----------    -----------    -----------
Net income (loss)...................................  $ 5,126,844    $ 5,873,920    $(3,346,390)
                                                      ===========    ===========    ===========
Earnings (loss) per common share
  Basic.............................................  $      0.30    $      0.39    $     (0.29)
  Diluted...........................................  $      0.28    $      0.36    $     (0.29)
Shares used in the calculation of earnings (loss)
  per share
  Basic.............................................   16,929,925     14,970,734     11,683,877
  Diluted...........................................   18,184,458     16,127,034     11,683,877
</TABLE>
 
                            See accompanying notes.
                                       34
<PAGE>   35
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                       STATEMENT OF STOCKHOLDERS' EQUITY
 
<TABLE>
<CAPTION>
                                                                                       UNREALIZED
                                                                                          GAINS
                                                                           NOTES        (LOSSES)
                                                                         RECEIVABLE        ON                           TOTAL
                                                           DEFERRED         FROM       SHORT-TERM    ACCUMULATED    STOCKHOLDERS'
                                 SHARES      AMOUNT      COMPENSATION   STOCKHOLDERS   INVESTMENTS     DEFICIT         EQUITY
                               ----------  -----------   ------------   ------------   -----------   ------------   -------------
<S>                            <C>         <C>           <C>            <C>            <C>           <C>            <C>
Balance at December 31,
  1994.......................  11,059,426  $31,463,666    $      --      $(148,263)     $(23,535)    $(12,549,075)   $18,742,793
Issuance of Common Stock for
  cash.......................     659,635    3,730,000           --             --            --               --      3,730,000
Issuances of Common Stock for
  services...................       4,040       20,200           --             --            --               --         20,200
Payment on notes
  receivable.................          --           --           --         10,086            --               --         10,086
Deferred compensation related
  to grant of stock
  options....................          --      384,075     (384,075)            --            --               --             --
Amortization of deferred
  compensation...............          --           --       41,396             --            --               --         41,396
Unrealized gains on
  short-term investments.....          --           --           --             --        26,854               --         26,854
Net loss.....................          --           --           --             --            --       (3,346,390)    (3,346,390)
                               ----------  -----------    ---------      ---------      --------     ------------    -----------
Balance at December 31,
  1995.......................  11,723,101   35,597,941     (342,679)      (138,177)        3,319      (15,895,465)    19,224,939
Issuance of Common Stock for
  cash.......................   5,053,513   47,539,591           --             --            --               --     47,539,591
Payments on notes
  receivable.................          --           --           --         10,473            --               --         10,473
Deferred compensation related
  to grant of stock
  options....................          --      113,872     (113,872)            --            --               --             --
Amortization of deferred
  compensation...............          --           --       79,494             --            --               --         79,494
Unrealized gains on
  short-term investments.....          --           --           --             --        38,551               --         38,551
Net income...................          --           --           --             --            --        5,873,920      5,873,920
                               ----------  -----------    ---------      ---------      --------     ------------    -----------
Balance at December 31,
  1996.......................  16,776,614   83,251,404     (377,057)      (127,704)       41,870      (10,021,545)    72,766,968
Issuance of Common Stock for
  warrants...................     182,467       59,250           --             --            --               --         59,250
Issuance of Common Stock for
  stock options..............     105,686      453,301           --             --            --               --        453,301
Issuance of Common Stock
  under the Employee Stock
  Purchase Plan..............      21,533      174,411           --             --            --               --        174,411
Issuance of Common Stock in
  exchange for investment in
  NPI........................     600,502    4,473,740           --             --            --               --      4,473,740
Payments on notes
  receivable.................          --           --           --          7,856            --               --          7,856
Deferred compensation related
  to grant of stock
  options....................          --      192,000     (192,000)            --            --               --             --
Amortization of deferred
  compensation...............          --           --      129,475             --            --               --        129,475
Unrealized losses on
  short-term investments.....          --           --           --             --       (39,370)              --        (39,370)
Net income...................          --           --           --             --            --        5,126,844      5,126,844
                               ----------  -----------    ---------      ---------      --------     ------------    -----------
Balance at December 31,
  1997.......................  17,686,802  $88,604,106    $(439,582)     $(119,848)     $  2,500     $ (4,894,701)   $83,152,475
                               ==========  ===========    =========      =========      ========     ============    ===========
</TABLE>
 
                            See accompanying notes.
 
                                       35
<PAGE>   36
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                            STATEMENT OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED DECEMBER 31,
                                                  ---------------------------------------------
                                                      1997             1996            1995
                                                  -------------    ------------    ------------
<S>                                               <C>              <C>             <C>
CASH FLOW FROM OPERATING ACTIVITIES:
Net income (loss)...............................  $   5,126,844    $  5,873,920    $ (3,346,390)
Adjustments to reconcile net income (loss) to
  net cash provided by (used in) operating
  activities:
  Depreciation and amortization.................      1,322,231         980,833         715,398
  Research and development expense related to
     NPI........................................      1,130,000              --              --
  Deferred revenue..............................      1,000,000         418,750         500,000
  Deferred rent.................................        383,790          61,431         213,925
  Compensation expense recognized for stock
     options....................................        129,475          79,494          41,396
  Common Stock issued for technology............             --              --          20,200
  Write-off of licensed technology and patent
     costs......................................         75,762              --              --
  Loss on sale of assets........................             --          25,370              --
  Change in operating assets and liabilities:
     Receivable under collaborative
       agreements...............................      1,135,729        (329,513)     (1,000,000)
     Other current assets.......................       (250,691)       (606,628)         67,797
     Other assets...............................     (1,274,381)       (486,774)          9,516
     Accounts payable and accrued liabilities...      2,213,479         664,876         356,429
                                                  -------------    ------------    ------------
Net cash flows provided by (used in) operating
  activities....................................     10,992,238       6,681,759      (2,421,729)
CASH FLOW FROM INVESTING ACTIVITIES:
Purchases of short-term investments.............   (113,080,238)    (85,171,207)    (17,854,139)
Sales/maturities of short-term investments......    112,314,626      38,918,365      19,098,351
Purchase of licensed technology and patent
  application costs, net........................             --        (663,796)       (263,261)
Purchases of property and equipment, net........     (6,439,733)     (1,640,337)        (47,657)
                                                  -------------    ------------    ------------
Net cash flows (used in) provided by investing
  activities....................................     (7,205,345)    (48,556,975)        933,294
CASH FLOW FROM FINANCING ACTIVITIES:
Issuance of Common Stock, net...................        686,962      47,539,591       3,730,000
Principal payments on obligations under capital
  leases........................................       (782,763)       (742,236)       (574,954)
Proceeds from note payable......................        746,790              --              --
Payments received on notes receivable from
  stockholders..................................          7,856          10,473          10,086
                                                  -------------    ------------    ------------
Net cash flows provided by financing
  activities....................................        658,845      46,807,828       3,165,132
                                                  -------------    ------------    ------------
Net increase in cash and cash equivalents.......      4,445,738       4,932,612       1,676,697
Cash and cash equivalents at beginning of
  year..........................................     11,325,361       6,392,749       4,716,052
                                                  -------------    ------------    ------------
Cash and cash equivalents at end of the year....  $  15,771,099    $ 11,325,361    $  6,392,749
                                                  =============    ============    ============
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
  INFORMATION
  Interest paid.................................  $     152,817    $    272,464    $    298,332
                                                  =============    ============    ============
  Taxes paid....................................  $     250,000    $     40,000    $         --
                                                  =============    ============    ============
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND
  FINANCING ACTIVITIES
Furniture and equipment financed with
  obligations under capital leases..............  $          --    $         --    $    689,791
                                                  =============    ============    ============
</TABLE>
 
                             See accompanying notes
                                       36
<PAGE>   37
 
                          NEUROCRINE BIOSCIENCES, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1997
 
 1. ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
     Organization and Business Activity: Neurocrine Biosciences, Inc. (the
"Company") was incorporated in California on January 17, 1992 and was
reincorporated in Delaware in March 1996. The Company is engaged in the
discovery and development of therapeutics for the treatment of diseases and
disorders of the central nervous and immune systems which includes anxiety,
depression, Alzheimer's disease, obesity, stroke and multiple sclerosis.
 
     Cash Equivalents:  The Company considers as cash equivalents all highly
liquid investments with a maturity of three months or less when purchased.
 
     Short-Term Investments Available-for-Sale: In accordance with Statement of
Financial Accounting Standards ("SFAS") No. 115, "Accounting for Certain Debt
and Equity Securities," short-term investments are classified as
available-for-sale. Available-for-sale securities are carried at fair value,
with the unrealized gains and losses reported in a separate component of
stockholders' equity. The amortized cost of debt securities in this category is
adjusted for amortization of premiums and accretion of discounts to maturity.
Such amortization is included in investment income. Realized gains and losses
and declines in value judged to be other-than-temporary, if any, on
available-for-sale securities are included in investment income. The cost of
securities sold is based on the specific identification method. Interest and
dividends on securities classified as available-for-sale are included in
interest income.
 
     The Company invests its excess cash primarily in investment grade debt
instruments, marketable debt securities of U.S. government agencies, and high
grade commercial paper. Management has established guidelines relative to
diversification and maturities that maintain safety and liquidity.
 
     Property and Equipment: Furniture, equipment and leasehold improvements are
carried at cost. Depreciation and amortization are provided over the estimated
useful lives of the assets, ranging from five to seven years, using the
straight-line method.
 
     Licensed Technology and Patent Application Costs: Licensed technology
consists of exclusive, worldwide, perpetual licenses to patents related to the
Company's platform technology which are capitalized at cost and amortized over
periods of 7 to 11 years.
 
     Asset Impairment: The Company accounts for its Long-Lived Assets in
accordance with SFAS No. 121, "Accounting for the Impairment of Long-Lived
Assets and for Long-Lived Assets to Be Disposed Of". There were no material
adjustments to the carrying values of these assets during 1997 and 1996.
 
     Research and Development Revenue and Expenses: Revenue under strategic
alliances is recognized over the term of the agreement. Advance payments
received in excess of amounts earned are classified as deferred revenue and
recognized as income in the period earned. Research and development costs are
expensed as incurred.
 
     Stock-Based Compensation: The Company has elected to continue to follow
Accounting Principles Board Opinion No. 25, "Accounting for Stock Issued to
Employees" (APB 25) and related Interpretations in accounting for its employee
stock options. The alternative fair value accounting provided for under SFAS No.
123, "Accounting for Stock-Based Compensation," requires use of option valuation
models that were not developed for use in valuing employee stock options. As a
result, deferred compensation is recorded only in the event that the fair market
value of the stock on the date of the option grant exceeds the exercise price of
the options. Such deferred compensation is amortized over the vesting period of
the options. Compensation expense recognized during the years ended December 31,
1997, 1996 and 1995 was $129,475, $79,494 and $41,396, respectively.
 
                                       37
<PAGE>   38
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
     Earnings Per Share: In February 1997, the Financial Accounting Standards
Board issued SFAS No. 128, "Earnings Per Share" (Statement No. 128). Statement
No. 128 is effective for financial statements issued for periods ending after
December 15, 1997. Statement No. 128 replaces APB Opinion 15, Earnings per Share
("EPS"). Statement No. 128 requires dual presentation of basic and diluted
earnings per share by entities with complex capital structures. Basic EPS
includes no dilution and is computed by dividing net income by the weighted
average number of common shares outstanding for the period. Diluted EPS reflects
the potential dilution of securities that could share in the earnings of the
Company such as common stock which may be issuable upon exercise of outstanding
common stock options, warrants and preferred stock.
 
     Comprehensive Income and Segment Information: In June 1997, the Financial
Accounting Standards Board issued SFAS No. 130, "Reporting Comprehensive Income"
and SFAS No. 131, "Segment Information". Both of these standards are effective
for fiscal years beginning after December 15, 1997. SFAS No. 130 requires that
all components of comprehensive income, including net income, be reported in the
financial statements in the period in which they are recognized. Comprehensive
income is defined as the change in equity during a period from transactions and
other events and circumstances from non-owner sources. Net income and other
comprehensive income, including foreign currency translation adjustments, and
unrealized gains and losses on investments, shall be reported net of their
related tax effect, to arrive at comprehensive income. The Company does not
believe that comprehensive income or loss will be materially different than net
income or loss. SFAS No. 131 amends the requirements for public enterprises to
report financial and descriptive information about its reportable operating
segments. Operating segments, as defined in SFAS No. 131, are components of an
enterprise for which separate financial information is available and is
evaluated regularly by the Company in deciding how to allocate resources and in
assessing performance. The financial information is required to be reported on
the basis that is used internally for evaluating the segment performance. The
Company believes it operates in one business and operating segment and does not
believe adoption of the standard will have a material impact on the Company's
financial statements.
 
     Reliance on Estimates: The preparation of financial statements in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the amounts reported in the financial
statements and the accompanying notes. Actual results could differ from those
estimates.
 
 2. SHORT-TERM INVESTMENTS
 
     The following is a summary of short-term investments classified as
available-for-sale securities:
<TABLE>
<CAPTION>
                                             DECEMBER 31, 1997                       DECEMBER 31, 1996
                            ---------------------------------------------------   ------------------------
                                            GROSS        GROSS       ESTIMATED                    GROSS
                             AMORTIZED    UNREALIZED   UNREALIZED      FAIR        AMORTIZED    UNREALIZED
                               COST         GAINS        LOSSES        VALUE         COST         GAINS
                            -----------   ----------   ----------   -----------   -----------   ----------
<S>                         <C>           <C>          <C>          <C>           <C>           <C>
US Government
  securities..............  $11,974,539    $54,201      $     --    $12,028,740   $ 7,973,645    $ 24,706
Certificates of deposit...      246,639         --            --        246,639       484,022          --
Commercial paper..........    9,850,123         --            --      9,850,123     3,972,292          --
Corporate debt
  securities..............   37,143,192      3,590       (59,779)    37,087,003    46,123,024      80,288
Other.....................      104,102      4,488            --        108,590            --          --
                            -----------    -------      --------    -----------   -----------    --------
    Total debt
      securities..........  $59,318,595    $62,279      $(59,779)   $59,321,095   $58,552,983    $104,994
                            ===========    =======      ========    ===========   ===========    ========
 
<CAPTION>
                               DECEMBER 31, 1996
                            ------------------------
                              GROSS       ESTIMATED
                            UNREALIZED      FAIR
                              LOSSES        VALUE
                            ----------   -----------
<S>                         <C>          <C>
US Government
  securities..............   $(26,388)   $ 7,971,963
Certificates of deposit...         --        484,022
Commercial paper..........         --      3,972,292
Corporate debt
  securities..............    (36,736)    46,166,576
Other.....................         --             --
                             --------    -----------
    Total debt
      securities..........   $(63,124)   $58,594,853
                             ========    ===========
</TABLE>
 
                                       38
<PAGE>   39
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
     Gross realized gains and losses were not material for any of the reported
periods. The amortized cost and estimated fair value of debt securities by
contractual maturity, are shown below.
 
<TABLE>
<CAPTION>
                                                     AMORTIZED      ESTIMATED
                                                       COST        FAIR VALUE
               AT DECEMBER 31, 1997                 -----------    -----------
<S>                                                 <C>            <C>
Due in one year or less...........................  $16,181,291    $16,206,592
Due after one year through five years.............   43,137,304     43,114,503
                                                    -----------    -----------
                                                    $59,318,595    $59,321,095
                                                    ===========    ===========
</TABLE>
 
 3. BALANCE SHEET DETAILS
 
     Other current assets at December 31, 1997 and 1996, consist of the
following:
 
<TABLE>
<CAPTION>
                                                          1997         1996
                                                       ----------    --------
<S>                                                    <C>           <C>
Interest income receivable...........................  $  779,056    $381,947
Other................................................     312,597     459,015
                                                       ----------    --------
                                                       $1,091,653    $840,962
                                                       ==========    ========
</TABLE>
 
     Property and equipment at December 31, 1997 and 1996, consist of the
following:
 
<TABLE>
<CAPTION>
                                                       1997           1996
                                                    -----------    -----------
<S>                                                 <C>            <C>
Furniture and fixtures............................  $ 1,204,534    $ 1,123,956
Equipment.........................................    4,955,553      3,738,213
Land..............................................    4,985,314             --
Leasehold improvements............................      717,094        646,939
                                                    -----------    -----------
                                                     11,862,495      5,509,108
Less accumulated depreciation and amortization....   (3,016,316)    (1,962,688)
                                                    -----------    -----------
Net property and equipment........................  $ 8,846,179    $ 3,546,420
                                                    ===========    ===========
</TABLE>
 
     Accrued liabilities at December 31, 1997 and 1996 consist of the following:
 
<TABLE>
<CAPTION>
                                                         1997          1996
                                                      ----------    ----------
<S>                                                   <C>           <C>
Accrued employee benefits...........................  $1,510,476    $  414,971
Accrued professional fees...........................     470,847       143,407
Accrued clinical trial costs........................     300,000       256,141
Income taxes payable................................     195,199       206,883
Other accrued liabilities...........................     279,830       543,487
                                                      ----------    ----------
                                                      $2,756,352    $1,564,889
                                                      ==========    ==========
</TABLE>
 
                                       39
<PAGE>   40
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
     Long-term debt at December 31, 1997 and 1996 consist of the following:
 
<TABLE>
<CAPTION>
                                                           1997        1996
                                                         --------    --------
<S>                                                      <C>         <C>
Current portion of debt:
  Note payable to bank.................................  $149,358    $     --
  Obligations under capital leases.....................   723,237     783,718
                                                         --------    --------
                                                         $872,595    $783,718
                                                         --------    --------
Long-term portion of debt:
  Note payable to bank.................................  $597,432    $     --
  Obligations under capital leases.....................   124,462     846,744
                                                         --------    --------
                                                         $721,894    $846,744
                                                         ========    ========
</TABLE>
 
     During 1997 the Company partially financed the purchase of land under a 5
year note payable for approximately $747,000, which bears interest at a floating
rate of prime plus one quarter percent (8.75% at December 31, 1997). The note is
repayable in equal monthly installments beginning February 1998.
 
 4. COMMITMENTS
 
     Leases: The Company leases its corporate and laboratory facilities under an
operating lease which expires in June 2006. Rent expense and sublease rental
revenue was approximately $2,139,000, $1,298,000, $798,000 and $917,000,
$598,000, $177,000, for the years ended December 31, 1997, 1996 and 1995,
respectively.
 
     Furniture and equipment under capital leases were approximately $3,287,000
and $3,368,000 at December 31, 1997 and 1996, respectively. Accumulated
depreciation of furniture and equipment under capital leases totaled
approximately $2,226,000 and $1,679,000 at December 31, 1997 and 1996,
respectively.
 
     Future minimum payments at December 31, 1997 are as follows:
 
<TABLE>
<CAPTION>
                                      CAPITAL      OPERATING
                                       LEASES       LEASES
                                      --------    -----------
<S>                                   <C>         <C>
1998................................  $758,411    $ 2,276,327
1999................................   129,239      3,698,216
2000................................        --      3,832,587
2001................................        --      3,971,926
2002................................        --      4,116,419
Thereafter..........................        --     44,927,206
                                      --------    -----------
          Total minimum payments....  $887,650    $62,822,681
                                                  ===========
Amount representing interest........    39,951
                                      --------
Present value of net minimum
  payments..........................   847,699
Less current portion................   723,237
                                      --------
Long-term obligations under capital
  leases............................  $124,462
                                      ========
</TABLE>
 
     In May 1997, the Company purchased two adjacent parcels of land in San
Diego for approximately $5.0 million in cash. The Company sold one parcel to a
third party in 1997, but expects to repurchase the land and lease the parcel to
Science Park Center LLC, a California limited liability company (the "LLC"), of
which the Company owns a minority interest. The LLC will construct an expanded
laboratory and office complex which will be leased by the Company under a 15
year operating lease. The Company has the option
 
                                       40
<PAGE>   41
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
to purchase the facility at any time during the lease at a predetermined price.
The remaining parcel will be held by the Company until such time as the
Company's growth requires additional expansion.
 
     Future minimum rental income to be received under non-cancelable subleases
at December 31, 1997 will be $512,257, $527,625, $543,453 and $559,757 for the
years ending December 31, 1998 through 2001, respectively.
 
     Licensing and Research Agreements: The Company has entered into licensing
agreements with various universities and research organizations. Under the terms
of these agreements, the Company has received licenses to technology, or
technology claimed, in certain patents or patent applications. The Company is
required to pay royalties on future sales of products employing the technology
or falling under claims of a patent, and, certain agreements require minimum
royalty payments. Certain agreements also require the Company to make payments
of up to an aggregate of approximately $4.9 million upon the achievement of
specified milestones.
 
 5. STOCKHOLDERS' EQUITY
 
     Common Stock Issuances: Since its inception, the Company has issued Common
Stock in various private and public offerings as well as to corporate
collaborators at prices between $5.00 and $10.50 per share resulting in
aggregate net proceeds of approximately $78.6 million.
 
     Options: The Company has reserved 4,100,000 and 100,000 shares of Common
Stock for issuance upon exercise of options or stock purchase rights granted
under the 1992 Incentive Stock Option Plan ("The Plan") and 1996 Director Option
Plan ("The Director Plan"), respectively. These plans provide for the grant of
stock options and stock purchase rights to officers, directors, and employees
of, and consultants and advisors to, the Company. Options under both plans have
terms of up to 10 years from the date of grant and may be designated as
incentive stock options or nonstatutory stock options under the Plan, and as
nonstatutory options under The Director Plan.
 
     Pro forma information regarding net income (loss) and net income (loss) per
share is required by SFAS No. 123, and has been determined as if the Company had
accounted for its employee stock options under the fair value method of that
Statement. The fair value for these options was estimated at the date of grant
using a Black-Scholes option pricing model using the following weighted-average
assumptions for 1997, 1996 and 1995, respectively: risk-free interest rates of
5.8%, 6.1% and 6.1%; a dividend yield of 0.0% (for all years), volatility
factors of the expected market price of the Company's common stock of .43, .41,
and .41; and a weighted average expected life of the option of 5 years (for all
years).
 
     For purposes of pro forma disclosures, the estimated fair value of the
options granted is amortized to expense over the options' vesting period. The
Company's pro forma information for the years ended December 31, 1997, 1996 and
1995 follows:
 
<TABLE>
<CAPTION>
                                                           1997      1996      1995
                                                          ------    ------    -------
<S>                                                       <C>       <C>       <C>
Pro forma net income (loss) (in thousands)..............  $4,364    $5,375    $(3,474)
Pro forma income (loss) per share (diluted).............  $ 0.24    $ 0.33    $ (0.30)
</TABLE>
 
     The pro forma effect on net income for 1997 and 1996 and net loss for 1995
is not likely to be representative of the effects on reported income or loss in
future years because these amounts reflect less than full vesting for options
granted during these periods.
 
                                       41
<PAGE>   42
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
     A summary of the Company's stock option activity, and related information
for the years ended December 31 follows:
 
<TABLE>
<CAPTION>
                                    1997                              1996                              1995
                       -------------------------------   -------------------------------   -------------------------------
                                          WEIGHTED-                                                           WEIGHTED-
                          OPTIONS          AVERAGE          OPTIONS          WEIGHTED         OPTIONS          AVERAGE
                       (IN THOUSANDS)   EXERCISE PRICE   (IN THOUSANDS)   EXERCISE PRICE   (IN THOUSANDS)   EXERCISE PRICE
                       --------------   --------------   --------------   --------------   --------------   --------------
<S>                    <C>              <C>              <C>              <C>              <C>              <C>
Outstanding --
  beginning of
  year...............      1,739            $4.48            1,415            $3.61              906            $3.22
Granted
  (below market).....        275            $7.43              255            $6.90              638            $4.28
Granted
  (at market)........        797            $8.02              123            $9.30               --               --
Exercised............       (100)           $4.10              (11)           $3.60               --               --
Forfeited............        (58)           $5.88              (43)           $4.41             (129)           $4.18
                           -----            -----            -----            -----            -----            -----
Outstanding -- year
  end................      2,653            $5.85            1,739            $4.48            1,415            $3.61
                           =====            =====            =====            =====            =====            =====
</TABLE>
 
     A summary of options outstanding as of December 31, 1997 follows:
 
<TABLE>
<CAPTION>
   OPTIONS          EXERCISE         WEIGHTED-         WEIGHTED-          OPTIONS          EXERCISE         WEIGHTED-
 OUTSTANDING          PRICE           AVERAGE           AVERAGE         OUTSTANDING          PRICE           AVERAGE
(IN THOUSANDS)        RANGE        EXERCISE PRICE   CONTRACTUAL LIFE   (IN THOUSANDS)        RANGE        EXERCISE PRICE
- --------------   ---------------   --------------   ----------------   --------------   ---------------   --------------
<C>              <C>               <C>              <C>                <S>              <C>               <C>
      515             $2.50            $2.50           5.6 years          515                $2.50            $2.50
      807        $4.25 to $5.95        $4.42           7.2 years          536           $4.25 to $5.95        $4.41
    1,331        $6.91 to $10.25       $8.02           9.2 years          218           $6.91 to $10.25       $8.17
</TABLE>
 
     Warrants: The Company has outstanding warrants to purchase 531,465 shares
of Common Stock at exercise prices of $5.00 and $10.50 per share. The warrants
generally expire between 1998 and 2007. At December 31, 1997, all outstanding
warrants were exercisable.
 
     Employee Stock Purchase Plan: The Company has reserved 125,000 shares of
Common Stock for issuance under the 1996 Employee Stock Purchase Plan (the
"Purchase Plan"). The Purchase Plan permits eligible employees to purchase
Common Stock through payroll deductions at a purchase price equal to 85% of the
lesser of the fair market value per share of Common Stock on the start date of
an offering period or on the date on which the shares are purchased. Through
December 31, 1997, 21,533 shares had been issued pursuant to the Purchase Plan.
 
     Shares reserved for future issuances:
 
<TABLE>
<S>                                                         <C>
Stock options.............................................  2,640,901
Warrants..................................................    531,465
Employee stock purchase plan..............................    103,467
Director option plan......................................    100,000
                                                            ---------
          Total...........................................  3,375,833
                                                            =========
</TABLE>
 
     Of the shares available for future issuance under the Plan, 2,603,174 are
outstanding grants and 37,727 remain available for future grant.
 
6. COLLABORATIVE RESEARCH AND DEVELOPMENT AGREEMENTS
 
     Janssen: In January 1995, the Company entered into a research and
development agreement (the "Janssen Agreement") with Janssen, under which
Janssen paid the Company $2.0 million in up-front license
 
                                       42
<PAGE>   43
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
fees and $3.7 million, $3.0 million and $3.0 million in sponsored research
payments in 1997, 1996 and 1995, respectively.
 
     Under the Janssen Agreement, Neurocrine is entitled to receive up to $10.0
million in milestone payments for the indications of anxiety, depression and
substance abuse, and up to $9.0 million in milestone payments for other
indications, if certain development milestones are achieved; $1.5 million, $1.0
million and $750,000 was received in 1997, 1996 and 1995, respectively. The
Company has granted Janssen an exclusive worldwide license to manufacture and
market products developed under the Janssen Agreement. The Company is entitled
to receive royalties on product sales throughout the world. The Company has
certain rights to co-promote such products in North America. Janssen is
responsible for funding all clinical development and marketing activities,
including reimbursement to Neurocrine for its promotional efforts, if any.
 
     The collaborative research portion of the agreement was completed as
scheduled in 1997 with the selection of a clinical candidate and the
commencement of clinical trials in Europe. The Company may continue to receive
milestone payments and royalties upon the successful continuation of the
development portion of the agreement.
 
     Janssen has the right to terminate the Agreement upon six months notice.
However, in the event of termination, other than termination by Janssen for
cause or as a result of the acquisition of Neurocrine, all product and
technology rights become the exclusive property of Neurocrine.
 
     Novartis: In January 1996, the Company entered into an agreement with
Novartis under which Novartis paid the Company $5.0 million in up-front fees and
is obligated to provide Neurocrine with $7.0 million in research and development
funding during the first two years of the agreement and up to $15.5 million in
further research and development funding thereafter. The Company received $7.2
million and $3.5 million of research and development funding in 1997 and 1996,
respectively. In addition, the Company is also entitled to receive milestone
payments if certain development and regulatory milestones are achieved, of which
$3.8 million and $3.0 million was received in 1997 and 1996, respectively. In
return, Novartis received manufacturing and marketing rights outside of North
America and will receive a percentage of profits on any sales in North America.
The Company will receive royalties for all sales which may occur outside North
America and a percentage of profits on sales in North America, which the Company
may at its option convert to a right to receive royalties on product sales.
Neurocrine is obligated to repay a portion of the development costs for
potential products developed in such collaboration unless the Company elects to
convert to the right to receive royalty payments. Novartis has the right to
terminate the agreement on six months notice.
 
     Eli Lilly: In October 1996, the Company entered into an agreement with Eli
Lilly and Company ("Eli Lilly") under which the Company expects to receive $22.0
million in research payments. The Company is also entitled to milestone payments
if certain development and regulatory accomplishments are achieved. Eli Lilly
paid the Company $9.1 million and $1.3 million in research payments in 1997 and
1996, respectively. The Company will have the option to receive co-promotion
rights and share profits from commercial sales of select products, which may
result from the collaboration in the U.S. or receive royalties on U.S. product
sales. The Company will receive royalties on any product sales for the rest of
the world.
 
                                       43
<PAGE>   44
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
 7. NEUROSCIENCE PHARMA, INC. (NPI)
 
     In March 1996, the Company established Neuroscience Pharma, Inc. ("NPI")
with a group of Canadian institutional investors (the "Canadian Investors"). The
Company licensed to NPI certain technology, which had no accounting basis, and
Canadian marketing rights to such technology, for 49% of the Common Stock of
NPI. The Canadian Investors invested approximately $9.5 million cash in NPI in
exchange for Preferred Stock of NPI, as well as a 51% ownership interest in
NPI's Common Stock. The Preferred Stock was exchangeable at the option of the
Canadian Investors into approximately 1,279,758 shares of the Company's Common
Stock, using an exchange ratio based on the assumed fair value of the Company's
Common Stock in March 1996. NPI has committed to use these funds for research
and clinical development of certain of the Company's programs in exchange for
royalties on sales of products developed in these programs as well as exclusive
Canadian marketing rights for such products in certain situations. The Company
has the right to terminate the agreement under certain conditions by purchasing
the shares of NPI Preferred Stock held by the Canadian Investors in exchange for
cash or the Company's Common Stock at a predetermined price.
 
     In December 1997, certain of the Canadian Investors exchanged their NPI
Preferred Stock into 600,502 shares of the Company's Common Stock. The Company
recorded the issuance of its equity at the agreed-upon exchange rate, which
approximated the fair market value of the Company's Common Stock at such date,
and recorded an investment of $4,473,740 in NPI.
 
     In accordance with the equity method of accounting, the Company has
recognized $1,130,000 of research and development expense, representing its
share of NPI's losses since inception, of which $970,000 relates to 1997 and
$160,000 relates to 1996.
 
     As of December 31, 1997, NPI has total assets of approximately $6.9
million, consisting primarily of cash, cash equivalents and short-term
investments. The Company's investment in NPI is carried at approximately $3.3
million.
 
     In connection with their investment in NPI, the Canadian Investors also
received warrants exercisable for 383,875 shares of the Company's Common Stock
at an exercise price of $10.50 per share and are eligible to receive additional
warrants in the future upon attainment of certain Canadian government incentives
for research activities.
 
 8. INCOME TAXES
 
     At December 31, 1997, the Company had federal income tax net operating loss
and research tax credit carryforwards of approximately $2.8 million and
$935,000, respectively, which will begin to expire in 2007 unless utilized. The
Company also has federal Alternative Minimum Tax credit carryforwards of
approximately $241,000, which will carryforward indefinitely.
 
     Pursuant to Internal Revenue Code Sections 382 and 383, annual use of the
Company's net operating loss and credit carryforwards may be limited because of
cumulative changes in ownership of more than 50% which occurred during 1992 and
1993. However, the Company does not believe such changes will have a material
impact upon the utilization of these carryforwards.
 
                                       44
<PAGE>   45
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
     Significant components of the Company's deferred tax assets as of December
31, 1997 and 1996 are shown below. A valuation allowance of $3,474,000 and
$4,647,000 at December 31, 1997 and 1996, respectively, have been recognized to
offset the net deferred tax assets, as realization of such assets is uncertain.
 
<TABLE>
<CAPTION>
                                                               1997           1996
                                                            -----------    -----------
<S>                                                         <C>            <C>
Deferred tax assets:
  Net operating loss carryforwards........................  $   993,000    $ 3,038,000
  Tax credit carryforwards................................    1,176,000        946,000
  Capitalized research and development....................      525,000        594,000
  Other, net..............................................      780,000         69,000
                                                            -----------    -----------
          Total deferred tax assets.......................    3,474,000      4,647,000
Valuation allowance for deferred tax assets...............   (3,474,000)    (4,647,000)
                                                            -----------    -----------
Net deferred tax assets...................................  $        --    $        --
                                                            ===========    ===========
</TABLE>
 
     The provision for income taxes on earnings subject to income taxes differs
from the statutory federal rate at December 31, 1997 and 1996, due to the
following:
 
<TABLE>
<CAPTION>
                                                                 1997          1996
                                                              ----------    ----------
<S>                                                           <C>           <C>
Federal income taxes at 34%.................................  $1,816,000    $2,081,000
State income tax, net of federal benefit....................      86,787            --
Tax effect on non-deductible expenses.......................      21,000        17,000
Benefit of net operating loss carryforwards.................  (1,837,000)   (2,098,000)
Alternative minimum taxes...................................     127,301       247,683
                                                              ----------    ----------
                                                              $  214,088    $  247,683
                                                              ==========    ==========
</TABLE>
 
     The provision for taxes based on income at December 31, 1997 and 1996,
consists of the following:
 
<TABLE>
<CAPTION>
                                           1997        1996
                                         --------    --------
<S>                                      <C>         <C>
Current
  Federal..............................  $127,301    $247,683
  State................................    86,787          --
Deferred
  Federal..............................        --          --
  State................................        --          --
                                         --------    --------
          Total........................  $214,088    $247,683
                                         ========    ========
</TABLE>
 
                                       45
<PAGE>   46
                          NEUROCRINE BIOSCIENCES, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
                               DECEMBER 31, 1997
 
 9. EARNINGS PER SHARE
 
     The following data show the amounts used in computing earnings per share
and the effect on income and the weighted-average number of shares of dilutive
potential common stock, as of the years ended December 31.
 
<TABLE>
<CAPTION>
                                                 1997           1996           1995
                                              -----------    -----------    -----------
<S>                                           <C>            <C>            <C>
Numerator:
  Net income (loss).........................  $ 5,126,844    $ 5,873,920    $(3,346,390)
  Effect of dilutive securities.............           --             --             --
                                              -----------    -----------    -----------
  Numerator for earnings (loss) per share...    5,126,844      5,873,920     (3,346,390)
Denominator:
  Denominator for basic earnings (loss) per
     share..................................   16,929,925     14,970,734     11,683,877
  Effect of dilutive securities:
     Employee stock options.................      909,264        795,697    Antidilutive
     Convertible preferred stock............      203,998        182,964    Antidilutive
     Warrants...............................      141,271        177,639    Antidilutive
                                              -----------    -----------    -----------
  Dilutive potential of common shares.......    1,254,533      1,156,300             --
                                              -----------    -----------    -----------
  Denominator for diluted earnings (loss)
     per share..............................   18,184,458     16,127,034     11,683,877
                                              ===========    ===========    ===========
  Basic earnings (loss) per share...........  $      0.30    $      0.39    $     (0.29)
                                              ===========    ===========    ===========
  Diluted earnings (loss) per share.........  $      0.28    $      0.36    $     (0.29)
                                              ===========    ===========    ===========
</TABLE>
 
10. SUBSEQUENT EVENT
 
     On February 27, 1998, the Company signed a letter of intent to acquire
Northwest NeuroLogic, Inc., an Oregon-based corporation, in a 100% stock
transaction valued at approximately $4.0 million.
 
                                       46
<PAGE>   47
 
                               INDEX OF EXHIBITS
 
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER                            DESCRIPTION
    -------                           -----------
    <C>       <S>
      3.1     Restated Certificate of Incorporation.(1)
      3.2     Bylaws.(1)
      3.3     Certificate of Amendment of Bylaws.
      4.1     Form of Lock-Up Agreement.(1)
      4.2     Form of Common Stock Certificate.(1)
      4.3     Form of warrant issued to existing warrant holders.(1)
      4.4     Form of Series A warrant issued in connection with the
              execution by the Company of the Unit Purchase Agreement (see
              below).(1)
      4.5     New Registration Rights Agreement dated March 29, 1996 among
              the Company and the investors signatory thereto.(1)
      4.6     Letter of Intent between Northwest NeuroLogic, Inc. and the
              Company dated February 27, 1998.(2)
     10.1     Purchase and Sale Agreement and Escrow Instructions between
              MS Vickers II, LLC and the Company dated February 13,
              1997.(3)
     10.2     1992 Incentive Stock Plan, as amended.
     10.3     1996 Employee Stock Purchase Plan.(1)
     10.4     1996 Director Stock Option Plan and form of stock option
              agreement.(1)
     10.5     Form of Director and Officer Indemnification Agreement.(1)
     10.6     Employment Agreement dated March 1, 1997, between the
              Registrant and Gary A. Lyons, as amended.(4)
     10.7     Employment Agreement dated March 1, 1997, between the
              Registrant and Errol B. De Souza, Ph.D.(4)
     10.8     Employment Agreement dated March 1, 1997, between the
              Registrant and Paul W. Hawran.(4)
     10.9     Employment Agreement dated March 1, 1997, between the
              Registrant and Stephen Marcus, M.D.
     10.10    Consulting Agreement dated September 25, 1992, between the
              Registrant and Wylie A. Vale, Ph.D.(1)
     10.11    Consulting Agreement effective as of January 1, 1992,
              between the Registrant and Lawrence J. Steinman, M.D.(1)
     10.12    Lease Agreement dated June 1, 1993, between the Registrant
              and Hartford Accident and Indemnity Company, as amended.(1)
     10.13    Exclusive License Agreement dated as of July 1, 1993, by and
              between the Beckman Research Institute of the City of Hope
              and the Registrant covering the treatment of nervous system
              degeneration and Alzheimer's disease.(1)
     10.14    Exclusive License Agreement dated as of July 1, 1993, by and
              between the Beckman Research Institute of the City of Hope
              and the Registrant covering the use of Pregnenolone for the
              enhancement of memory.(1)
     10.15    License Agreement dated May 20, 1992, by and between The
              Salk Institute for Biological Studies and the Registrant.(1)
     10.16    License Agreement dated July 17, 1992, by and between The
              Salk Institute for Biological Studies and the Registrant.(1)
</TABLE>
<PAGE>   48
 
<TABLE>
<CAPTION>
    EXHIBIT
    NUMBER                            DESCRIPTION
    -------                           -----------
    <C>       <S>
     10.17    License Agreement dated November 16, 1993, by and between
              The Salk Institute for Biological Studies and the
              Registrant.(1)
     10.18    License Agreement dated October 19, 1992, by and between The
              Board of Trustees of the Leland Stanford Junior University
              and the Registrant.(1)
     10.19    Agreement dated January 1, 1995, by and between the
              Registrant and Janssen Pharmaceutica, N.V.(1)
     10.20    Letter Agreement dated January 19, 1996, by and between the
              Registrant and Ciba-Geigy Limited.(1)
     10.21+   Unit Purchase Agreement dated March 29, 1996, by and between
              Neuroscience Pharma (NPI) Inc., the Registrant and the
              investors signatory thereto.(1)
     10.22+   Exchange Agreement dated March 29, 1996, by and between
              Neurocrine Biosciences (Canada) Inc., the Registrant and the
              investors signatory thereto.(1)
     10.23+   Research and Development Agreement dated March 29, 1996, by
              and between Neurocrine Biosciences (Canada) Inc. and
              Neuroscience Pharma (NPI) Inc.(1)
     10.24+   Intellectual Property and License Grants Agreement dated
              March 29, 1996, by and between the Registrant and Neurocrine
              Biosciences (Canada) Inc.(1)
     10.25+   Development and Commercialization Agreement dated December
              20, 1996, by and between Ciba-Geigy Ltd. and the
              Registrant.(5)
     10.26+   Letter and Purchase Order dated June 7, 1996, by and between
              Ciba-Geigy and the Registrant.(5)
     10.27    Third Lease Amendment dated June 6, 1996, by and between
              Talcott Realty I Limited Partnership and the Registrant.(5)
     10.28+   Research and License Agreement dated October 15, 1996,
              between the Registrant and Eli Lilly and Company.(5)
     10.29+   Lease between Science Park Center LLC and the Company.(6)
     10.30+   Option Agreement between Science Park Center LLC (Optionor)
              and the Company (Optionee).(6)
     10.31+   Construction Loan Agreement.(6)
     10.32    Secured Promissory Note.(6)
     10.33+   Operating Agreement for Science Park Center LLC.(6)
     10.34    Information and Registration Rights Agreement dated
              September 15, 1992, as amended to date.(1)
     10.35    Form of incentive stock option agreement and nonstatutory
              stock option agreement for use in connection with 1992
              Incentive Stock Plan.(1)
     21       Subsidiaries of the Company.
     23       Consent of Ernst & Young LLP, Independent Auditors.
     24       Power of Attorney (reference is made to the following page
              of this Form 10-K).
     27.1     Financial Data Schedule for the fiscal year ended December
              31, 1997.
     27.2     Financial Data Schedule for the fiscal year ended December
              31, 1996.
</TABLE>
 
- ---------------
(1) Incorporated by reference to the Company's Registration Statement on Form
    S-1 (Registration No. 333-03172).
 
(2) Incorporated by reference to the Company's Report on Form 8-K filed on March
    13, 1998.
 
(3) Incorporated by reference to the Company's amended Quarterly Report on Form
    10-Q filed on August 15, 1997.
<PAGE>   49
 
(4) Incorporated by reference to the Company's Quarterly Report on Form 10-Q
    filed on August 14, 1997.
 
(5) Incorporated by reference to the Company's Report on Form 10-K for the
    fiscal year ended December 31, 1996, as amended.
 
(6) Incorporated by reference to the Company's Quarterly Report on Form 10-Q
    filed on November 14, 1997.
 
 *  Confidential treatment has been requested with respect to certain portions
    of the exhibit.
 
 +  Confidential treatment has been granted with respect to certain portions of
    the exhibit.

<PAGE>   1
                                                                     Exhibit 3.3


                           CERTIFICATE OF AMENDMENT OF
                                    BYLAWS OF
                          NEUROCRINE BIOSCIENCES, INC.
                            (A Delaware Corporation)

      On May 27, 1997, the stockholders of the corporation approved the
amendment of Section 3.2 of the Bylaws of the corporation to read as follows:

      3.2   NUMBER OF DIRECTORS

      The board of directors shall consist of seven (7) members. The number of
      directors may be changed by an amendment to this bylaw, duly adopted by
      the board of directors or by the stockholders, or by a duly adopted
      amendment to the certificate of incorporation. The directors shall be
      divided into three classes, with the term of office of the first class,
      which class shall initially consist of two directors, to expire at the
      first annual meeting of stockholders following the 1996 Annual Meeting of
      Shareholders; the term of office of the second class, which class shall
      initially consist of two directors, to expire at the second annual meeting
      of stockholders following the 1996 Annual Meeting of Shareholders; the
      term of office of the third class, which class shall initially consist of
      two directors, to expire at the third annual meeting of stockholders
      following the 1996 Annual Meeting of Shareholders; and thereafter for each
      such term to expire at each third succeeding annual meeting of
      stockholders held after such election.



<PAGE>   1
                                                                    Exhibit 10.2


                          NEUROCRINE BIOSCIENCES, INC.

                        AMENDED 1992 INCENTIVE STOCK PLAN

1.    Purpose of the Plan. The purposes of this Incentive Stock Plan are to
      attract and retain the best available personnel, to provide additional
      incentive to the employees of Neurocrine Biosciences, Inc. (the "Company")
      and to promote the success of the Company's business.

      Options granted hereunder may be either Incentive Stock Options or
Nonstatutory Stock Options, at the discretion of the Board and as reflected in
the terms of the written option agreement. The Board also has the discretion to
grant Stock Purchase Rights.

2.    Definitions.

      a.    "Board" shall mean the Committee, if one has been appointed, or the
            Board of Directors of the Company, if no Committee is appointed.

      b.    "Code" shall mean the Internal Revenue Code of 1986, as amended.

      c.    "Committee" shall mean the Committee appointed by the Board of
            Directors in accordance with Section 4(a) of the Plan, if one is
            appointed.

      d.    "Common Stock" shall mean the Common Stock of the Company.

      e.    "Company" shall mean Neurocrine Biosciences, Inc.

      f.    "Consultant" shall mean any person who is engaged by the Company or
            any Parent or Subsidiary to render consulting services and is
            compensated for such consulting services, and any director of the
            Company whether compensated for such services or not.

      g.    "Continuous Status as an Employee or Consultant" shall mean the
            absence of any interruption or termination of service as an Employee
            or Consultant, as applicable. Continuous Status as an Employee or
            Consultant shall not be considered interrupted in the case of sick
            leave, military leave, or any other leave of absence approved by the
            Board; provided that such leave is for a period of not more than 90
            days or reemployment upon the expiration of such leave is guaranteed
            by contract or statute.

      h.    "Employee" shall mean any persons, including officers and directors,
            employed by the Company or any Parent or Subsidiary of the Company.
            The payment of a director's fee by the Company shall not be
            sufficient to constitute "employment" by the Company.

      i.    "Incentive Stock Option" shall mean an Option intended to qualify as
            an incentive stock option within the meaning of Section 422 of the
            Code.

      j.    "Nonstatutory Stock Option" shall mean an Option not intended to
            qualify as an Incentive Stock Option.

      k.    "Option" shall mean a stock option granted pursuant to the Plan.

      l.    "Optioned Stock" shall mean the Common Stock subject to an Option or
            Stock Purchase Right.


<PAGE>   2
      m.    "Optionee" shall mean an Employee or Consultant who receives an
            Option.

      n.    "Parent" shall mean a "parent corporation," whether now or hereafter
            existing, as defined in Section 424(e) of the Code.

      o.    "Plan" shall mean this 1992 Incentive Stock Plan.

      p.    "Purchaser" shall mean an Employee or Consultant who exercises a
            Stock Purchase Right.

      q.    "Share" shall mean a share of the Common Stock, as adjusted in
            accordance with Section 11 of the Plan.

      r.    "Stock Purchase Right" shall mean a right to purchase Common Stock
            pursuant to the Plan or the right to receive a bonus of Common Stock
            for past services.

      s.    "Subsidiary" shall mean a "subsidiary corporation," whether now or
            hereafter existing, as defined in Section 424(f) of the Code.

3.    Stock Subject to the Plan. Subject to the provisions of Section 11 of the
      Plan, the maximum aggregate number of shares under the Plan is 4,100,000
      shares of Common Stock. The Shares may be authorized but unissued, or
      reacquired Common Stock.

      If an Option or Stock Purchase Right should expire or become unexercisable
for any reason without having been exercised in full, then the unpurchased
Shares which were subject thereto shall, unless the Plan shall have been
terminated, become available for future grant or sale under the Plan.
Notwithstanding any other provision of the Plan, shares issued under the Plan
and later repurchased by the Company shall not become available for future grant
or sale under the Plan.

4.    Administration of the Plan.

      a.    Procedure.

            i.    Multiple Administrative Bodies. The Plan may be administered
                  by different Committees with respect to different groups of
                  Employees and Consultants.

            ii.   Section 162(m). To the extent that the Administrator
                  determines it to be desirable to qualify Options granted
                  hereunder as "performance-based compensation" within the
                  meaning of Section 162(m) of the Code, the Plan shall be
                  administered by a Committee of two or more "outside directors"
                  within the meaning of Section 162(m) of the Code.

            iii.  Rule 16b-3. To the extent desirable to qualify transactions
                  hereunder as exempt under Rule 16b-3, the transactions
                  contemplated hereunder shall be structured to satisfy the
                  requirements for exemption under Rule 16b-3.

            iv.   Other Administration. Other than as provided above, the Plan
                  shall be administered by (A) the Board or (B) a Committee,
                  which committee shall be constituted to satisfy applicable
                  laws.

      b.    Powers of the Board. Subject to the provisions of the Plan, the
            Board shall have the authority, in its discretion: (i) to grant
            Incentive Stock Options, Nonstatutory Stock Options or Stock
            Purchase Rights; (ii) to determine, upon review of relevant
            information and in accordance with

<PAGE>   3
            Section 7 of the Plan, the fair market value of the Common Stock;
            (iii) to determine the exercise price per share of Options or Stock
            Purchase Rights, to be granted, which exercise price shall be
            determined in accordance with Section 7 of the Plan; (iv) to
            determine the Employees or Consultants to whom, and the time or
            times at which, Options or Stock Purchase Rights shall be granted
            and the number of shares to be represented by each Option or Stock
            Purchase Right; (v) to interpret the Plan; (vi) to prescribe, amend
            and rescind rules and regulations relating to the Plan; (vii) to
            determine the terms and provisions of each Option and Stock Purchase
            Right granted (which need not be identical) and, with the consent of
            the holder thereof, modify or amend any provisions (including
            provisions relating to exercise price) of any Option or Stock
            Purchase Right; (viii) to accelerate or defer (with the consent of
            the Optionee) the exercise date of any Option, consistent with the
            provisions of Section 5 of the Plan; (ix) to authorize any person to
            execute on behalf of the Company any instrument required to
            effectuate the grant of an Option or Stock Purchase Right previously
            granted by the Board; (x) to allow Optionees to satisfy withholding
            tax obligations by electing to have the Company withhold from the
            Shares to be issued upon exercise of an Option or Stock Purchase
            Right that number of Shares having a Fair Market Value equal to the
            amount required to be withheld. The Fair Market Value of the Shares
            to be withheld shall be determined on the date that the amount of
            tax to be withheld is to be determined. All elections by an Optionee
            to have Shares withheld for this purpose shall be made in such form
            and under such conditions as the Administrator may deem necessary or
            advisable; and (xi) to make all other determinations deemed
            necessary or advisable for the administration of the Plan.

      c.    Effect of Board's Decision. All decisions, determinations and
            interpretations of the Board shall be final and binding on all
            Optionees, Purchasers and any other holders of any Options or Stock
            Purchase Rights granted under the Plan.

5.    Eligibility.

      a.    Options and Stock Purchase Rights may be granted to Employees and
            Consultants, provided that Incentive Stock Options may only be
            granted to Employees. An Employee or Consultant who has been granted
            an Option or Stock Purchase Right may, if such Employee or
            Consultant is otherwise eligible, be granted additional Option(s) or
            Stock Purchase Right(s).

      b.    Each Option shall be designated in the written option agreement as
            either an Incentive Stock Option or a Nonstatutory Stock Option.
            However, notwithstanding such designation, to the extent that the
            aggregate fair market value of the Shares with respect to which
            Options designated as Incentive Stock Options are exercisable for
            the first time by any Optionee during any calendar year (under all
            plans of the Company) exceeds $100,000, such Options shall be
            treated as Nonstatutory Stock Options.

      c.    For purposes of Section 5(b), Options shall be taken into account in
            the order in which they were granted, and the fair market value of
            the Shares shall be determined as of the time the Option with
            respect to such Shares is granted.

      d.    The Plan shall not confer upon any Optionee or holder of a Stock
            Purchase Right any right with respect to continuation of employment
            by or the rendition of consulting services to the Company, nor shall
            it interfere in any way with his or her right or the Company's right
            to terminate his or her employment or services at any time, with or
            without cause.

      e.    The following limitations shall apply to grants of Options to
            Employees:


<PAGE>   4
            i.    No Employee shall be granted, in any fiscal year of the
                  Company, Options to purchase more than 250,000 Shares.

            ii.   In connection with his or her initial employment, an Employee
                  may be granted Options to purchase up to an additional 250,000
                  Shares which shall not count against the limit set forth in
                  subsection (i) above.

            iii.  The foregoing limitations shall be adjusted proportionately in
                  connection with any change in the Company's capitalization as
                  described in Section 11.

            iv.   If an Option is canceled in the same fiscal year of the
                  Company in which it was granted (other than in connection with
                  a transaction described in Section 12), the canceled Option
                  shall be counted against the limit set forth in subsection (i)
                  above. For this purpose, if the exercise price of an Option is
                  reduced, such reduction will be treated as a cancellation of
                  the Option and the grant of a new Option.

6.    Term of Plan. The Plan shall become effective upon the earlier to occur of
      its adoption by the Board of Directors or its approval by vote of holders
      of a majority of the outstanding shares of the Company entitled to vote on
      the adoption of the Plan. It shall continue in effect for a term of ten
      (10) years unless sooner terminated under Section 13 of the Plan.

7.    Exercise Price and Consideration.

      a.    The per Share exercise price for the Shares to be issued pursuant to
            exercise of an Option or Stock Purchase Right shall be such price as
            is determined by the Board, but shall be subject to the following:

            i.    In the case of an Incentive Stock Option;

                      (1)    granted to an Employee who, at the time of grant of
                             such Incentive Stock Option, owns stock
                             representing more than ten percent (10%) of the
                             voting power of all classes of stock of the Company
                             or any Parent or Subsidiary, the per Share exercise
                             price shall be no less than 110% of the fair market
                             value per Share on the date of grant.

                      (2)    granted to any other Employee, the per Share
                             exercise price shall be no less than 100% of the
                             fair market value per Share on the date of grant.

            ii.   In the case of a Nonstatutory Stock Option or a Stock Purchase
                  Right, the per Share exercise price shall be no less than 85%
                  of the fair market value per Share on the date of grant. In
                  the case of a Nonstatutory Stock Option intended to qualify as
                  "performance-based compensation" within the meaning of Section
                  162(m) of the Code, the per Share exercise price shall be no
                  less than 100% of the Fair Market Value per Share on the date
                  of grant.

            iii.  Notwithstanding the foregoing, Options may be granted with a
                  per Share exercise price of less than 100% of the Fair Market
                  Value per Share on the date of grant pursuant to a merger or
                  other corporate transaction.

            For purposes of this Section 7(a), in the event that an Option or
Stock Purchase Right is amended to reduce the exercise price, the date of grant
of such Option or Stock Purchase Right shall thereafter be considered to be the
date of such amendment.


<PAGE>   5
      b.    The fair market value shall be determined by the Board in its
            discretion; provided, however, that where there is a public market
            for the Common Stock, the fair market value per Share shall be the
            mean of the bid and asked prices (or the closing price per share if
            the Common Stock is listed on the National Association of Securities
            Dealers Automated Quotation ("NASDAQ") National Market System) of
            the Common Stock for the date of grant, as reported in the Wall
            Street Journal (or, if not so reported, as otherwise reported by the
            NASDAQ System) or, in the event the Common Stock is listed on a
            stock exchange, the fair market value per Share shall be the closing
            price on such exchange on the date of grant of the Option or Stock
            Purchase Right, as reported in the Wall Street Journal.

      c.    The consideration to be paid for the Shares to be issued upon
            exercise of an Option or Stock Purchase Right, including the method
            of payment, shall be determined by the Board (and in the case of an
            Incentive Stock Option, shall be determined at the time of grant)
            and may consist entirely of cash, check, promissory note, other
            Shares of Common Stock which (i) either have been owned by the
            Optionee for more than six (6) months on the date of surrender or
            were not acquired directly or indirectly, from the Company, and (ii)
            have a fair market value on the date of surrender equal to the
            aggregate exercise price of the Shares as to which said Option shall
            be exercised, or any combination of such methods of payment, or such
            other consideration and method of payment for the issuance of Shares
            to the extent permitted under Sections 408 and 409 of the California
            General Corporation Law. In making its determination as to the type
            of consideration to accept, the Board shall consider if acceptance
            of such consideration may be reasonably expected to benefit the
            Company (Section 315(b) of the California General Corporation Law).

8.    Options.

      a.    Term of Option. The term of each Option shall be the term stated in
            the Option Agreement; provided, however, that the term shall be no
            more than ten (10) years from the date of grant thereof. In the case
            of an Incentive Stock Option granted to an Optionee who, at the time
            the Option is granted, owns stock representing more than ten percent
            (10%) of the voting power of all classes of stock of the Company or
            any Parent or Subsidiary, the term of the Option shall be five (5)
            years from the date of grant thereof or such shorter term as may be
            provided in the Option Agreement.

      b.    Exercise of Option.

            i.    Procedure for Exercise; Rights as a Shareholder. Any Option
                  granted hereunder shall be exercisable at such times and under
                  such conditions as determined by the Board, including
                  performance criteria with respect to the Company and/or the
                  Optionee, and as shall be permissible under the terms of the
                  Plan, but in no case at a rate of less than 20% per year over
                  five (5) years from the date the Option is granted.

            An Option may not be exercised for a fraction of a Share.

            An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 7 of, the Plan.
Until the issuance (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares no right to vote or receive dividends or any
other rights as a shareholder shall exist with respect to the Optioned Sock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to


<PAGE>   6
be issued) such stock certificate promptly upon exercise of the Option. In the
event that the exercise of a Nonstatutory Stock Option pursuant to Section 5(b),
the Company shall issue a separate stock certificate evidencing the Shares
treated as acquired upon exercise of an Incentive Stock Option and a separate
stock certificate evidencing the Shares treated as acquired upon exercise of a
Nonstatutory Stock Option and shall identify each such certificate accordingly
in its stock transfer records. No adjustment will be made for a dividend or
other right for which the record date is prior to the date the stock certificate
is issued, except as provided in Section 11 of the Plan.

            Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

            ii.   Termination of Status as an Employee or Consultant. In the
                  event of termination of an Optionee's Continuous Status as an
                  Employee or Consultant (as the case may be), such Optionee
                  may, but only within such period of time as is determined by
                  the Board, with such determination in the case of an Incentive
                  Stock Option not exceeding three (3) months and in the case of
                  Nonstatutory Stock Option not exceeding six (6) months after
                  the date of termination, with such determination in the case
                  of an Incentive Stock Option being made at the time of grant
                  of the Option, exercise the Option to the extent that such
                  Employee or Consultant was entitled to exercise it at the date
                  of such termination (but in no event later than the date of
                  expiration of the term of such Option as set forth in the
                  Option Agreement). To the extent that such Employee or
                  Consultant was not entitled to exercise the Option at the date
                  of such termination, or if such Employee or Consultant does
                  not exercise such Option (which such Employee or Consultant
                  was entitled to exercise) within the time specified herein,
                  the Option shall terminate.

            iii.  Disability of Optionee. Notwithstanding the provisions of
                  Section 8(b)(ii) above, in the event of termination of an
                  Optionee's Continuous Status as an Employee or Consultant as a
                  result of such Employee's or Consultant's total and permanent
                  disability (as defined in Section 22(e)(3) of the Code), such
                  Employee or Consultant may, but only within six (6) months (or
                  such other period of time not exceeding twelve (12) months as
                  in determined by the Board, with such determination in the
                  case of an Incentive Stock Option being made at the time of
                  gant of the Option) from the date of such termination (but in
                  no event later than the date of expiration of the term of such
                  Option as set forth in the Option Agreement), exercise the
                  Option to the extent such Employee or Consultant was entitled
                  to exercise it at the date of such termination. To the extent
                  that such Employee or Consultant was not entitled to exercise
                  the Option at the date of termination, or if such Employee or
                  Consultant does not exercise such Option (which such Employee
                  or Consultant was entitled to exercise) within the time
                  specified herein, the Option shall terminate.

            iv.   Death of Optionee. In the event of the death of an Optionee:

                  (1)   during the term of the Option who is at the time of his
                        or her death an Employee or Consultant of the Company
                        and who shall have been in Continuous Status as an
                        Employee or Consultant since the date of grant of the
                        Option, the Option may be exercised, at any time within
                        six (6) months (but in no event later than the date of
                        expiration of the term of such Option as set forth in
                        the Option Agreement), by the Optionee's estate or by a
                        person who acquired the right to exercise the Option by
                        bequest or inheritance, but only to the extent that the
                        right to exercise would have accrued had the Optionee
                        continued living and remained in Continuous Status as an
                        Employee or Consultant six (6)


<PAGE>   7
                        months (or such other period of time as in determined by
                        the Board at the time of grant of the Option) after the
                        date of death; or

                  (2)   within thirty (30) days (or such other period of time
                        not exceeding three (3) months as is determined by the
                        Board, with such determination in the case of an
                        Incentive Stock Option being made at the time of grant
                        of the Option) after the termination of Continuous
                        Status as an Employee or Consultant, the Option may be
                        exercised, at any time within six (6) months (or such
                        other period of time as is determined by the Board at
                        the time of grant of the Option) following the date of
                        death (but in no event later than the date of expiration
                        of the term of such Option as set forth in the Option
                        Agreement), by the Optionee's estate or by a person who
                        acquired the right to exercise the Option by bequest or
                        inheritance, but only to the extent of the right to
                        exercise that had accrued at the date of termination.

9.    Stock Purchase Rights.

      a.    Rights to Purchase. After the Board of Directors determines that it
            will offer an Employee or Consultant a Stock Purchase Right, it
            shall deliver to the offeree a stock purchase agreement or stock
            bonus agreement, as the case may be, setting forth the terms,
            conditions and restrictions relating to the offer, including the
            number of Shares which such person shall be entitled to purchase,
            and the time within which such person must accept such offer, which
            shall in no event exceed six (6) months from the date upon which the
            Board of Directors or its Committee made the determination to grant
            the Stock Purchase Right. The offer shall be accepted by execution
            of a stock purchase agreement or stock bonus agreement in the from
            determined by the Board of Directors.

      b.    Issuance of Shares. Forthwith after payment therefor, the Shares
            purchased shall be duly issued; provided, however, that the Board
            may require that the Purchaser make adequate provision for any
            Federal and State withholding obligations of the Company as a
            condition to the Purchaser purchasing such Shares.

      c.    Repurchase Option. Unless the Board determines otherwise, the stock
            purchase agreement or stock bonus agreement shall grant the Company
            a repurchase option exercisable upon the voluntary or involuntary
            termination of the Purchaser's employment with the Company for any
            reason (including death or disability). If the Board so determines,
            the purchase price for shares repurchased may be paid by
            cancellation of any indebtedness of the Purchaser to the Company.
            The repurchase option shall lapse at such rate as the Board may
            determine.

      d.    Other Provisions. The stock purchase agreement or stock bonus
            agreement shall contain such other terms, provisions and conditions
            not inconsistent with the Plan as may be determined by the Board of
            Directors.

10.   Non-Transferability of Options and Stock Purchase Rights. Unless
      determined otherwise by the Administrator, an Option or Stock Purchase
      Right may not be sold, pledged, assigned, hypothecated, transferred, or
      disposed of in any manner other than by will or by the laws of descent or
      distribution and may be exercised, during the lifetime of the Optionee,
      only by the Optionee. If the Administrator makes an Option or Stock
      Purchase Right transferable, such Option or Stock Purchase Right shall
      contain such additional terms and conditions as the Administrator deems
      appropriate.


<PAGE>   8
11.   Adjustments upon Changes in Capitalization or Merger.

      a.    Changes in Capitalization. Subject to any required action by the
            shareholders of the Company, the number of shares of Common Stock
            covered by each outstanding Option or Stock Purchase Right, and the
            number of shares of Common Stock which have been authorized for
            issuance under the Plan but as to which no Options or Stock Purchase
            Rights have yet been granted or which have been returned to the Plan
            upon cancellation or expiration of an Option or Stock Purchase
            Right, as well as the price per share of Common Stock covered by
            each such outstanding Option or Stock Purchase Right, shall be
            proportionately adjusted for any increase or decrease in the number
            of issued shares of Common Stock resulting from a stock split,
            reverse stock split, stock dividend, combination or reclassification
            of the Common Stock, or any other increase or decrease in the number
            of issued shares of Common Stock effected without receipt of
            consideration by the Company. The conversion of any convertible
            securities of the Company shall not be deemed to have been "effected
            without receipt of consideration." Such adjustment shall be made by
            the Board, whose determination in that respect shall be final,
            binding and conclusive. Except as expressly provided herein, no
            issuance by the Company of shares of stock of any class, or
            securities convertible into shares of stock of any class, shall
            affect, and no adjustment by reason thereof shall be made with
            respect to, the number or price of shares of Common Stock subject to
            an Option or Stock Purchase Right.

      b.    Dissolution or Liquidation. In the event of the proposed dissolution
            or liquidation of the Company, the Administrator shall notify the
            Optionee or Purchaser at least fifteen (15) days prior to such
            proposed action. To the extent it has not been previously exercised,
            the Option or Stock Purchase Right shall terminate immediately prior
            to the consummation of such proposed action.

      c.    Merger or Asset Sale. In the event of a merger, sale of all or
            substantially all of the assets of the Company, tender offer or
            other transaction or series of related transactions resulting in a
            change of ownership of more than 50% of the voting securities of the
            Company ("Change in Control"), approved by the majority of the
            members of the Board on the Board prior to the commencement of such
            Change in Control, each outstanding Option shall be assumed or an
            equivalent option or right substituted by the successor corporation
            or a Parent or Subsidiary of the successor corporation; provided
            however, in the event that within one year of the date of the
            completion of the Change in Control, the successor corporation or a
            Parent or Subsidiary of the successor corporation terminates the
            employment of an Optionee without Cause (as defined below), such
            Optionee shall fully vest in and have the right to exercise the
            options assumed or substituted for the Option as to all of the
            Optioned Stock, including Shares as to which it would not otherwise
            be exercisable. In the event that the successor corporation refuses
            to assume or substitute for the Option, the Optionee shall fully
            vest in and have the right to exercise the Option as to all of the
            Optioned Stock, including Shares as to which it would not otherwise
            be exercisable. If an Option becomes fully vested and exercisable in
            lieu of assumption or substitution in the event of a Change of
            Control, the Administrator shall notify the Optionee in writing or
            electronically that the Option shall be fully vested and exercisable
            for a period of fifteen (15) days from the date of such notice, and
            the Option shall terminate upon the expiration of such period. For
            the purposes of this paragraph, the Option shall be considered
            assumed if, following the Change of Control, the option confers the
            right to purchase, for each Share of Optioned Stock subject to the
            Option immediately prior to the Change in Control, the consideration
            (whether stock, cash, or other securities or property) received in
            the Change of Control by holders of Common Stock for each Share held
            on the effective date of the transaction (and if holders were
            offered a choice of consideration, the type of consideration chosen
            by the holders of a majority of the outstanding Shares); provided,
            however, that if such consideration received in the Change of
            Control is not solely common stock of the successor corporation or
            its Parent, the Administrator may, with the


<PAGE>   9
            consent of the successor corporation, provide for the consideration
            to be received upon the exercise of the Option, for each Share of
            Optioned Stock subject to the Option, to be solely common stock of
            the successor corporation or its Parent equal in fair market value
            to the per share consideration received by holders of Common Stock
            in the Change of Control. For purposes of this paragraph,
            termination shall be for "Cause" in the event of the occurrence of
            any of the following: (a) any intentional action or intentional
            failure to act by employee which was performed in bad faith and to
            the material detriment of the successor corporation or its Parent or
            Subsidiary; (b) employee willfully and habitually neglects the
            duties of employment; or (c) employee is convicted of a felony crime
            involving moral turpitude, provided that in the event that any of
            the foregoing events is capable of being cured, the successor
            corporation or its Parent or Subsidiary shall provide written notice
            to the employee describing the nature of such event and the employee
            shall thereafter have five (5) business days to cure such event.

      In the event of a Change in Control which is not approved by the majority
of the members of the Board on the Board prior to the commencement of a Change
in Control, each Optionee shall fully vest in and have the right to exercise all
outstanding Options as to all of the Optioned Stock, including Shares as to
which it would not otherwise be exercisable.

12.   Date of Granting Options. The date of grant of an Option or Stock Purchase
      Right shall, for all purposes, be the date on which the Board makes the
      determination granting such Option or stock Purchase Right. Notice of the
      determination shall be given to each Employee or Consultant to whom an
      Option or Stock Purchase Right is so granted within a reasonable time
      after the date of such grant.

13.   Amendment and Termination of the Plan.

      a.    Amendment and Termination. The Administrator may at any time amend,
            alter, suspend or discontinue the Plan, but no amendment,
            alteration, suspension or discontinuation shall be made which would
            impair the rights of any Optionee under any grant theretofore made,
            without his or her consent. In addition, to the extent necessary and
            desirable to comply with Section 422 of the Code (or any other
            Applicable Laws or regulation, the requirements of the NASD or an
            established stock exchange), the Company shall obtain shareholder
            approval of any Plan amendment in such a manner and to such a degree
            as required.

      b.    Effect of Amendment or Termination. Any such amendment or
            termination of the Plan shall not affect Options or Stock Purchase
            Rights already granted, and such Options and Stock Purchase Rights
            shall remain in full force and effect as if this Plan had not been
            amended or terminated, unless mutually agreed otherwise between the
            Optionee and the Administrator, which agreement must be in writing
            and signed by the Optionee and the Company.

14.   Conditions Upon Issuance of Shares. Shares shall not be issued pursuant to
      the exercise of an Option or Stock Purchase Rights unless the exercise of
      such Option or Stock Purchase Rights and the issuance and delivery of such
      Shares pursuant thereto shall comply with all relevant provisions of law,
      including, without limitation, the Securities Act of 1933, as amended, the
      Exchange Act, the rules and regulations promulgated thereunder, and the
      requirements of any stock exchange upon which the Shares may then be
      listed, and shall be further subject to the approval of counsel for the
      Company with respect to such compliance.

      As a condition to the exercise of an Option or Stock Purchase Right, the
Company may require the person exercising such Option or Stock Purchase Right to
represent and warrant at the time of any such exercise that the Shares are being
purchased only for investment and without any present intention to sell or
distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required by any of the aforementioned relevant provisions of
law.


<PAGE>   10
15.   Reservation of Shares. The Company, during the term of this Plan, will at
      all times reserve and keep available such number of Shares as shall be
      sufficient to satisfy the requirements of the Plan.

      The inability of the Company to obtain authority from any regulatory body
having jurisdiction, which authority is deemed by the Company's counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the Company of any liability in respect of the failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

16.   Option, Stock Purchase and Stock Bonus Agreements. Options shall be
      evidenced by written option agreements in such form as the Board shall
      approve. Upon the exercise of Stock Purchase Rights, the Purchaser shall
      sign a stock purchase agreement or stock bonus agreement in such form as
      the Board shall approve.

17.   Shareholder Approval. Continuance of the Plan shall be subject to approval
      by the shareholders of the Company within twelve (12) months before or
      after the date the Plan is adopted. Such shareholder approval shall be
      obtained in the degree and manner required under Applicable Laws and the
      rules of any stock exchange upon which the Common Stock is listed.

18.   Information to Optionees and Purchasers. The Company shall provide to each
      Optionee and Purchaser, during the period for which such Optionee or
      Purchaser has one or more Options to Stock Purchase Rights outstanding, a
      balance sheet and an income statement at least annually. The Company shall
      not be required to provide such information to key employees whose duties
      in connection with the Company assure there access to equivalent
      information.



<PAGE>   1
                                                                    Exhibit 10.9


                              EMPLOYMENT AGREEMENT


      THIS AGREEMENT, dated as of March 1, 1997, is made by and between
NEUROCRINE BIOSCIENCES. INC., a Delaware corporation (hereinafter the
"Company"), and STEPHEN MARCUS, MD (hereinafter "Executive") and supersedes in
its entirety the Letter Agreement dated January 13, 1997.

                                 R E C I T A L S

      WHEREAS, the Company and Executive wish to set forth in this Agreement the
terms and conditions under which Executive is to be employed by the Company on
and after the date hereof; and

      NOW, THEREFORE, the Company and Executive, in consideration of the mutual
promises set forth herein, agree as follows:

                                    ARTICLE I

                                TERM OF AGREEMENT

      1.1   Commencement Date. Executive's employment with the Company under
this Agreement shall commence as of March 1,1997 ("Commencement Date") and this
Agreement shall expire after a period of three (3) years from the Commencement
Date, unless terminated earlier pursuant to Article 6.

      1.2   Renewal. The term of this Agreement shall be automatically renewed
for successive, additional three (3) year terms unless either party delivers
written notice to the other at least ninety (90) days prior to the expiration
date of this Agreement of an intention to terminate this Agreement or to renew
it for a term of less than three (3) years but not less than (1) year. If the
term of this Agreement is renewed for a term of less than three (3) years, then
thereafter the term of this Agreement shall be automatically renewed for
successive, additional identical terms unless either party delivers a written
notice to the other at least ninety (90) days prior to a terminate date of this
Agreement of an intention to terminate this Agreement or to renew it for a
different term of not less than one (1) year.

                                    ARTICLE 2

                                EMPLOYMENT DUTIES

      2.1   Title/Responsibilities. Executive hereby accepts employment with the
Company pursuant to the terms and conditions hereof. Executive agrees to serve
the Company in the position of Senior Vice President - Clinical & Regulatory
Affairs & Chief Medical Officer. Executive shall have the powers and duties
commensurate with such position, including but not limited to hiring personnel
necessary to carry out the responsibilities for such position as set forth in
the annual business plan approved by the Board of Directors.

      2.2   Full Time Attention. Executive shall devote his best efforts and his
full business time and attention to the performance of the services customarily
incident to such office and to such other services as the President or Board may
reasonably request, provided that Executive may also serve on the Boards of
Directors of one or more other companies with the prior written consent of the
Board at a regularly scheduled meeting of the Board.

      2.3   Other Activities. Except upon the prior written consent of the Board
of Directors, Executive shall not during the period of employment engage,
directly or indirectly, in any other business activity (whether or not pursued
for pecuniary advantage) that is or may be competitive with, or that might place
him in a competing


<PAGE>   2
position to that of the Company or any other corporation or entity that directly
or indirectly controls, is controlled by, or is under common control with the
Company (an "Affiliated Company"), provided that Executive may own less than two
percent of the outstanding securities of any such publicly traded competing
corporation.

                                    ARTICLE 3

                                  COMPENSATION

      3.1   Base Salary. Executive shall receive a Base Salary at an annual rate
of two hundred twenty thousand dollars ($220,000), payable semi-monthly in equal
installments in accordance with the Company's normal payroll practices. The
Company's Board of Directors shall provide Executive with annual performance
reviews, and, thereafter, Executive shall be entitled to such increase in Base
Salary as the Board of Directors may from time to time establish in its sole
discretion.

      3.2   Incentive Bonus. In addition to any other bonus Executive shall be
awarded by the Company's Board of Directors, the Company shall pay Executive a
bonus payment of up to fifty thousand dollars ($50,000) annually based upon
achievement by the Company against six to eight impact goals approved by the
Board of Directors annually. For purposes of determining the 1997 bonus payment,
the Executive will be considered having been employed for the full year 1997.
Such goals shall be set forth in writing by the Board within ninety (90) days
after the start of the Company's fiscal year and a copy shall be delivered to
Executive within fifteen (15) days thereafter. The Board of Directors shall, in
their sole discretion, determine whether such impact goals have been obtained.

      3.3   Equity. The Executive has been granted an option under the Company's
1992 Stock Incentive Plan, as amended, to purchase one hundred fifty thousand
(150,000) shares of the Company's common stock having an exercise price of $7.86
per share pursuant to a Consulting Agreement dated January 17, 1997, which
Consulting Agreement is hereby terminated, provided that such option shall
continue to vest over a four-year period with 25% of such vesting occurring on
March 1, 1998 and 1/48 per month thereafter.

      3.4   Withholdings. All compensation and benefits payable to Executive
hereunder shall be subject to all federal, state, local and other withholdings
and similar taxes and payments required by applicable law.

                                    ARTICLE 4

                     EXPENSE ALLOWANCES AND FRINGE BENEFITS

      4.1   Vacation. Executive shall be entitled to the greater of three (3)
weeks of annual paid vacation or the amount of annual paid vacation to which
Executive may become entitled under the terms of Company's vacation policy for
employees during the term of this Agreement.

      4.2   Benefits. During the term of this Agreement, the Company shall also
provide Executive with the usual health insurance benefits it generally provides
to its other senior management employees. As Executive becomes eligible in
accordance with criteria to be adopted by the Company, the Company shall provide
Executive with the right to participate in and to receive benefit from life,
accident, disability, medical, pension, bonus, stock, profit sharing and savings
plans and similar benefits made available generally to employees of the Company
as such plans and benefits may be adopted by the Company, provided that
Executive shall during the term of this Agreement, be entitled to receive at a
minimum standard medical and dental benefits similar to those afforded to other
Executive Officers of the Company. The amount and extent of benefits to which
Executive is entitled shall be governed by the specific benefit plan as it may
be amended from time to time.


<PAGE>   3
      4.3   Relocation.

            a.    The Company will arrange to purchase the Executive's Home in
      Maryland ("Maryland Home") through the PH&H Home Equity ("Home Equity")
      program. Home Equity will arrange the purchase of your Maryland Home at
      the current fair market value.

            b.    In the event the fair market value of the Maryland Home as
      determined by Home Equity, before deducting direct selling expenses or
      commissions (the "Sales Price"), is less than the Executive's purchase
      price of such home (the "Purchase Price"), the Company will reimburse the
      Executive up to $25,000 for such loss.

            c.    The Company will reimburse the Executive for reasonable and
      customary out of pocket expenses relating to:

                  (i)   reasonable and customary house hunting and temporary
            living expenses of up to four months; 

                  (ii)  reasonable and customary closing costs and fees,
            including up to one and one half points (1.5%) of the mortgage
            financing amount related to the purchase of a new home in the San
            Diego area;

                  (iii) reasonable and customary moving expenses of household
            goods and personal property (including temporary storage) to San
            Diego, CA;

                  (iv)  up to $15,000 in other miscellaneous documented
            expenses.

      The Company will reimburse the Executive for federal and state income
      taxes associated with items (i) through (iii), except for those expenses
      which are: (a) deductible for federal and state income tax purposes,
      including but not limited to mortgage financing points, travel from
      Maryland to San Diego and movement of household goods and (b) temporary
      housing costs following the elimination of the Executive's carrying costs
      (including but not limited to mortgage payments, tax payments, utilities,
      etc.) of the Maryland Home.

      4.4   Mortgage Equalization. In connection with the purchase of a home in
the San Diego area for a price at least equal to the cost of the Maryland Home,
the Company will provide an annual mortgage equalization payment over a three
year period. Such payments will be based on the interest associated with an
amount equal to the difference between your purchase price of your new home in
San Diego and the selling price of your existing home. Such annual equalization
payments will be as follows from the date of purchase and payable semi-monthly
(i) Year One - $16,000; (ii) Year Two - $10,560; (iii) Year Three - $5,280

                                    ARTICLE 5

                                 CONFIDENTIALITY

      5.1   Proprietary Information. Executive represents and warrants that he
has previously executed and delivered to the Company the Company's standard
Proprietary Information and Inventions Agreement in form acceptable to the
Company's counsel.

      5.2   Return of Property. All documents, records, apparatus, equipment and
other physical property which is furnished to or obtained by Executive in the
course of his employment with the Company shall be and remain the sole property
of the Company. Executive agrees that, upon the termination of his employment,
he shall return all such property (whether or not it pertains to Proprietary
Information as defined in the Proprietary Information and Inventions Agreement),
and agrees not to make or retain copies, reproductions or summaries of any such
property.


<PAGE>   4
                                    ARTICLE 6

                                   TERMINATION

      6.1   By Death. The period of employment shall terminate automatically
upon the death of Executive. In such event, the Company shall pay to Executive's
beneficiaries or his estate, as the case may be, any accrued Base Salary, any
bonus compensation to the extent earned, any vested deferred compensation (other
than pension plan or profit-sharing plan benefits which will be paid in
accordance with the applicable plan), any benefits under any plans of the
Company in which Executive is a participant to the full extent of Executive's
rights under such plans, any accrued vacation pay and any appropriate business
expenses incurred by Executive in connection with his duties hereunder, all to
the date of termination (collectively Accrued Compensation), but no other
compensation or reimbursement of any kind, including, without limitation,
severance compensation, and thereafter, the Company's obligations hereunder
shall terminate.

      6.2   By Disability. If Executive is prevented from properly performing
his duties hereunder by reason of any physical or mental incapacity for a period
of 120 consecutive days, or for 180 days in the aggregate in any 365-day period,
then, to the extent permitted by law, the Company may terminate the employment
of Executive at such time. In such event, the Company shall pay to Executive all
Accrued Compensation, and shall continue to pay to Executive the Base Salary
until such time (but not more than 90 days following termination), as Executive
shall become entitled to receive disability insurance payments under the
disability insurance policy maintained by the Company, but no other compensation
or reimbursement of any kind, including without limitation, severance
compensation, and thereafter the Company's obligations hereunder shall
terminate. Nothing in this Section shall affect Executive's rights under any
disability plan in which he is a participant.

      6.3   By Company for Cause. The Company may terminate the Executive's
employment for Cause (as defined below) without liability at any time with or
without advance notice to Executive. The Company shall pay Executive all Accrued
Compensation, but no other compensation or reimbursement of any kind, including
without limitation, severance compensation, and thereafter the Company's
obligations hereunder shall terminate. Termination shall be for "Cause" in the
event of the occurrence of any of the following: (a) any intentional action or
intentional failure to act by Executive which was performed in bad faith and to
the material detriment of the Company; (b) Executive intentionally refuses or
intentionally fails to act in accordance with any lawful and proper direction or
order of the Board; (c) Executive willfully and habitually neglects the duties
of employment; or (d) Executive is convicted of a felony crime involving moral
turpitude, provided that in the event that an of the foregoing events is capable
of being cured, the Company shall provide written notice to Executive describing
the nature of such event and Executive shall thereafter have ten (10) business
days to cure such event.

      6.4   Termination Without Cause. At any time, the Company may terminate
the employment of Executive without liability other than as set forth below, for
any reason not specified in Section 6.3 above, by giving thirty (30) days
advance written notice to Executive. If the Company elects to terminate
Executive pursuant to this Section 6.4, (a) the Company shall pay to Executive
all Accrued Compensation (b) the Company shall continue to pay to Executive as
provided herein Executive's Base Salary over the period equal to nine (9) months
from the date of such termination as severance compensation, (c) if Executive's
employment terminates in the second half of the Company's fiscal year, the
Company shall make a lump sum payment to Executive in an amount equal to a pro
rata portion of the Executive's annual actual cash incentive bonus for Company's
fiscal year preceding the year of termination based on the number of completed
months of Executive's employment in the fiscal year divided by nine (9); (d) the
vesting of all outstanding stock options held by Executive shall be accelerated
so that the amount of shares vested under such option shall equal that number of
shares which would have been vested if the Executive had continued to render
services to the Company for nine (9) continuous months after the date of his
termination of employment, -and (e) the Company shall pay all costs which the
Company would otherwise have incurred to maintain all of Executive<, health-and
welfare, and retirement benefits (either on the same -or substantially
equivalent terms and conditions) if the Executive had continued to render
services to the Company for nine (9) continuous months after the date of his
termination of employment. The Company shall have no


<PAGE>   5
further obligations to Executive other than those set forth in the preceding
sentence. During the period when such Base Salary severance compensation is
being paid to Executive, Executive shall not(i) engage, directly or indirectly,
in providing services to any other business program or project that is
competitive to a program or project being conducted by the Company or any
Affiliated Company at the time of such employment termination (provided that
Executive may own less than two percent (2%) of the outstanding securities of
any publicly traded corporation), or (ii) hire, solicit, or attempt to solicit
on behalf of himself or any other party or any employee or exclusive consultant
of the Company. If the Company terminates this Agreement or the employment of
Executive with the Company other than pursuant to Section 6.1, 6.2 or 6.3, then
this section 6.4 shall apply.

      6.5   Constructive Termination A Constructive Termination shall be deemed
to be a termination of employment of Executive without cause pursuant to Section
6.4 For Purposes of this Agreement, a "Constructive Termination" means that the
Executive voluntarily terminates his employment after any of the following are
undertaken without Executive's express written consent:

            (a)   the assignment to Executive of any duties or responsibilities
      which result in any diminution or adverse change of Executive's position,
      status or circumstances of employment; or any removal of Executive from or
      any failure to re-elect Executive to any of such positions, including, but
      not limited to, Executive's membership on the Board, except in connection
      with the termination of his employment for death, disability, retirement,
      fraud, misappropriation, embezzlement (or any other occurrence which
      constitutes "Cause" under section 6.3) or any other voluntary termination
      of employment by Executive other than a Constructive Termination;

            (b)   a reduction by the Company in Executive's annual Base Salary
      by greater than five percent(5%);

            (c)   a relocation of Executive or the Company's principal executive
      offices if Executive's principal office is at such offices, to a location
      more than forty (40) miles from the location at which Executive is then
      performing his duties, except for an opportunity to relocate which is
      accepted by Executive in writing;

            (d)   any material breach by the Company of any provision of this
      Agreement; or

            (e)   any failure by the Company to obtain the assumption of this
      Agreement by any successor or assign of the Company.

      6.6   Termination Following Change in Control. In the event of a
non-renewal of this Agreement, a termination without Cause or a Constructive
Termination within eighteen (18) months following a Change in Control, Executive
shall receive the same benefits package as Executive would have-received upon-a-
termination-without-Cause (except that the payment of Base Salary shall be made
in the form of a lump sum) and in addition, the vesting of all outstanding stock
options held by Executive shall be accelerated so that the options are
immediately exercisable in full.

      6.7   Change in Control. For purposes of this Agreement, a "Change in
Control" shall have occurred if at any time during the term of Executive's
employment hereunder, any of the following events shall occur:

            (a)   The Company is merged, or consolidated. or reorganized into or
      with another corporation or other legal person, and as a result of such
      merger, consolidation or reorganization less than 50% of the combined
      voting power of the then-outstanding securities of such corporation or
      person immediately after such transaction are held in the aggregate by the
      holders of voting securities of the Company immediately prior to such
      transaction;


<PAGE>   6
            (b)   The Company sells all or substantially all of its assets or
      any other corporation or other legal person and thereafter, less than 50%
      of the combined voting power of the then-outstanding voting securities of
      the acquiring or consolidated entity are held in the aggregate by the
      holders of voting securities of the Company immediately prior to such
      sale;

            (c)   There is a report filed after the date of this Agreement on
      Schedule 13 D or schedule 14 D-l (or any successor schedule, form or
      report), each as promulgated pursuant to the Securities Exchange Act of
      1934 (the "Exchange Act") disclosing that any person (as the term "person"
      is used in Section 13(d)(3) or Section 14(d)(2) of the exchange Act) has
      become the beneficial owner (as the term beneficial owner is defined under
      Rule 13d-3 or any successor rule or regulation promulgated under the
      Exchange Act) representing 50% or more of the combined voting power of the
      then-outstanding voting securities of the Company;

            (d)   The Company shall file a report or proxy statement with the
      Securities and Exchange Commission pursuant to the Exchange Act disclosing
      in response to item 1 of Form 8X thereunder or Item 5(f) of Schedule 14 A
      thereunder (or any successor schedule, form or report or item therein)
      that the change in control of the Company has or may have occurred or will
      or may occur in the future pursuant to any then-existing contract or
      transaction; or

            (e)   During any period of two consecutive years, individuals who at
      the beginning of any such period constitute the directors of the Company
      cease for any reason to constitute at least a majority thereof unless the
      election to the nomination for election by the Company's shareholders of
      each director of the Company first elected during such period was approved
      by a vote of at least two-thirds of the directors of the Company then
      still in office who were directors of the Company at the beginning of such
      period.

      6.8   Termination by Executive. At any time, Executive may terminate his
employment by giving thirty (30) days advance written notice to the Company. The
Company shall pay Executive all Accrued Compensation, but no other compensation
or reimbursement of any kind, including without limitation, severance
compensation, and thereafter the Company's obligations hereunder shall
terminate.

      6.9   Mitigation. Except as otherwise specifically provided herein,
Executive shall not be required to mitigate the amount of any payment provided
under this Agreement by seeking other employment or self- employment, nor shall
the amount of any payment provided for under this Agreement be reduced by any
compensation earned by Executive as a result of employment by another employer
or through self-employment or by retirement benefits after the date of
Executive's termination of employment from the Company.

      6.10  Coordination. If upon termination of employment, Executive becomes
entitled to rights under other plans, contracts or arrangements entered into by
the Company, this Agreement shall be coordinated with such other arrangements so
that Executive's rights under this Agreement are not reduced, and that any
payments under this Agreement offset the same types of payments otherwise
provided under such other arrangements, but do not otherwise reduce any payments
or benefits under such other arrangements to which Executive becomes entitled.

                                    ARTICLE 7

                               GENERAL PROVISIONS

      7.1   Governing law. The validity, interpretation, construction and
performance of this Agreement and the rights of the parties thereunder shall be
interpreted and enforced under California law without reference to principles of
conflicts of laws. The parties expressly agree that inasmuch as the Company's
headquarters and principal place of business are located in California, it is
appropriate that California law govern this Agreement.


<PAGE>   7
      7.2   Assignment. Successors Binding Agreement.

            7.2.1 Executive may not assign, pledge or encumber his interest in
      this Agreement or any part thereof.

            7.2.2 The Company will require any successor (whether direct or
      indirect, by purchase, merger, consolidation or otherwise) to all or
      substantially all of the business and/or assets of the Company, by
      operation of law or by agreement in form and substance reasonably
      satisfactory to Executive, to assume and agree to perform this agreement
      in the same manner and to the same extent that the Company would be
      required to perform it if no such succession had taken place.

            7.2.3 This Agreement shall inure to the benefit of and be
      enforceable by Executive's personal or legal representatives, executors,
      administrators, successors, heirs, distributee, devisees and legatees. If
      Executive should die while any amount is at such time payable to him
      hereunder, all such amounts, unless otherwise provided herein, shall be
      paid in accordance with the terms of this Agreement to Executive's
      devisee, legates or other designee or, if there be no such designee, to
      his estate.

      7.3   Certain Reduction of Payments In the event that any payment or
benefit received or to be received by Executive under this Agreement would
result in all or a portion of such payment to be subject to the excise tax on
"golden parachute payments" under Section 4999 of the Internal Revenue Code of
1986, as amended (the "Code"), then Executive's payment shall be either (a) the
full payment or (b) such lesser amount which would result in no portion of the
payment being subject to excise tax under Section 4999 of the Code, whichever of
the foregoing amounts, taking into account the applicable Federal, state and
local employment taxes, income taxes, and the excise tax imposed by Section 4999
of the Code, results in the receipt by Executive on an after-tax basis, of the
greatest amount of the payment notwithstanding that all or some portion of the
payment may be taxable under Section 4999 of the Code.

      7.4   Notice. For the purposes of this Agreement, notices and all other
communications provided for in this Agreement shall be in writing and shall be
deemed to have been duly given when delivered or mailed by certified or
registered mail, return receipt requested, postage prepaid, addressed to the
respective addresses set forth below or to such other address as either party
may have furnished to the other in writing in accordance herewith, except that
notice of change of address shall be effective only upon receipt.

To the Company:

Neurocrine Biosciences, Inc.
3050 Science Park Road
San Diego, CA 92121
Attn.: President & Chief Executive Officer

To Executive:

Dr. Stephen Marcus
13472 Wyngate Point
San Diego, CA 92130

      7.5   Modification: Waiver: Entire Agreement. No provisions of this
Agreement may be modified, waived or discharged unless such waiver, modification
or discharge is agreed to in writing signed by Executive and such officer as may
be specifically designated by the Board of the Company. No waiver by either
party hereto at any time of any breach by the other party of, or compliance
with, any condition or provision of this Agreement to be performed by such other
party shall be deemed a waiver of similar or dissimilar provisions or conditions
at the same or any prior subsequent time. No agreements or representations, oral
or otherwise, express or implied,


<PAGE>   8
with respect to the subject matter hereof have been made by either party which
are not expressly set forth in this Agreement.

      7.6   Validity. The invalidity or unenforceability of any provision of
this Agreement shall not affect the validity or enforceability of any other
provision of this Agreement, which shall remain in full force and effect.

      7.7   Controlling Document. Except to the extent described in Section
6.10, in case of conflict between any of the terms and condition of this
Agreement and the document herein referred to, the terms and conditions of this
Agreement shall control.

      7.8   Executive Acknowledgment. Executive acknowledges (a) that he has
consulted with or has had the opportunity to consult with independent counsel of
his own choice concerning this Agreement, and has been advised to do so by the
Company, and (b) that he has read and understands the Agreement, is fully aware
of its legal effect, and has entered into it freely based on his own judgment.

      7.9   Remedies

            7.9.1 Injunctive Relief. The parties agree that the services to be
      rendered by Executive hereunder are of a unique nature and that in the
      event of any breach or threatened breach of any of the covenants contained
      herein, the damage or imminent damage to the value and the goodwill of the
      Company's business will be irreparable and extremely difficult to
      estimate, making any remedy at law or in damages inadequate. Accordingly,
      the parties agree that the Company shall be entitled to injunctive relief
      against Executive in the event of any breach or threatened breach of any
      such provisions by Executive, in addition to any other relief (including
      damage) available to the Company under this Agreement or under law.

            7.9.2 Exclusive. Both parties agree that the remedy specified in
      Section 7.9.1 above is not exclusive of any other remedy for the breach by
      Executive of the terms hereof.

      7.10  Counterparts. This Agreement may be executed in one or more
counterparts which taken together shall constitute one and the same Agreement.

      7.11  Prevailing Party Expenses. In the event that any action or
proceeding is commenced to enforce the provisions of the Agreement, the court
adjudicating such action or proceeding shall award to the prevailing party all
costs and expenses thereof, including, but not limited to, all reasonable
attorneys' fees, court costs, and all other related expenses.

Executed by the parties as of the day and year first above written.

EXECUTIVE

By:_______________________________
        Stephen Marcus, MD

NEUROCRINE BIOSCIENCES, INC


By:_______________________________
Gary A. Lyons
President & Chief Executive Officer



<PAGE>   1
                                                                      Exhibit 21


                  SUBSIDIARIES OF NEUROCRINE BIOSCIENCES, INC.


                                                                 Place of
        Name of Subsidiary                                       Incorporation
        ------------------                                       -------------

        Neurocrine Biosciences (Canada), Inc.                    Canada



<PAGE>   1
                                                                      Exhibit 23


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement
(Form S-8 No. 333-14589) pertaining to the 1992 Incentive Stock Option Plan,
1996 Employee Stock Purchase Plan and the 1996 Director Option Plan of
Neurocrine Biosciences, Inc. of our report dated February 3, 1998, except for   
Note 10, for which the date is February 27, 1998, with respect to the financial
statements of Neurocrine Biosciences, Inc. included in this Annual Report (Form
10-K) for the year ended December 31, 1997.


                                            /s/  ERNST & YOUNG LLP
                                            ------------------------------------
                                            ERNST & YOUNG LLP


San Diego, California
April 7, 1998


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