COCENSYS INC
S-3, 1999-04-05
PHARMACEUTICAL PREPARATIONS
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 5, 1999
                                                      REGISTRATION NO. 333-
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  ---------------

                                      FORM S-3
                               REGISTRATION STATEMENT
                                       UNDER
                             THE SECURITIES ACT OF 1933

                                  ---------------

                                   COCENSYS, INC.
               (Exact name of Registrant as specified in its charter)


                DELAWARE                                33-0538836
     (State or other jurisdiction of         (I.R.S. Employer Identification
     incorporation or organization)                       Number)

                                  ---------------

                                201 TECHNOLOGY DRIVE
                                  IRVINE, CA 92618
                                   (949) 753-6100
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                                  ---------------

                             F. RICHARD NICHOL, PH.D.
                       PRESIDENT AND CHIEF EXECUTIVE OFFICER
                                201 TECHNOLOGY DRIVE
                                  IRVINE, CA 92618
                                   (949) 753-6100
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)

                                  ---------------

                                    COPIES TO:
           ANDREA VACHSS, ESQ.                     ROBERT HOLMEN, ESQ.
            COOLEY GODWARD LLP                       COCENSYS, INC.
          FIVE PALO ALTO SQUARE                   201 TECHNOLOGY DRIVE
           3000 EL CAMINO REAL                      IRVINE, CA 92618
     PALO ALTO, CALIFORNIA 94306-2155                (949) 753-6100
             (650) 843-5000

                                  ---------------

          Approximate date of commencement of proposed sale to the public:
    AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.

                                  ---------------

     If the only securities being registered on this Form are being offered 
pursuant to dividend or interest reinvestment plans, please check the 
following box.  / /

     If any of the Securities being registered on this Form are to be offered 
on a delayed or continuous basis pursuant to Rule 415 under the Securities 
Act of 1933, other than securities offered in connection with dividend or 
interest reinvestment plans, check the following box.  /X/

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /

     If this Form is a post-effective amendment filed pursuant to Rule 462(c) 
under the Securities Act, check the following box and list the Securities Act 
registration statement number of the earlier effective registration statement 
for the same offering.  / /

     If delivery of the Prospectus is expected to be made pursuant to Rule 
434, please check the following box. / /

                          CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>


                                                                     PROPOSED MAXIMUM        PROPOSED MAXIMUM       AMOUNT OF
           TITLE OF CLASS OF                   AMOUNT TO BE         OFFERING PRICE PER      AGGREGATE OFFERING     REGISTRATION
      SECURITIES TO BE REGISTERED               REGISTERED              SHARE (3)               PRICE (3)              FEE
 ----------------------------------------  ---------------------    ------------------      ------------------     ------------
 <S>                                       <C>                      <C>                     <C>                    <C>
 Common Stock, $0.001 par value per share  25,000,000 shares (1)            $0.23                 $5,859,375            $1,629
 Common Stock, $0.001 par value per share     100,000 shares (2)            $0.63                  $62,500               $18

</TABLE>

(1)  Includes (i) up to 25,000,000 shares of common stock to be issued upon
     conversion of the Company's Series E Convertible Preferred Stock (the
     "Preferred Stock") and (ii) an indeterminate number of additional shares of
     common stock as may from time to time become issuable upon conversion of
     the Preferred Stock by reason of stock splits, stock dividends and similar
     transactions, which shares are registered hereunder pursuant to Rule 416
     under the Securities Act.  The number of shares of common stock included in
     the Registration Statement represents the Company's good faith estimate of
     the number of shares of common stock issuable upon conversion of the
     Preferred Stock calculated on the basis of a conversion price of $0.21 per
     share, which is less than the proposed maximum offering price. 

(2)  Includes (i) up to 100,000 shares of common stock to be issued upon
     exercise of warrants to purchase common stock (the "Warrants") and (ii) an
     indeterminate number of additional shares of common stock as may from time
     to time become issuable upon exercise of the Warrants by reason of stock
     splits, stock dividends and antidilution provisions, which shares are
     registered hereunder pursuant to Rule 416 under the Securities Act.

(3)  Estimated solely for the purpose of calculating the registration fee in
     accordance with Rule 457 under the Securities Act.   The prices per share
     and aggregate offering prices are based on (i) with respect to the common
     stock issuable upon the conversion of Preferred Stock, the average of the
     high and low prices of the Registrant's common stock on April 1, 1999 as
     reported on the Nasdaq National Market and (ii) with respect to 100,000
     shares of common stock issuable upon exercise of Warrants, the exercise
     price of the Warrants.

     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT THAT SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------


<PAGE>
                     SUBJECT TO COMPLETION, DATED APRIL 5, 1999

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.  WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE.  THIS PROSPECTUS IS NOT AN
OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED. 

PROSPECTUS

                                 25,100,000 SHARES
                                          
                                   COCENSYS, INC.
                                    COMMON STOCK
                                          
     The selling stockholders listed on page 13 are offering up to 25,100,000
shares of CoCensys, Inc. common stock that they may acquire by converting Series
E Convertible Preferred Stock or by exercising warrants.  The selling
stockholders also may offer additional shares of common stock acquired upon
conversion of Series E Convertible Preferred Stock or exercise of warrants as a
result of stock splits or similar events.

     We sold 8,000 shares of our  Series E Convertible Preferred Stock and
warrants to purchase 350,000 shares of common stock to the selling stockholders
on June 8, 1998 in a private transaction.  As a result of the selling
stockholders' satisfying certain conditions in the agreement for their purchase
of the Series E Convertible Preferred Stock, we issued the selling stockholders
warrants to purchase an additional 100,000 shares of common stock on November 8,
1998.  We will not receive any proceeds from the sale of common stock by the
selling stockholders.  However, we will receive the exercise price of any
warrants exercised for cash.

     Our common stock trades on the Nasdaq National Market under the symbol
COCN.  On April 1, 1999, the last reported sale price of our common stock was
$0.25 per share.

     We will not be paying any underwriting discounts or commissions in this
offering.

           INVESTING IN OUR COMMON STOCK INVOLVES A HIGH DEGREE OF RISK.
                      SEE "RISK FACTORS" BEGINNING ON PAGE 5.

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

APRIL 5, 1999

<PAGE>

                                   ABOUT COCENSYS

     CoCensys is developing small molecule drugs to treat neurological and 
psychiatric disorders. Our product discovery and development programs are 
focused on exploring novel receptors and their ligands and inhibitors through 
three technology platforms: specific GABA(A) receptor modulators named 
Epalons; glutamate receptor antagonists; and sodium channel blockers.

     We are a Delaware corporation.  Our executive offices are located at 201 
Technology Drive, Irvine, California 92618, and our telephone number is (949) 
753-6100.  In this prospectus, "CoCensys," "we" and "our" refer to CoCensys, 
Inc., unless the context otherwise requires.

     You should rely only on the information provided or incorporated by 
reference in this prospectus.  We have authorized no one to provide you with 
different information.  We are not making an offer of these securities in any 
state where the offer is not permitted.  You should not assume that the 
information in this prospectus or any prospectus supplement is accurate as of 
any date other than the date on the front of the document.

                        WHERE YOU CAN FIND MORE INFORMATION

     We have filed with the SEC a registration statement on Form S-3 to 
register the common stock offered by this prospectus.  However, this 
prospectus does not contain all of the information contained in the 
registration statement and the exhibits and schedules to the registration 
statement.  We strongly encourage you to carefully read the registration 
statement and the exhibits and schedules to the registration statement. 

     We file annual, quarterly and special reports, proxy statements and 
other information with the SEC.  You may read and copy any document we file 
at the SEC's public reference rooms in Washington, DC, New York, New York and 
Chicago, Illinois.  You can request copies of these documents by contacting 
the SEC and paying a fee for the copying cost.  Please call the SEC at 
1-800-SEC-0330 for further information on the public reference rooms.  Our 
SEC filings are also available to the public from the SEC's website at 
www.sec.gov.

     The SEC allows us to "incorporate by reference" the information 
contained in documents that we file with them, which means that we can 
disclose important information to you by referring you to those documents.  
The information incorporated by reference is considered to be part of this 
prospectus. Information in this prospectus supersedes information 
incorporated by reference which we filed with the SEC prior to the date of 
this prospectus, while information that we file later with the SEC will 
automatically update and supersede this information.  We incorporate by 
reference the documents listed below and any future filings we will make with 
the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange 
Act of 1934: 

     1.   Our Annual Report on Form 10-K for the fiscal year ended December 31,
          1998;

     2.   The description of the common stock contained in our registration
          statement on Form 8-A filed on December 10, 1992; and 

     3.   The description of the Preferred Share Purchase Rights contained in
          our registration statement on Form 8-A as filed on May 16, 1995.

You may request a copy of these filings, at no cost to you, by writing or 
telephoning us at:

                                   CoCensys, Inc.
                           Attention: Investor Relations
                                201 Technology Drive
                             Irvine, California  92618
                             Telephone:  (949) 753-6100

                                      3.

<PAGE>

                 SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

     Some of the statements in this prospectus and the documents incorporated 
by reference are forward-looking statements.  These statements involve known 
and unknown risks, uncertainties, and other factors that may cause our or our 
industry's results, levels of activity, performance, or achievements to be 
materially different from any future results, levels of activity, 
performance, or achievements expressed or implied by such forward-looking 
statements.  These factors include, among others, those listed under "Risk 
Factors" and in the documents incorporated by reference.

     In some cases, you can identify forward-looking statements by 
terminology such as "may," "will," "should," "expects," "plans," 
"anticipates," "believes," "estimates," "predicts," "potential," or 
"continue" or the negative of such terms or other comparable terminology.

     Although we believe that the expectations reflected in the 
forward-looking statements are reasonable, we cannot guarantee future 
results, events, levels of activity, performance, or achievements.  We do not 
assume responsibility for the accuracy and completeness of the 
forward-looking statements.  We do not intend to update any of the 
forward-looking statements after the date of this prospectus to conform them 
to actual results.

                                      4.

<PAGE>

                                    RISK FACTORS

     BUYING SHARES OF OUR COMMON STOCK IS RISKY.  YOU SHOULD CAREFULLY READ AND
CONSIDER THE FOLLOWING RISK FACTORS BEFORE YOU DECIDE WHETHER TO PURCHASE SHARES
OF COCENSYS COMMON STOCK.  ANY OF THESE RISK FACTORS COULD MATERIALLY ADVERSELY
AFFECT OUR BUSINESS, OPERATING RESULTS AND FINANCIAL CONDITION AND COULD RESULT
IN A COMPLETE LOSS OF YOUR INVESTMENT.

OUR PRODUCTS ARE IN AN EARLY STAGE OF DEVELOPMENT AND THERE IS A HIGH RISK 
OF FAILURE.

     We have no products that have received regulatory approval for 
commercial sale.  All of our drug candidates are in the early stages of 
development, and our technology is unproven. The physiology of brain 
disorders is highly complex, and the causes of these disorders are not fully 
known.  We will have to conduct significant research and pre-clinical 
(animal) and clinical (human) tests that demonstrate that our products are 
safe and effective before we can file applications for approval with the 
United States Food and Drug Administration and foreign regulatory 
authorities. Any of our products may fail in the testing phase or may fail to 
attain market acceptance.  Competitors may develop superior products.  Third 
parties may have proprietary rights that preclude us from marketing our 
products.  If research and testing is not successful, our products are not 
commercially viable or we cannot compete effectively, our business, financial 
condition and results of operations will be materially adversely affected.

THE OUTCOME OF CLINICAL DEVELOPMENT IS HIGHLY UNCERTAIN.
 
     Clinical trials, including pre-clinical testing, are lengthy, expensive 
and uncertain.  Failure can occur at any stage. We have no products that have 
successfully completed all necessary clinical testing. Three of our drug 
candidates have undergone some clinical testing, and three currently are in 
pre-clinical testing. We do not know whether the FDA will allow us to begin 
human testing of our drug candidates that have not been tested in humans or 
to continue human testing of those candidates that have undergone some human 
testing.  We cannot rely on interim results of trials to predict their final 
results, nor can we count on acceptable results at early stages of testing to 
be repeated at later stages.  Any of our drug candidates could have 
undesirable or unintended side effects or other problems that may prevent or 
limit future testing, approval or use of the product.

     We have experienced safety and efficacy problems with drug candidates.  
In a clinical trial of licostinel, our drug candidate to treat stroke, 
crystals of licostinel occurred in the urine of some subjects, a potential 
dose-limiting side effect.  Although the crystal formation occurred only in 
subjects with at least four times the blood plasma level of licostinel that 
was necessary for the drug to be effective in animals, our development 
partner, Novartis Pharma A.G., ceased its participation in the development of 
licostinel.  In addition, in October 1998 we announced that ganaxolone, our 
drug candidate to treat migraine and epilepsy, was not effective in providing 
relief to patients suffering migraine headaches.  The results of a clinical 
trial in which 325 migraine patients received either ganaxolone or a placebo 
drug did not show a statistically significant difference in migraine headache 
relief between those patients receiving ganaxolone and those patients 
receiving the placebo. 

     We cannot assure you that any of our clinical trials will be completed 
successfully or at all, or that they will result in marketable products. Any 
significant delay or failure in the clinical development of our products will 
materially adversely affect our business, financial condition and results of 
operations.

WE HAVE NEVER BEEN PROFITABLE, AND WE EXPECT TO CONTINUE TO GENERATE 
SIGNIFICANT LOSSES.

     Since we started business in 1989, we have spent over $174 million 
researching and developing our drug candidates.  We have raised this money by 
selling stock in CoCensys to private investors and the public, licensing 
drugs and technologies to other companies and selling assets that we have 
developed at CoCensys.  We have never been profitable and, through December 
31, 1998, we have incurred a cumulative deficit of approximately $116 million.

                                      5.

<PAGE>

     We expect to continue to incur substantial and increasing losses over 
the next several years as we continue our research and development programs. 
To achieve and sustain profitable operations in the long term, we must 
successfully develop, obtain regulatory approval for, manufacture, introduce, 
market and sell drugs from our technologies.  Failure to do so will 
materially adversely affect our business, financial conditions and results of 
operations.

WE WILL NEED SIGNIFICANT ADDITIONAL FUNDS.   

     Drug development is capital intensive and requires significant funding 
commitments.  We will need a substantial amount of funds to continue our 
operations both in the near term and over the next several years. If we do 
not raise additional funds by the end of 1999, we will be forced to curtail 
our operations. Our cash needs beyond 1999 will vary depending on a number of 
factors, including the following:

     -    the size and progress of our research and development programs;

     -    the results of our animal and human testing of our drugs;

     -    the time and costs of obtaining regulatory approvals for our drugs (if
          approvals can be achieved);

     -    how good our drugs are compared to other drugs on the market that
          treat the same disorders;

     -    the time, costs and success of establishing sales and marketing
          capabilities; and

     -    the time, costs and success of establishing manufacturing
          capabilities.

     We do not know if we will be able to raise funds on terms that are 
acceptable to us.  If we sell additional stock, you may experience 
substantial dilution.  If we raise cash through licensing additional drugs 
and technologies to collaboration partners, we will be required to relinquish 
rights to some of our drugs and technologies.

     If we cannot raise enough cash to fund our operations, we may be forced 
to delay, reduce the scope of or eliminate one or more of our research or 
development programs.  We may have to cease all operations if we are not 
successful in obtaining funds.

WE DEPEND ON THIRD PARTIES TO FUND OUR DRUG DEVELOPMENT.

     In order to fund the development, clinical testing, manufacturing and 
commercialization of our products, we have entered into various 
collaborations with corporate partners, licensors, licensees and others.  
Currently, we are a party to a collaboration agreement with Warner-Lambert 
Company for research and development of subtype-selective NMDA receptor 
antagonists and with Wyeth-Ayerst Laboratories, a division of American Home 
Products Corporation, for the development of epalons to treat anxiety.  Under 
each agreement, we depend on the collaboration partner to provide the funding 
to develop drug candidates for potential approval and commercialization.

     WE MAY BE UNABLE TO FULFILL OUR OBLIGATIONS UNDER THE COLLABORATION 
AGREEMENTS.  We do not know if we will have the substantial resources needed 
to fulfill our research and development obligations under each collaboration 
agreement.  If we cannot fulfill our obligations, we may be required to 
terminate early one or both of the agreements and forfeit many of our rights 
under the agreements. In particular, our collaboration agreement with 
Wyeth-Ayerst provides that if the lead compound under development to treat 
anxiety fails to meet certain criteria, and if at that time we have not yet 
produced a back-up compound that meets another set of criteria, Wyeth-Ayerst 
can demand repayment of a portion of the funds paid to us under our 
collaboration agreement.  Currently, the amount that we may be required to 
pay back could be as much as $3 million, in cash or common stock.  Although 
we hope to fulfill our obligations under the collaboration agreement so that 
Wyeth-Ayerst will not be able to demand repayment, we cannot assure we will 
be able to do so. 

                                      6.

<PAGE>

     EITHER OF OUR COLLABORATION PARTNERS MAY CANCEL ITS COLLABORATION 
AGREEMENT WITH US AT ANY TIME.  Each of our collaboration agreements allows 
either CoCensys or our collaboration partner to voluntarily terminate its 
participation in the collaboration at any time.  If either of our current 
collaboration partners terminates its agreement with us, that partner would 
lose its right to further develop or sell drugs under that collaboration; 
however, that partner also no longer would be required to fund development of 
those drugs.  If either Warner-Lambert or Wyeth-Ayerst  cancels its agreement 
with us, we would have to find a new collaboration partner to pay for further 
development of our drug candidates. We cannot  assure you that we would be 
able to do so.  Collaboration partners have, in the past, terminated their 
agreements with us.  In 1994, we entered into a development agreement with 
Novartis Pharma A.G. to develop licostinel to treat stroke patients.  In 
1997, Novartis terminated its participation in the development agreement 
based on side effects seen in human trials of licostinel.  Also, in 1996, we 
entered into an agreement with G.D. Searle & Co. to develop epalons to treat 
insomnia.  In July 1998, Searle terminated its participation in that 
agreement, stating that the program no longer met its needs in light of its 
entire product pipeline.  Since termination of those two agreements, we have 
not yet found new collaboration partners to develop those drugs, and we do 
not have the money to complete development of those drugs.  We do not know if 
we will be able to find new collaboration partners for those drugs.

     WE MAY BE UNABLE TO ENTER INTO COLLABORATION AGREEMENTS IN THE FUTURE.  
We plan to continue to enter into collaboration agreements with 
pharmaceutical companies to develop, market and sell our drug candidates.  We 
do not know if we will be able to find additional potential partners 
interested in developing our drugs.  Also, even if we find potential partners 
interested in our drugs, we do not know if we will be able to enter into 
collaboration agreements with these partners on terms and conditions that we 
find acceptable.  Even if we do enter into additional collaboration 
agreements, we do not know if the collaborations will successfully develop 
drugs for marketing and sale.  If we are unable to secure collaboration 
partners, we will not be able to develop our drug candidates.

WE MUST COMPLY WITH EXTENSIVE GOVERNMENTAL REGULATIONS.

     Our drug candidates are subject to extensive and rigorous regulation by 
the FDA and state and local bodies in the United States and by foreign 
regulatory authorities.  These regulations cover, among other things, product 
development, testing, manufacturing, labeling, sales, advertising and 
promotion.  The process of obtaining FDA and other required regulatory 
approvals is long, expensive and uncertain.  In order to market and sell our 
drugs in the United States and other countries, we must successfully complete 
rigorous testing in animals and humans to prove that the drugs are safe for 
human use and are effective in treating one or more specific brain disorders. 
 We must conduct these tests in a large number of people, including both 
healthy volunteers and people who suffer from the disorder for which the drug 
is intended.  All of our testing must be conducted strictly in accordance 
with standards set up by the FDA and foreign regulators. If we successfully 
complete those tests for one of our drugs, we then must go through an 
extensive regulatory approval process with the FDA, and with foreign 
regulators, before we can begin marketing and selling the drug.

     Even if our drugs are approved for marketing and sale, the FDA and 
foreign regulators may place limitations on the marketing and sale of our 
drugs or require that we conduct additional testing on any or all of our 
drugs after the drugs are approved for marketing and sale.  In addition, each 
drug, the manufacturer of that drug and the manufacturing facilities in which 
the drug is made are subject to continual review and periodic inspections.  
The FDA and regulatory agencies in other countries have the right to withdraw 
approval for a drug later if, for example, patients taking our drug 
experience serious side effects or we have problems in manufacturing the drug.

     We do not know if we will successfully complete the required testing 
with any of our drug candidates.  Any of our drugs may have unacceptable side 
effects or may not be effective in treating the targeted brain disorder.  We 
may have difficulty recruiting healthy or sick volunteers for our trials.  
Either CoCensys or the FDA can halt a trial at any time if either of us 
believes that the participants in the trial are being exposed to unacceptable 
health risks. Even if we do successfully complete the testing for one or more 
of our drugs and prove that our drug is safe for human use and is effective 
in treating one or more specific brain disorders, we do not know if the FDA 
or any other country's regulatory agency will approve the drug for marketing 
and sale in that country. We cannot be sure that our drug candidates will 
receive FDA approval in a timely manner, if at all.  Regulatory agencies may 
limit the uses, or indications, for which any of our products is approved.  
Even if approvals are obtained, the marketing and manufacturing of drug 
products are subject to continuing FDA and other regulatory requirements, 
such as requirements to comply with good manufacturing practices.  The 
failure to comply with such requirements could 

                                      7.

<PAGE>

result in enforcement action, which could adversely affect us and our 
business. Later discovery of problems with a product, manufacturer or 
facility may result in additional restrictions on the product or 
manufacturer, including withdrawal of the product from the market.  The 
government may impose new regulations which could further delay or preclude 
regulatory approval of our drug candidates.  We cannot predict the impact of 
adverse governmental regulation which might arise from future legislative or 
administrative action. Also, we conduct testing on our drugs both in the 
United States and in other countries (principally European countries).  The 
FDA in the United States and regulatory agencies in other countries may be 
unwilling to accept the results from trials not conducted in that agency's 
"home" country.  

OUR PATENTS AND OTHER INTELLECTUAL PROPERTY MAY NOT PROVIDE SUFFICIENT 
PROTECTION.

     Our success depends in part on our ability to protect our technology 
from unauthorized use by obtaining patents in the United States and other 
countries and maintaining our trade secrets.  Also, our drug candidates must 
not infringe on the patent and other proprietary rights of others in the 
United States and other countries where we may market and sell them.  We work 
hard to obtain appropriate patents and to maintain our trade secrets; 
however, patents can be highly uncertain and involve complex legal and 
factual questions.  We do not know if our patent protection and trade secret 
protection will be sufficient to allow CoCensys and our development partners 
to develop, market and sell our drug candidates.

     We file and prosecute patent applications on our own behalf and in 
connection with technology that we have licensed from third parties.  We have 
been issued 23 patents in the United States for our technologies, with 
expiration dates ranging from June 9, 2009 to February 11, 2017, and another 
21 filed patents are pending.  We have also filed for patent protection in 
selected foreign countries.  We will continue to file and prosecute patent 
applications in the United States and in other countries to protect our drug 
candidates, but we do not know if we will be issued additional patents for 
our technologies, either in the United States or in other countries.  We also 
do not know if we will invent any new products or processes for which we can 
receive patent protection in the future.  

     The United States Patent and Trademark Office and similar agencies in 
other countries have substantial backlogs of patent applications waiting for 
consideration.  In the United States, patent applications remain secret until 
the patent is issued; in other countries, patent applications remain secret 
for at least six months after filing.  Therefore, we do not know whether any 
of our competitors has filed patents that may interfere with our ability to 
gain patent protection for our discoveries.  We do not know whether our 
competitors may have invented some of our technology prior to the time that 
we invented the technology.  Generally, only the person who first invents 
technology is entitled to a patent for that technology.  Even if we are the 
first to invent certain technology and we have filed a patent application, we 
do not know when that application will be considered by the United States 
Patent and Trademark Office or any agency in other countries where we may 
have filed a patent application for the technology.

     Patents that have been issued to us are always subject to being 
challenged, invalidated or circumvented; we do not know if any of our patents 
or patents in which we have rights will provide adequate protection for 
CoCensys.  Also, we may have to participate in litigation or interference 
proceedings to determine whether one or more of our patents is valid.  Even 
if we win the litigation or interference proceeding, we may be required to 
spend substantial amounts of money defending the validity of our patents.  We 
do not know if we will have sufficient money to defend all of our patents if 
they are challenged.

     Our success will also depend, in part, on our not infringing patents 
issued to others.  We do not know if any patents held or patent applications 
filed by other people or companies will force us to alter our drug candidates 
or processes, stop development of one or more of our drug candidates or 
obtain licenses, if possible, from those other people or companies.

     A number of pharmaceutical companies, biotechnology companies, 
universities and research institutions have filed patent applications or 
received patents that may be competitive with the our patents and patent 
applications.  We do not know the effect that those patents and patent 
applications may have on our ability to continue to develop and, eventually, 
market and sell our drug products.  If we attempt to obtain licenses to use 
patents held by other people, we do not know if we will be granted licenses 
or whether the terms of those licenses, if granted, will be fair and 
acceptable to CoCensys.

                                      8.

<PAGE>

     If we infringe another person's patent, or we fail to obtain an 
appropriate license to use any other person's technology that is required to 
develop, market and sell our drug products, we may have to participate in 
interference proceedings or litigation, which could result in substantial 
costs, fines and penalties assessed against CoCensys and we may be forced to 
cease all use of the other person's technology.  In fact, we are aware of a 
patent that has issued that contains claims that may, if valid, block us from 
selling certain compounds for one particular indication.  Although we are not 
currently pursing that indication for those compounds, if we do decide to 
pursue that indication, we will have to either institute an interference 
proceeding to determine the validity of the other patent or attempt to 
license rights to the patent from the holder.  We do not know if we will be 
successful if we decide to institute an interference proceeding.  Also, we do 
not know if the patent holder would be willing to license us rights to the 
patent, whether or not on terms acceptable to CoCensys.

     We have developed a substantial amount of information constituting our 
trade secrets.  We rely on confidentiality agreements with our employees, 
consultants and certain contractors to protect these trade secrets.  We do 
not know if the other parties to these agreements will abide by the 
agreements or breach them.  If any agreement is breached, we do not know 
whether we will be able to adequately protect CoCensys from damage caused by 
our trade secrets being disclosed to the public or to a competitor.

WE FACE SIGNIFICANT COMPETITION.

     We are engaged in a highly competitive, rapidly changing field.  
Existing products and therapies, as well as those under development by other 
companies, will compete directly with products that we are seeking to develop 
and market. Competition from fully integrated pharmaceutical companies, 
including larger biotechnology companies and our collaboration partners, is 
intense and is expected to increase.  Most of these companies have 
significantly greater financial resources and expertise than we do in 
research and development, manufacturing, pre-clinical and clinical testing, 
obtaining regulatory approvals, marketing and distribution.  Many of our 
competitors also have significant products to treat neurological and/or 
psychiatric disorders approved or in development and operate large, 
well-funded research and development programs. Academic institutions, 
governmental agencies and other public and private research organizations 
also conduct research, seek patent protection and establish collaborative 
arrangements for product and clinical development and marketing.  Further, we 
face competition based on product efficacy, safety, the timing and scope of 
regulatory approvals, availability of supply, marketing and sales capability, 
reimbursement coverage, price and patent position.  We do not know whether 
our competitors will be able to develop more effective or more affordable 
products, or achieve earlier patent protection or product commercialization 
than us.  If we are unable to compete successfully, our business, financial 
condition and results of operations will be materially adversely affected.

WE MAY NOT BE ABLE TO ATTRACT AND RETAIN KEY EMPLOYEES.

     We are highly dependent on the key members of our scientific and 
management staff.  If we lost the services of one or more key people, we may 
experience significant delays in our development programs.  In addition, we 
rely on consultants and advisors to assist us in conducting our operations 
and formulating our research and development strategy.  Attracting and 
retaining qualified personnel, consultants and advisors is critical to our 
success.  We compete with pharmaceutical companies, biotechnology companies, 
universities and other entities and institutions in recruiting and retaining 
highly qualified scientific and management personnel.  We do not know if we 
will be able to attract and retain qualified personnel on acceptable terms or 
at all. 

WE DO NOT HAVE MANUFACTURING EXPERIENCE.

     We do not have any manufacturing facilities.  We rely solely on contract 
manufactures to produce supplies of our compounds and, at this time, we 
likely will be forced to rely on contract manufactures to produce commercial 
supplies of any of our drug candidates that are approved for marketing and 
sale.  We do not know whether our drugs can be manufactured in commercial 
quantities at an acceptable cost.

     In addition, we must rely on contractors for packaging, labeling and 
distribution of our drug products.  We do not know if we will be able to 
enter into agreements for these services on terms acceptable and fair to us.  
We do not know if our contractors will perform all of their obligations on 
time and in an acceptable manner.  Delays or defaults by our contractors 
could delay or jeopardize our efforts to develop, market and sell our drug 
products. 

                                      9.

<PAGE>

Moreover, our contract manufacturers must adhere to current good 
manufacturing practice regulations enforced by the FDA through its facilities 
inspection program.  We do not know if the facilities that we use will pass 
FDA inspections.  Failure to pass inspections could delay or jeopardize our 
ability to market and sell any future products and materially adversely 
affect our business, financial condition and results of operations. 

WE DO NOT HAVE A SALES FORCE TO SELL FUTURE PRODUCTS.

     We sold our Pharmaceutical Sales and Marketing Division to Watson 
Pharmaceuticals in 1997.  To market products in the future, we must develop 
or acquire, and thereafter maintain and expand, a new sales and marketing 
organization with technical expertise and supporting distribution capability. 
We do not know if we will be successful developing or acquiring and, 
thereafter, maintaining and expanding an appropriate sales and marketing 
organization.  Any failure on our part may have a material adverse effect on 
our business, financial conditions and results of operations.

WE DO NOT KNOW IF OUR PRODUCTS WILL BE COMMERCIALLY SUCCESSFUL OR REIMBURSED 
BY THIRD-PARTY PAYORS.

     Even if one or more of our products prove safe and effective, we do not 
know if the products will be successful commercially.  For example, our 
products may be too difficult or expensive to make, or our products may not 
be acceptable to patients, health care providers and third-party payors.  In 
both the United States any many foreign countries, sales of our products, if 
any, will depend in part on the availability of reimbursement from 
third-party payors, such as government health administration authorities, 
private health insurers and other organizations.  Third-party payors are 
increasingly challenging the price and cost-effectiveness of medical products 
and services.  We do not know whether our drug products will be considered 
cost effective or that adequate third-party reimbursement will be available 
to enable us to maintain price levels sufficient to realize an appropriate 
return on our investment in product development.  In certain foreign 
countries, our products may be subject to governmentally mandated prices.  If 
governments and third-party payors do not provide adequate reimbursement for 
our potential drug products or if foreign governments force unreasonably low 
pricing for our drugs, our business, financial condition and results of 
operations may be materially adversely affected.

WE ARE SUBJECT TO SUBSTANTIAL PRODUCT LIABILITY RISKS.

     Our business exposes us to potential product liability risks if any of 
our compounds or future products cause illness, injury or death.  Although we 
currently have liability insurance covering our clinical trials, our coverage 
may not be sufficient to cover all potential claims.  We do not know if we 
will be able to obtain and maintain such insurance for all of our clinical 
trials and future products.  We will need to increase our insurance coverage 
in the future if we begin to market and sell any of our drug products under 
development. However, we do not know if we will be able to obtain or maintain 
product liability insurance in the future on acceptable terms or with 
adequate coverage against potential liabilities.  A liability claim, 
regardless of merit or eventual outcome, could materially adversely affect 
our business, financial condition and results of operations.

OUR STOCK PRICE IS VERY VOLATILE.

      The securities markets have from time to time experienced significant 
price and volume fluctuations that may be unrelated to the operating 
performance of particular companies.  In addition, the market prices of the

                                      10.

<PAGE>

common stock of many publicly traded biopharmaceutical companies, including 
ours, have in the past been, and can in the future be expected to be, 
especially volatile.  Our stock price may fluctuate greatly as a result of a 
number of factors, including:

     -    announcements of technological innovations or new products by us or by
          our competitors;

     -    developments or disputes concerning patents or proprietary rights;

     -    publicity regarding actual or potential medical results relating to
          drug products that we or our competitors are developing;

     -    regulatory developments in both the United States and foreign
          countries;

     -    public concern as to the safety of biotechnology products; and

     -    economic and other external factors, as well as period-to-period
          fluctuations in our financial results. 

THE SALE OF A LARGE NUMBER OF SHARES OF OUR COMMON STOCK MAY FURTHER DEPRESS OUR
STOCK PRICE.

     The sale of a large number of shares of our common stock in the public 
market, including the shares offered by this prospectus, could depress the 
market price of our common stock.  Substantially all of the outstanding 
shares of our common stock may be sold at any time in the public markets. 
Approximately 5.2 million freely tradable additional shares may be issued on 
exercise of vested options to purchase CoCensys stock.  Current and former 
employees, consultants, officers and directors of CoCensys hold these 
options. 

     We may be required to issue millions of additional shares of CoCensys 
common stock upon conversion of Series E Convertible Preferred Stock.  As of 
March 1, 1999,  5,135 shares of our Series E Convertible Preferred Stock 
remained issued and outstanding.  Each share of the Series E Convertible 
Preferred Stock is convertible into shares of CoCensys common stock at 
discount to the current market price of our common stock.  If converted on 
March 1, 1999, based on the then-applicable conversion price of $0.197 per 
share, the remaining Series E Convertible Preferred Stock would have been 
convertible into approximately 27.5 million additional shares of CoCensys 
common stock.  The number of shares of common stock that may be issued could 
prove to be significantly greater if the market price of our common stock 
declines.  You may experience substantial dilution in your investment from 
issuance of additional common stock on conversion of the Series E Convertible 
Preferred Stock.

     We also may be required to issue several million additional shares of 
CoCensys common stock in fulfillment of our obligations to Warner-Lambert 
Company.  Under our collaboration agreement with Warner-Lambert, we will owe 
Warner-Lambert $1 million on December 31, 1999.  The $1 million is payable in 
common stock or cash, at the election of Warner-Lambert.  If the amount had 
been paid on March 1, 1999, and Warner-Lambert elected to receive the payment 
in stock, we would have had to issue to Warner-Lambert approximately 3.2 
million shares of common stock.  The number of shares of common stock that 
may be issued could prove to be significantly greater if the market price of 
our common stock declines.  CoCensys stockholders could experience 
substantial dilution from issuance of additional common stock in satisfaction 
of our obligation to Warner-Lambert.

FAILURE TO MAINTAIN OUR LISTING ON THE NASDAQ NATIONAL MARKET MAY ADVERSELY 
AFFECT THE LIQUIDITY OF OUR COMMON STOCK AND OUR FINANCIAL CONDITION.

Our common stock is traded on the Nasdaq National Market under the symbol 
"COCN."    In order to maintain our listing on the Nasdaq National Market, we 
must meet a number of listing requirements established by Nasdaq.  Currently, 
we meet all Nasdaq National Market requirements other than the minimum bid 
price. Generally, we must maintain a minimum bid price of $1.00 per share; 
however, our bid price is significantly below $1.00 per share and has been 
below $1.00 per share since October 1998.

                                      11.

<PAGE>

     On December 1, 1998, Nasdaq informed us that our common stock would be 
delisted on March 1, 1999 if we failed to have a closing bid price of at 
least $1.00 per share for ten consecutive days on or before February 28, 
1999.  We have been unable to achieve that closing bid price; however, we 
have applied for a hearing before Nasdaq to discuss our delisting.  That 
hearing is scheduled for April 29, 1999.  While the hearing is pending, 
Nasdaq has said that it will not take further action to delist our common 
stock from the Nasdaq National Market as a result of our stock price.
     
     On January 27, 1999, CoCensys stockholders approved a reverse split of 
our common stock, subject to the Board of Director's right not to implement 
the reverse split, in the alternative ratios of one share for six shares, one 
for seven and one for eight.  CoCensys will consider implementing the reverse 
stock split as necessary to increase the per share price of CoCensys common 
stock in an effort to avoid delisting.
     
      If we cannot maintain continued listing of our common stock on the 
Nasdaq National Market or the Nasdaq SmallCap Market, our common stock could 
trade on the OTC Bulletin Board or in the over-the-counter market in what is 
commonly referred to as the "pink sheets."  If this occurs, a stockholder 
will find it more difficult to dispose of the securities or to obtain 
accurate quotations as to the price of the securities.  In addition, our 
common stock could become subject to the "penny stock" regulations of the 
SEC, which impose additional restrictions on broker-dealers who trade in such 
stock and could severely limit the liquidity of our common stock.  If we do 
not maintain our listing on the Nasdaq National Market or Nasdaq SmallCap, we 
may be required to redeem the Series E Preferred Stock.  Redemption of the 
Series E Preferred Stock would significantly deplete our cash reserves and 
materially adversely affect our operations and financial condition.
     
WE GENERATE HAZARDOUS MATERIALS IN OUR BUSINESS AND OPERATIONS.
 
     Our research and development involves the controlled use of hazardous 
materials, chemicals and various radioactive compounds.  Although we believe 
that our safety procedures for handling and disposing of such materials 
comply with the standards prescribed by state and federal regulations, the 
risk of accidental contamination or injury from these materials cannot be 
completely eliminated.  If an accident occurs, we could be held liable for 
any damages that result and any such liability could exceed our resources.  
Also, we may incur substantial costs to comply with environmental regulations 
if we ever decide to develop manufacturing capacity.

                                      12.

<PAGE>

                                  USE OF PROCEEDS

     CoCensys will not receive any proceeds from the sales of common stock by
the selling stockholders in the offering.

                                SELLING STOCKHOLDERS


     The following table sets forth the names of the selling stockholders, 
the number of shares of common stock owned beneficially by each of them as of 
March 1, 1999, the number of shares which may be offered pursuant to this 
prospectus and the number of shares to be owned by each selling stockholder 
after this offering.  This information is based upon information provided by 
the selling stockholders.  Because the selling stockholders may offer all, 
some or none of their common stock, no definitive estimate as to the number 
of shares thereof that will be held by the selling stockholders after such 
offering can be provided.  
     
     The number of shares set forth  in the table represents an estimate of 
the number of shares of common stock to be offered by the selling 
stockholders.  The selling stockholders will acquire such shares upon 
conversion of outstanding shares of Series E Convertible Preferred Stock and 
exercise of outstanding warrants.  The actual number of shares of common 
stock issuable upon conversion of Series E Convertible Preferred Stock and 
exercise of warrants is indeterminate, is subject to adjustment and could be 
materially less or more than such estimated number depending on factors which 
cannot be predicted by the Company at this time, including, among other 
factors, the future market price of the common stock.  The actual number of 
shares of common stock offered hereby, and included in the registration 
statement of which this Prospectus is a part, includes such additional number 
of shares of common stock as may be issued or issuable upon conversion of the 
Series E Convertible Preferred Stock and exercise of the warrants by reason 
of any stock split, stock dividend or similar transaction involving the 
common stock, in accordance with Rule 416 under the Securities Act.

<TABLE>
<CAPTION>
                                                                                     Beneficial Ownership
                                                                                         After Offering
                                                                     Maximum       --------------------------- 
                                                                     Number of
                                                 Shares of Common    Shares of      Number of
                                                Stock Beneficially    Common        Shares of
                                                 Owned Prior to      Stock Being     Common
 Name of Selling Stockholder                     Offering (1)(2)     Offered (3)     Stock(4)    Percent(1)(2)
 ---------------------------                    ------------------   -----------   -----------   -------------
 <S>                                            <C>                  <C>           <C>           <C>
 RGC International Investors,  LDC(5)  . . . .      25,433,628       15,687,500     6,072,517       10.3%

 Heracles Fund(6)  . . . . . . . . . . . . . .       5,647,500        5,647,500             0         0

 Themis Partners L.P.(7) . . . . . . . . . . .       3,765,000        3,765,000             0         0
</TABLE>

- -------------------
(1)  Shares of common stock beneficially owned includes common stock issuable on
     conversion of Series E Convertible Preferred Stock (including accrued and
     capitalized dividends) and exercise of warrants as of March 1, 1999. 
     Common stock issuable on conversion of Series E Convertible Preferred Stock
     is based on a conversion price of $0.158 per share, which is less than the
     conversion price applicable at March 1, 1999.  If the shares of Series E
     Convertible Preferred Stock actually had been converted on March 1, 1999,
     the applicable conversion price would have been $0.197 per share.  The
     actual number of shares issuable on conversion of the Series E Convertible
     Preferred Stock will vary based on the conversion price applicable at the
     time of the conversion plus such other adjustments to the conversion price
     that may be applicable at that time.  Percent of beneficial ownership is
     calculated assuming 33,508,678 shares of common stock outstanding as of
     March 1, 1999.

(2)  Pursuant to its terms, the Series E Convertible Preferred Stock is
     convertible by any holder only to the extent that the number of shares of
     common stock thereby issuable, together with the number of shares of common
     stock owned by such holder and its affiliates (but not including shares of
     common stock 

                                      13.
<PAGE>

     underlying unconverted Series E Convertible Preferred Stock) would not 
     exceed 4.9% of the then outstanding common stock as determined in 
     accordance with Section 13(d) of the Exchange Act.  Accordingly, the 
     number of shares of common stock set forth in the table as beneficially 
     owned by the selling stockholders exceeds the number of shares of 
     common stock that they could own beneficially at any given time as a 
     result of  their ownership of the Series E Convertible Preferred Stock. 
      In that regard, beneficial ownership of the selling stockholders set 
     forth in the table is not determined in accordance with Rule 13d-3 
     under the Exchange Act.  This limitation may be waived by the holder 
     upon 61 days notice to CoCensys. Except as indicated in the footnotes 
     to this table and pursuant to applicable community property laws, the 
     persons named in the table have sole voting and investment power with 
     respect to all shares of common stock beneficially owned.

(3)  Represents the maximum number of shares of common stock which will be sold
     by each selling stockholder under this prospectus upon conversion of Series
     E Convertible Preferred Stock and exercise of warrants.

(4)  Assumes the sale of all the common stock offered hereby.  RGC International
     Investors, LDC, has the right to sell an additional 3,673,611 shares of
     CoCensys common stock issuable upon conversion of Series E Convertible
     Preferred Stock and exercise of warrants pursuant to a prospectus dated
     September 4, 1998; shares of common stock held after the offering assumes
     that RGC International Investors, LDC also sold all shares available under
     such prospectus.

(5)  Includes up to 25,152,377 shares of common stock issuable upon the
     conversion of Series E Convertible Preferred Stock and up to 281,250 shares
     of common stock issuable upon the exercise of warrants held of record by
     RGC International Investors, LDC.

(6)  Includes up to 5,546,250 shares of common stock issuable upon the
     conversion of Series E Convertible Preferred Stock and up to 101,250 shares
     of common stock issuable upon the exercise of warrants held of record by
     Heracles Fund.

(7)  Includes up to 3,697,500 shares of common stock issuable upon the
     conversion of Series E Convertible Preferred Stock and up to 67,500 shares
     of common stock issuable upon the exercise of warrants held of record by
     Themis Partners L.P.

                                PLAN OF DISTRIBUTION

The common stock offered hereby may be sold by the selling stockholders or by 
pledgees, donees, transferees or other successors in interest that receive 
such shares as a gift, partnership distribution or other non-sale related 
transfer. The common stock may be sold from time to time in transactions in 
the over-the-counter market, in negotiated transactions, or a combination of 
such methods of sale, at fixed prices which may be changed, at market prices 
prevailing at the time of sale, at prices related to prevailing market prices 
or at negotiated prices.  The selling stockholders may effect such 
transactions by selling the common stock to or through broker-dealers, 
including block trades in which brokers or dealers will attempt to sell the 
common stock as agent but may position and resell the block as principal to 
facilitate the transaction, or in one or more underwritten offerings on a 
firm commitment or best effort basis. Sales of selling stockholders' shares 
of common stock may also be made pursuant to Rule 144 under the Securities 
Act, where applicable.

     To the extent required under the Securities Act, the aggregate amount of 
selling stockholders' shares of common stock being offered and the terms of 
the offering, the names of any such agents, brokers, dealers or underwriters 
and any applicable commission with respect to a particular offer will be set 
forth in an accompanying Prospectus supplement. Any underwriters, dealers, 
brokers or agents participating in the distribution of the common stock may 
receive compensation in the form of underwriting discounts, concessions, 
commissions or fees from a selling stockholder and/or purchasers of selling 
stockholders' shares of common stock, for whom they may act (which 
compensation as to a particular broker-dealer might be in excess of customary 
commissions).

     From time to time, one or more of the selling stockholders may pledge, 
hypothecate or grant a security interest in some or all of the shares of 
common stock owned by them, and the pledgees, secured parties or persons to 
whom such securities have been hypothecated shall, upon foreclosure in the 
event of default, be deemed to be selling stockholders hereunder.  In 
addition, a selling stockholder may, from time to time, sell short the 
CoCensys 

                                      14.

<PAGE>

common stock, and in such instances, this Prospectus may be delivered in 
connection with such short sales and the shares of common stock offered 
hereby may be used to cover such short sales.

     From time to time one or more of the selling stockholders may transfer, 
pledge, donate or assign such selling stockholders' shares of common stock to 
lenders or others and each of such persons will be deemed to be a "selling 
stockholder" for purposes of this Prospectus.  The number of selling 
stockholders' shares of common stock beneficially owned by those selling 
stockholders who so transfer, pledge, donate or assign shares of common stock 
will decrease as and when they take such actions.  The plan of distribution 
for selling stockholders' shares of common stock sold hereunder will 
otherwise remain unchanged, except that the transferees, pledgees, donees or 
other successors will be selling stockholders hereunder.

     A selling stockholder may enter into hedging transactions with 
broker-dealers and the broker-dealers may engage in short sales of the common 
stock in the course of hedging the positions they assume with such selling 
stockholder, including, without limitation, in connection with distributions 
of the common stock by such broker-dealers.  A selling stockholder may also 
enter into option or other transactions with broker-dealers that involve the 
delivery of the common stock to the broker-dealers, who may then resell or 
otherwise transfer such common stock.  A selling stockholder may also loan or 
pledge the common stock to a broker-dealer and the broker-dealer may sell the 
common stock so loaned or upon a default may sell or otherwise transfer the 
pledged common stock.

     In order to comply with the securities laws of certain states, if 
applicable, the common stock will be sold in such jurisdictions only through 
registered or licensed brokers or dealers.  In addition, in certain states 
the Shares may not be sold unless they have been registered or qualified for 
sale in the applicable state or an exemption from the registration or 
qualification requirement is available and is complied with.

     The selling stockholders and any broker-dealers or agents that 
participate with the selling stockholders in the distribution of the common 
stock may be deemed to be "underwriters" within the meaning of the Securities 
Act, and any commissions received by them and any profit on the resale of 
common stock purchased by them may be deemed to be underwriting commissions 
or discounts under the Securities Act.

     The selling stockholders and any other persons participating in the sale 
or distribution of the Shares will be subject to applicable provisions of the 
Exchange Act and the rules and regulations thereunder, which provisions may 
limit the timing of purchases and sales of any of the common stock by the 
selling stockholders or any other such person.  The foregoing may affect the 
marketability of the common stock.

     The shares of common stock were originally issued to the selling 
stockholders pursuant to an exemption from the registration requirements of 
the Securities Act provided by Section 4(2) thereof.  The Company agreed to 
register the common stock under the Securities Act and to indemnify and hold 
the selling stockholders harmless against certain liabilities under the 
Securities Act that could arise in connection with the sale by the selling 
stockholders of the common stock.  The Company has agreed to pay all 
reasonable fees and expenses incident to the filing of this registration 
statement, and a related registration statement covering 12,350,000 shares of 
CoCensys common stock, estimated in the aggregate to be approximately 
$85,000.  The Company also agreed to reimburse Rose Glen Capital Management, 
L.P., investment manager to RGC International Investors, LDC, for expenses 
incurred by the selling stockholders in their purchase of the Series E 
Preferred Stock and Warrants up to a maximum of $30,000.

                                   LEGAL MATTERS

     The validity of the common stock offered hereby will be passed upon for 
the Company by Robert R. Holmen, Esq., Vice President and General Counsel of 
CoCensys, Inc.

                                      EXPERTS

     Ernst & Young LLP, independent auditors, have audited our financial 
statements included in our Annual Report on Form 10-K for the year ended 
December 31, 1998, as set forth in their report, which is incorporated in this 
Prospectus by reference. Our financial statements are incorporated by 
reference in reliance on their report, given on their authority as experts in 
accounting and auditing.

                                      15.
<PAGE>

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
About CoCensys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
Where You Can Find More Information. . . . . . . . . . . . . . . . . . . .   3
Forward Looking Statements . . . . . . . . . . . . . . . . . . . . . . . .   4
Risk Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
Use of Proceeds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
Selling Stockholders . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
Plan of Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
Legal Matters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
Experts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
</TABLE>

                               25,100,000 SHARES

                                COCENSYS, INC.

                                 COMMON STOCK


                                  ----------

                                  PROSPECTUS

                                  ----------


                                APRIL 5, 1999

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

                                      PART II

                       INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the various expenses expected to be incurred
by the Registrant in connection with the sale and distribution of the securities
being registered hereby.  All amounts are estimated except the Securities and
Exchange Commission registration fee and the Nasdaq National Market listing fee.

<TABLE>
<S>                                                           <C>
        SEC Registration Fee  . . . . . . . . . . .           $   1,647
        Nasdaq National Market Listing Fee  . . . .               2,000
        Accounting Fees and Expenses  . . . . . . .               5,000
        Legal Fees and Expenses   . . . . . . . . .              15,000
        Printing Expenses   . . . . . . . . . . . .               1,000
        Miscellaneous Fees and Expenses . . . . . .               1,353

        Total                                                 $  26,000
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     The Registrant's Certificate of Incorporation and Bylaws include 
provisions to (i) eliminate the personal liability of its directors for 
monetary damages resulting from breaches of their fiduciary duty to the 
extent permitted by Section 102(b)(7) of the General Corporation Law of 
Delaware (the "Delaware Law") and (ii) authorize the Registrant to indemnify 
its directors and officers to the fullest extent permitted by Section 145 of 
the Delaware Law, including circumstances in which indemnification is 
otherwise discretionary.  Pursuant to Section 145 of the Delaware Law, a 
corporation generally has the power to indemnify its present and former 
directors, officers, employees and agents against expenses incurred by them 
in connection with any suit to which they are, or are threatened to be made, 
a party by reason of their serving in such positions so long as they acted in 
good faith and in a manner they reasonably believed to be in, or not opposed 
to, the best interests of a corporation, and with respect to any criminal 
action, they had no reasonable cause to believe their conduct was unlawful.  
The Registrant believes that these provisions are necessary to attract and 
retain qualified persons as directors and officers. These provisions do not 
eliminate liability for breach of the director's duty of loyalty to the 
Registrant or its stockholders, for acts or omissions not in good faith or 
involving intentional misconduct or knowing violations of law, for any 
transaction from which the director derived an improper personal benefit or 
for any willful or negligent payment of any unlawful dividend or any unlawful 
stock purchase agreement or redemption.

     The Registrant has entered into agreements with its directors and 
executive officers that require the Registrant to indemnify such persons 
against expenses, judgments, fines, settlements and other amounts actually 
and reasonably incurred (including expenses of a derivative action) in 
connection with any proceeding, whether actual or threatened, to which any 
such person may be made a party by reason of the fact that such person is or 
was a director or officer of the Registrant or any of its listed enterprises, 
provided such person acted in good faith and in a manner such person 
reasonably believed to be in or not opposed to the best interests of the 
Registrant and, with respect to any criminal proceeding, had no reasonable 
cause to believe his or her conduct was unlawful. The indemnification 
agreements also set forth certain procedures that will apply in the event of 
a claim for indemnification thereunder.

     The Registrant has purchased an insurance policy covering the officers 
and directors of the Registrant with respect to certain liabilities arising 
under the Securities Act or otherwise.

                                    II-1

<PAGE>

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

     The following exhibits are filed as part of this Registration Statement.

<TABLE>
<CAPTION>
EXHIBIT 
NUMBER         DESCRIPTION OF DOCUMENT
- --------       -----------------------
<S>       <C>
    5.1   Opinion of Robert R. Holmen, Esq.

   23.1   Consent of Independent Auditors

   23.2   Consent of Robert R. Holmen, Esq.  Reference is made to Exhibit 5.1.

   24.1   Power of Attorney.  Reference is made to pages II-4 and II-5.
</TABLE>

ITEM 17.  UNDERTAKINGS

     The undersigned Registrant hereby undertakes:

     (1)  To file, during any period in which offers or sales are being made, 
a post-effective amendment to this Registration Statement: (i) to include any 
prospectus required by Section 10(a) (3) of the Securities Act; (ii) to 
reflect in the prospectus any facts or events arising after the effective 
date of the Registration Statement (or the most recent post-effective 
amendment thereof) which, individually or in the aggregate, represent a 
fundamental change in the information set forth in the Registration 
Statement; and (iii) to include any material information with respect to the 
plan of distribution not previously disclosed in the Registration Statement 
or any material change to such information in the Registration Statement; 
provided, however, that (i) and (ii) do not apply if the Registration 
Statement is on Form S-3 or Form S-8, and the information required to be 
included in a post-effective amendment by (i) and (ii) is contained in 
periodic reports filed with or furnished to the Commission by the Registrant 
pursuant to Section 13 or Section 15(d) of the Exchange Act that are 
incorporated by reference in the Registration Statement.

     (2)  That, for the purpose of determining any liability under the 
Securities Act, each such post-effective amendment shall be deemed to be a 
new registration statement relating to the securities offered therein, and 
the offering of such securities at that time shall be deemed to be the 
initial bona fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment 
any of the securities being registered which remain unsold at the termination 
of the offering.

     Insofar as indemnification for liabilities arising under the Securities 
Act may be permitted to directors, officers and controlling persons of the 
Registrant pursuant to the foregoing provisions, or otherwise, the Registrant 
has been advised that in the opinion of the Securities and Exchange 
Commission such indemnification is against public policy as expressed in the 
Securities Act and is, therefore, unenforceable.  In the event that a claim 
for indemnification against such liabilities (other than the payment by the 
Registrant of expenses incurred or paid by a director, officer or controlling 
person of the Registrant in the successful defense of any action, suit or 
proceeding) is asserted by such director, officer or controlling person in 
connection with the securities being registered, the Registrant will, unless 
in the opinion of its counsel the matter has been settled by controlling 
precedent, submit to a court of appropriate jurisdiction the question whether 
such indemnification by it is against public policy as expressed in the 
Securities Act and will be governed by the final adjudication of such issue.

     The undersigned Registrant hereby undertakes that, for purposes of 
determining any liability under the Securities Act, each filing of the 
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the 
Exchange Act (and, where applicable, each filing of an employee benefit 
plan's annual report pursuant to Section 15(d) of the Exchange Act) that is 
incorporated by reference in the Registration Statement shall be deemed to be 
a new registration statement relating to the securities offered therein, and 
the offering of such securities at that time shall be deemed to be the 
initial bona fide offering thereof.

                                    II-2

<PAGE>

     The undersigned Registrant hereby undertakes that:

     (1)  For purposes of determining any liability under the Securities Act, 
the information omitted from the form of prospectus filed as part of this 
Registration Statement in reliance upon Rule 430A and contained in a form of 
prospectus filed by the Registrant pursuant to Rule 424(b) (1) or (4) or 
497(h) under the Securities Act shall be deemed to be part of this 
Registration Statement as of the time it was declared effective.

     (2)  For purposes of determining any liability under the Securities Act, 
each post-effective amendment that contains a form of prospectus shall be 
deemed to be a new registration statement relating to the securities offered 
therein, and the offering of such securities at that time shall be deemed to 
be the initial bona fide offering thereof.

                                     II-3

<PAGE>

                                     SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the Company 
certifies that it has reasonable grounds to believe that it meets all of the 
requirements for filing on Form S-3 and has duly caused this Registration 
Statement on Form S-3 to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Irvine, County of Orange, State of 
California, on the 1st day of April, 1999.

                              COCENSYS, INC.


                              By:  /s/ F. Richard Nichol, Ph.D.
                                   --------------------------------------
                                   F. Richard Nichol, Ph.D.
                                   President and Chief Executive Officer

                                 POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature 
appears below does hereby constitute and appoint jointly and severally, F. 
Richard Nichol, Ph.D., and Robert R. Holmen, or either of them, as his or her 
true and lawful attorneys-in-fact and agents, with full power of substitution 
and resubstitution, for him or her and in his or her name, place and stead, 
in any and all capacities, to sign the Registration Statement filed herewith 
and any and all amendments to said Registration Statement (including 
post-effective amendments and registration statements filed pursuant to Rule 
462 and otherwise), and to file the same, with all exhibits thereto, and 
other documents in connection therewith, with the Securities and Exchange 
Commission, granting unto said attorneys-in-fact and agents, and each of 
them, full power and authority to do and perform each and every act and thing 
requisite and necessary to be done in connection therewith, as fully to all 
intents and purposes as he or she might or could do in person, hereby 
ratifying and confirming all that said attorneys-in-fact and agents, or any 
of them, or their substitute of substitutes, may lawfully do or cause to be 
done by virtue hereof.

                                     II-4

<PAGE>


     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the persons whose signatures
appear below, which persons have signed such Registration Statement in the
capacities and on the dates indicated:

<TABLE>
<CAPTION>
             SIGNATURE                          TITLE                       DATE
             ---------                          -----                       ----
   <S>                               <C>                                <C>
   /s/ F. Richard Nichol, Ph.D.      President, Chief Executive         April 1, 1999
   -------------------------------     Officer and Chairman  
      F. Richard Nichol Ph.D.          (PRINCIPAL EXECUTIVE OFFICER)

        /s/ Robert R. Holmen         Vice President and General         April 1, 1999
   -------------------------------     Counsel (PRINCIPAL  
         Robert R. Holmen              FINANCIAL OFFICER)  

         /s/ Thomas Miller           Controller                         April 1, 1999
   -------------------------------     (PRINCIPAL ACCOUNTING OFFICER)
           Thomas Miller

        /s/ Lowell E. Sears          Director                           April 1, 1999
   -------------------------------
          Lowell E. Sears

     /s/ James C. Blair, Ph.D.       Director                           April 1, 1999
   -------------------------------
       James C. Blair, Ph.D.

     /s/ Kelvin W. Gee, Ph.D.        Director                           April 1, 1999
   -------------------------------
       Kelvin W. Gee, Ph.D.

       /s/ Alan C. Mendelson         Director                           April 1, 1999
   -------------------------------
         Alan C. Mendelson

   /s/ Timothy J. Rink, M.D., Sc.D.  Director                           April 1, 1999
   -------------------------------
   Timothy J. Rink, M.D., Sc.D.

      /s/ Robert L. Roe, M.D.        Director                           April 1, 1999
   -------------------------------
        Robert L. Roe, M.D.

      /s/ Eckard Weber, M.D.         Director                           April 1, 1999
   -------------------------------
        Eckard Weber, M.D.
</TABLE>

                                     II-5
<PAGE>

                                 INDEX TO EXHIBITS

<TABLE>
<CAPTION>

EXHIBIT 
NUMBER         DESCRIPTION OF DOCUMENT
- ---------      -----------------------
<S>            <C>
     5.1       Opinion of Robert R. Holmen, Esq.

    23.1       Consent of Independent Auditors

    23.2       Consent of Robert R. Holmen, Esq. Reference is made to Exhibit 5.1.
</TABLE>


<PAGE>
                                                                 EXHIBIT 5.1

                                  [COCENSYS, INC.]

April 1, 1999

CoCensys, Inc.
201 Technology Drive
Irvine, CA 92618

Ladies and Gentleman:

You have requested my opinion with respect to certain matters in connection 
with the filing by CoCensys, Inc., a Delaware corporation (the "Company"), of 
a Registration Statement on Form S-3 (the "Registration Statement") with the 
Securities and Exchange Commission (the "Commission"), covering the offering 
of a total of 25,100,000 shares of the Company's common stock with a par 
value of $0.001 (the "Shares") issuable upon conversion of 5,135 shares of 
Series E Convertible Preferred Stock (the "Preferred Stock") and the exercise 
of warrants to purchase up to 100,000 shares of the Company's common stock 
(the "Warrants") issued by the Company in November 1998 pursuant to a private 
placement in June 1998 (the "Private Placement").  All of the Shares are to 
be sold by certain stockholders as described in the Registration Statement.

In connection with this opinion, I have examined and relied upon the 
Registration Statement and related Prospectus included therein, the Company's 
Amended and Restated Certificate of Incorporation and Bylaws, and the 
originals or copies certified to our satisfaction of such records, documents, 
certificates, memoranda and other instruments as in my judgment are necessary 
or appropriate to enable me to render the opinion expressed below.  I have 
assumed the genuineness and authenticity of all documents submitted to me as 
originals, and the conformity to originals of all documents where due 
execution and delivery are a prerequisite to the effectiveness thereof. 

On the basis of the foregoing, and in reliance thereon, I am of the opinion 
that the Shares, when issued and delivered upon conversion of the Preferred 
Stock in accordance with the terms of the Certificate of Powers, Designation, 
Preferences, Rights and Limitations of the Preferred Stock and exercise of 
the Warrants in accordance with their terms, will be validly issued, fully 
paid and nonassessable.

I consent to the reference to me under the caption "Legal Matters" in the 
Prospectus included in the Registration Statement and to the filing of this 
opinion as an exhibit to the Registration Statement.

Very truly yours,



By:  /s/ Robert R. Holmen


<PAGE>

                                                                 EXHIBIT 23.1

                     CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" in the 
Registration Statement (Form S-3) and related Prospectus of CoCensys, Inc. 
for the registration of 25,100,000 shares of its common stock and to the 
incorporation by reference therein of our report dated January 29, 1999 
(except for the second paragraph of Note 2 as to which the date is March 24, 
1999), with respect to the financial statements of CoCensys, Inc. included in 
its Annual Report (Form 10-K) for the year ended December 31, 1998, filed 
with the Securities and Exchange Commission.

                                             /s/Ernst & Young LLP

Orange County, California
March 31, 1999




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