DISCOVERY LABORATORIES INC /DE/
S-3/A, 1999-09-30
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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     As filed with the Securities and Exchange Commission on August 27, 1999
================================================================================
                                                      Registration No. 333-86105
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 AMENDMENT NO. 2
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                          DISCOVERY LABORATORIES, INC.
             (Exact Name of Registrant as Specified in its Charter)
                          ----------------------------
<TABLE>
<CAPTION>

<S>                                                      <C>
            Delaware                             350 Main Street                13-3711775
  (State or Other Jurisdiction of                  Suite 307                   (I.R.S. Employer
     Incorporation or Organization)       Doylestown, Pennsylvania 18901    Identification Number)
(Address, Including Zip Code and Telephone Number, Including Area Code, of Registrant's Principal Executive Offices)

                          -----------------------------
                          Steve H. Kanzer, C.P.A., Esq.
                              Chairman of the Board
                                 350 Main Street
                                    Suite 307
                         Doylestown, Pennsylvania 18901
                                 (215) 340-4699
 (Name, address, including zip code, and telephone number, including area code, of agent for service)
</TABLE>

                            ------------------------
                                   Copies to:
                             Steven A. Fishman, Esq.
                                Battle Fowler LLP
                               75 East 55th Street
                            New York, New York 10022
                                 (212) 856-7000
                            ------------------------

      Approximate date of commencement of proposed sale to public:  From time to
time or at one time after the effective date of this  registration  statement as
determined by market conditions.
      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 only 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. / /

                            -----------------------
      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  which  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.

================================================================================

864725.6

<PAGE>

(RED HERRING)
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 it is not  soliciting  an  offer  to buy  these
securities in any state where such offer or sale is not permitted.




================================================================================
PRELIMINARY PROSPECTUS         SUBJECT TO COMPLETION, DATED SEPTEMBER __, 1999
                                7,192,870 Shares

                          DISCOVERY LABORATORIES, INC.

                                  Common Stock


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


      All of the shares of common stock covered by this  prospectus are owned by
the  stockholders  listed in the  section  of this  prospectus  called  "Selling
Stockholders"  or are  issuable on  exercise  of  warrants  owned by the selling
stockholders.  The selling stockholders may sell any or all of their shares from
time to time. See "Plan of Distribution."

      We  will  not  receive  any of  the  proceeds  of  sales  by  the  selling
stockholders.  We have  agreed to bear all  expenses  related to this  offering,
other than underwriting  discounts and commissions and any transfer taxes on the
shares of common  stock being  offered.  The  registration  of the common  stock
covered  by this  Prospectus  does not  necessarily  mean that any of the common
stock will be offered or sold by the selling stockholders.

      Our common stock is traded on the Nasdaq  SmallCap Market under the symbol
"DSCO."

      The common stock offered hereby  involves a high degree of risk. See "Risk
Factors"  beginning on page 4 for certain  factors  relevant to an investment in
our common stock.

                               --------------------
      Neither the  Securities and Exchange  Commission nor any state  securities
commission has approved or disapproved of these securities or determined if this
prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.


               The date of this Prospectus is September ___, 1999.




================================================================================

864725.6

<PAGE>






                                TABLE OF CONTENTS

                                                                            Page

PROSPECTUS SUMMARY.............................................................1

COMPANY SUMMARY................................................................1

RISK FACTORS...................................................................2

FORWARD-LOOKING STATEMENTS....................................................10

USE OF PROCEEDS...............................................................11

SELLING STOCKHOLDERS..........................................................11

PLAN OF DISTRIBUTION..........................................................12

WHERE YOU CAN FIND MORE INFORMATION...........................................13

INFORMATION INCORPORATED BY REFERENCE.........................................13

EXPERTS.......................................................................14

LEGAL MATTERS.................................................................14


864725.6

<PAGE>


                               PROSPECTUS SUMMARY

      Because this is a summary, it does not contain all the details that may be
important to you. You should read this entire  prospectus  carefully  before you
invest.


                                 COMPANY SUMMARY

      We are a  development  stage  pharmaceutical  company  that is  focused on
developing  compounds  intended  for  neonatal  use in  critical  care  hospital
settings. We are also developing our lead product candidate for the treatment of
acute  respiratory  distress  syndrome and acute lung injury.  Our two lead drug
candidates are directed towards  respiratory  indications.  We may seek to enter
into  collaborations  with corporate partners for manufacturing and marketing of
these drugs.

      Our lead product is  Surfaxin(R),  a peptide (or small  protein  molecule)
phospholipid  formulation  containing a  proprietary,  synthetic  peptide called
sinapultide.  Surfaxin(R) is patterned after a human  surfactant  protein and is
intended to be used for the  treatment of several  conditions  characterized  by
insufficient   surfactant.   The  lungs  produce  surfactant,  a  detergent-like
substance  consisting  mainly of phospholipids (a derivative in which one of the
fatty  acids has been  replaced  by a  phosphate).  Lung  surfactants  lower the
surface tension of the fluid normally  present within the alveoli (air sacs). In
the absence of  sufficient  surfactants,  these air sacs tend to collapse.  As a
result, the lungs do not absorb sufficient oxygen. Surfaxin(R) is a synthetic or
artificial  surfactant designed to replace lung surfactant in patients suffering
from a surfactant deficit.  Replacement  surfactants are currently approved only
for treating  respiratory  distress syndrome in premature infants.  Infants with
this condition,  as well as infants born with meconium (a component of the fetal
bowel) in their lungs, which can lead to meconium aspiration syndrome, typically
suffer   from   insufficient   surfactant.   This   condition   can  lead  to  a
life-threatening  loss of pulmonary function.  In addition,  patients with acute
respiratory  distress  syndrome  and acute lung  injury  typically  suffer  from
surfactant  deficiency as well. Acute  respiratory  distress  syndrome and acute
lung injury can result from pneumonia,  aspiration of gastric contents,  trauma,
smoke inhalation, head injury, and a variety of other events.

      We are also developing SuperVent(TM) as a stable,  aerosolized therapy for
airway diseases such as cystic fibrosis and chronic bronchitis. These conditions
are characterized by inflammation,  injurious oxidation (a condition where atoms
in tissue  lose  electrons,  which can  result  in  damage  to the  tissue)  and
excessive mucus.  Cystic fibrosis is a progressive,  lethal respiratory  disease
that  afflicts  approximately  23,000  patients  in  the  United  States  and  a
comparable  number in Europe. It is the most common lethal genetic disease among
Caucasians. Because of this genetic defect, cystic fibrosis mucus is excessively
viscous, as a result of which it does not flow and adheres to airway walls. This
can lead to gradual  destruction of the lungs of cystic fibrosis  patients.  The
inability  to clear  mucus from the lungs can lead to  blockage  of the  airways
usually  beginning  in the smaller  airways  and  alveoli.  A new  therapy  that
minimizes the  complications of cystic fibrosis could have a major impact on the
length and quality of life of its patients.

      We are conducting clinical trials of Surfaxin(R) for treatment of Meconium
aspiration  syndrome  and acute  respiratory  distress  syndrome  and acute lung
injury and SuperVent(TM) for treatment of cystic fibrosis.

      Discovery Laboratories was incorporated in Delaware on November 6, 1992 as
Ansan,  Inc.  On November  25,  1997,  Discovery  Laboratories,  Inc.,  a former
Delaware  corporation  ("Old  Discovery"),  was merged  with and into  Discovery
Laboratories,  then known as Ansan.  In connection with this merger in 1997, our
name was changed to Discovery  Laboratories,  Inc. On June 16,  1998,  Discovery
Laboratories completed the acquisition of the then outstanding minority interest
in Acute Therapeutics, Inc.

      Surfaxin(R) and  SuperVent(TM)  are our  trademarks.  This prospectus also
includes  product names,  trademarks and trade names of other  companies,  which
names are the exclusive property of the holders thereof.

      Our  executive  offices are located at 350 South Main  Street,  Suite 307,
Doylestown,  Pennsylvania  18901. Our telephone number is (215) 340-4699 and our
facsimile number is (215) 340-3940.

864725.6


                                       1
<PAGE>




                                  RISK FACTORS

      Investing in our common stock  involves a high degree of risk.  You should
consider  carefully  the following  risk factors  together with all of the other
information  included or incorporated by reference in this prospectus before you
decide to  purchase  shares of our  common  stock.  The risks and  uncertainties
described below are not the only ones facing our company.  Additional  risks and
uncertainties not presently known to us or that we currently deem immaterial may
also impair our business operations.

      If any of the following  risks  actually  occur,  our business,  financial
condition and results of operations could be materially and adversely  affected.
In this event, the trading price of our common stock could decline and you could
lose part or all of your investment.

BECAUSE WE ARE A DEVELOPMENT  STAGE  COMPANY,  WE MAY NOT BE ABLE TO DEVELOP AND
MARKET OUR PRODUCTS, AND EVEN IF WE DO, WE MAY NOT GENERATE ENOUGH REVENUE TO BE
PROFITABLE.

      We are a development  stage  company.  Therefore,  you must evaluate us in
light of the  uncertainties  and  complexities  present in a  development  stage
pharmaceutical   company.  Our  product  candidates  are  in  the  research  and
development  stage  and,  accordingly,  we have not begun to market or  generate
revenues from the commercialization of any of these products. Our products under
development  will  require  significant   time-consuming  and  costly  research,
development,  preclinical  studies,  clinical testing,  regulatory  approval and
significant additional investment prior to their  commercialization.  We may not
be able to develop and commercialize our products. We cannot assure you that our
products under development,  if successfully developed, will generate sufficient
or sustainable revenues to enable us to be profitable.

BECAUSE WE DO NOT YET HAVE PRODUCT  REVENUES  AND HAVE A HISTORY OF LOSSES,  OUR
FUTURE PROFITABILITY IS UNCERTAIN.

      We are not currently generating any product revenues and we expect that we
will not generate significant product revenues for the foreseeable future, if at
all. As a  development  stage  company  engaged in  conducting  development  and
clinical testing activities,  we expect to generate significant operating losses
for the foreseeable future. We expect to incur significant  increasing operating
losses over the next several years. To achieve profitable operations, we, either
alone or with others,  must successfully  develop and obtain regulatory approval
for marketing our products. We cannot assure you that we will:

      --    enter into potentially  necessary  collaborative  arrangements  with
            third parties;

      --    successfully complete preclinical or clinical trials;

      --    obtain required regulatory approvals;

      --    successfully develop, manufacture and market product candidates; or

      --    generate additional revenues or profitability.

      If we fail to achieve any of the above  goals,  we will  continue to incur
loss from operations and may not be able to continue our operations.

THE TYPES OF PRODUCTS WE ARE  DEVELOPING ARE SUBJECT TO RISKS THAT ARE DIFFICULT
TO FORESEE, AND OUR DEVELOPMENT EFFORTS MAY BE UNSUCCESSFUL.

      Our development of products is subject to the risks of failure inherent in
the  development  of new  pharmaceutical  products  based on  innovative  or new
technologies.  During the development  process,  we could experience  unforeseen
problems that could delay us from completing the development of our products. We
cannot assure you that:

      --    our research and development efforts will be successful;

      --    our proposed  products will be  commercially  viable or successfully
            marketed.


864725.6

                                       2
<PAGE>

IF WE ARE NOT ABLE TO RAISE ADDITIONAL CAPITAL WE WILL BE UNABLE TO CONTINUE OUR
RESEARCH AND DEVELOPMENT ACTIVITIES.  IN ADDITION, ANY ADDITIONAL FINANCING THAT
MAY BE AVAILABLE COULD RESULT IN DILUTION.

      Our existing  working capital will not be sufficient to meet our needs and
we may not be able to obtain adequate additional financing necessary to meet our
working capital  requirements.  We will need substantial  additional  funding to
conduct our research and product development  activities and, if approved by the
FDA or corresponding foreign regulatory  authorities,  to manufacture and market
the products  currently  under  development  and any other  products that we may
develop  in the  future.  We  intend  to seek to  raise  further  funds  through
collaborative  ventures  entered  into with  potential  corporate  partners  and
additional  debt or equity  financings.  We cannot provide  assurance that these
types of arrangements can be obtained.  We have not entered into arrangements to
obtain  any  additional   financing.   Any  additional  financing  could  be  on
unattractive terms or result in significant dilution of stockholders' interests.
If we fail  to  enter  into  collaborative  ventures  or to  receive  additional
funding, we would have to scale back or discontinue our research and development
operations. Furthermore, we could ultimately cease to qualify for listing of our
securities on the Nasdaq SmallCap  Market.  See "Possible  Delisting From Nasdaq
SmallCap Market;  Market Illiquidity." If additional financing is not available,
we will be required to modify our business  development plans or reduce or cease
certain or all of our operations.

IF WE FAIL TO OBTAIN REGULATORY APPROVAL TO COMMERCIALLY MANUFACTURE OR SELL ANY
OF OUR PRODUCTS OR IF APPROVAL IS DELAYED, IT COULD INCREASE THE COST OF PRODUCT
DEVELOPMENT OR ULTIMATELY  PREVENT OR DELAY OUR ABILITY TO SELL OUR PRODUCTS AND
GENERATE REVENUES.

      In order to sell our products that are under development,  we must receive
regulatory approvals for our products. The testing,  manufacture,  distribution,
advertising and marketing of drug products are subject to extensive and rigorous
regulation by governmental authorities in the United States and other countries.
Prior to marketing, any pharmaceutical products developed or licensed by us must
undergo an  extensive  regulatory  approval  process  required by the FDA and by
comparable agencies in other countries. This process, which includes preclinical
studies and clinical  trials of each  pharmaceutical  compound to establish  its
safety  and  effectiveness  and  confirmation  by the FDA that good  laboratory,
clinical  and  manufacturing   practices  were  maintained  during  testing  and
manufacturing,  is lengthy,  expensive and uncertain.  Clinical trials generally
take two to five years or more to complete.

      The testing and approval  processes require the expenditure of substantial
resources. We may not be able to obtain the requisite approvals for our products
on a timely basis,  if at all. Any required  approvals,  once  obtained,  may be
withdrawn.  Further,  if there is a later discovery of unknown problems or if we
fail to comply with other applicable regulatory requirements at any stage in the
regulatory  process,  we may be  restricted  or  delayed in the  marketing  of a
product,  forced to make product  recalls or seizures or may be subject to other
sanctions such as fines, injunctions,  civil penalties or criminal prosecutions.
For  marketing  outside  the United  States,  we also will be subject to foreign
regulatory  requirements  governing human clinical trials and marketing approval
for  pharmaceutical  products.  None of our products under  development has been
approved for marketing in the United  States or elsewhere.  If we fail to obtain
requisite  governmental  approvals  or fail to  obtain  approvals  of the  scope
requested of our business, we will be unable to market our products.

OUR STRATEGY IS TO ENTER INTO  COLLABORATIVE  AGREEMENTS WITH THIRD PARTIES WITH
RESPECT  TO OUR  PRODUCTS  AND  WE  HAVE  NOT  YET  ENTERED  INTO  ANY OF  THESE
AGREEMENTS. IN ADDITION, IF WE ENTER INTO THESE AGREEMENTS AND THE THIRD PARTIES
DO NOT PERFORM, IT COULD IMPAIR OUR ABILITY TO COMMERCIALIZE OUR PRODUCTS.

      Our strategy for the completion of the development and clinical testing of
our products and for the manufacturing,  marketing and  commercialization of our
products  depends  upon  the  formation  of  collaborative   arrangements   with
pharmaceutical companies. We have not yet entered into any of these arrangements
or  agreements  to date.  Our success will depend upon  obtaining  partners.  In
addition,  if we obtain  partners,  we will depend on their  expertise and their
dedication of sufficient  resources to develop and commercialize  certain of our
proposed products. We may in the future grant to our collaborative  partners, if
any, rights to license and commercialize pharmaceutical products developed under
these  collaborative  agreements.  Those rights would limit our  flexibility  in
considering  alternatives for the  commercialization of our products. If we fail
to successfully  develop these  relationships or if


864725.6

                                       3
<PAGE>

our collaborative partners fail to develop or commercialize  successfully any of
our products,  it may delay of prevent us from developing or commercializing our
products in a competitive and timely manner.

DISCOVERIES OR DEVELOPMENTS OF NEW TECHNOLOGIES BY OUR COMPETITORS OR OTHERS MAY
MAKE OUR PRODUCTS LESS COMPETITIVE OR MAKE OUR PRODUCTS OBSOLETE.

      The  market  for   biotechnology  is  characterized  by  rapidly  changing
technology and evolving industry  standards.  Our products under development are
intended to treat diseases for which other technologies and proposed  treatments
are rapidly  developing.  The results of our  research  and product  development
efforts may be rendered  obsolete by research  efforts of others,  including the
efforts and  activities of  governments,  major  research  facilities  and large
multinational corporations with greater research and development, manufacturing,
marketing, financial,  technological,  personal and managerial resources than we
have.

IF WE ARE  UNABLE TO  PROTECT  OUR  INTELLECTUAL  PROPERTY,  WE MAY BE UNABLE TO
PREVENT OTHER COMPANIES FROM USING OUR TECHNOLOGY IN COMPETITIVE PRODUCTS. IF WE
INFRINGE THE  INTELLECTUAL  PROPERTY RIGHTS OF OTHERS,  WE MAY BE PREVENTED FROM
DEVELOPING OR MARKETING OUR PRODUCTS.

     IF  WE  ARE  UNABLE  TO  OBTAIN  PATENTS  FOR  OUR  PRODUCTS  OTHERS  COULD
     COMMERCIALIZE EQUIVALENT PRODUCTS

      We seek patent  protection for our drug candidates so as to prevent others
from  commercializing  equivalent  products  in  substantially  less time and at
substantially  lower expense.  The pharmaceutical  industry places  considerable
importance on obtaining patent and trade secret protection for new technologies,
products and processes.  Our success will depend in part on our ability and that
of our licensors to:

      --    defend our patents and otherwise  prevent others from  infringing on
            our proprietary rights;

      --    protect trade secrets; and

      --    operate without  infringing  upon the proprietary  rights of others,
            both in the United States and in other countries.

      The  patent  position  of  firms  relying  upon  biotechnology  is  highly
uncertain and involves complex legal and factual  questions.  To date, there has
emerged no consistent  policy at the United  States Patent and Trademark  Office
regarding the breadth of claims allowed in  biotechnology  patents or the degree
of protection afforded under these types of patents.

      EVEN IF WE ARE ABLE TO OBTAIN  PATENTS  TO  PROTECT  OUR  PRODUCTS,  THOSE
      PATENTS MAY NOT BE BROAD ENOUGH TO KEEP OTHERS FROM COMPETING WITH US.

      Various  United  States  and  foreign  patents   applications   (including
international  applications filed under the Patent Cooperation Treaty) have been
filed with respect to the products and  technologies  under our  development and
patents have been issued with respect to our  products and  technologies.  These
patents and patent  applications  have been  licensed to us. Our pending  patent
applications, those we may file in the future or those we may license from third
parties may not result in patents being issued.  Also,  patent rights may not be
sufficiently  broad  enough  to  provide  us  with  proprietary   protection  or
competitive   advantages   against   competitors   with  similar   products  and
technologies. Furthermore, patents, if issued, may be challenged, invalidated or
circumvented.  Thus,  any patents we own or license  from third  parties may not
provide  any  protection  against  competitors.  In  particular,  our issued and
pending  patents  relating  to  SuperVent(TM)   cover  high   concentrations  of
tyloxapol.  These  patents could prove  meaningless  if it were to be determined
that low  concentrations of tyloxapol are as effective as higher  concentrations
of tyloxapol in treating the indications for which we are seeking to develop our
SuperVent(TM) product.

     OUR ABILITY TO MARKET OUR  PRODUCTS  MAY BE LIMITED BY PATENTS  OBTAINED BY
     OTHERS.

      Our  commercial  success  also  depends  significantly  on our  ability to
operate without  infringing the patents or violating the  proprietary  rights of
others.  A United States patent  application is maintained  under  conditions of
confidentiality  while the application is pending.  Accordingly,  we will not be
able to determine  which  inventions are

864725.6

                                       4
<PAGE>

claimed in pending patent applications filed by third parties. Litigation may be
necessary to defend or enforce our patent and license rights or to determine the
scope and validity of the proprietary rights of others.  Defense and enforcement
of patent  claims  can be  expensive  and  time-consuming.  Thus,  even in those
instances in which the outcome is favorable to us, these  proceedings can result
in the diversion of substantial resources from our other activities.  An adverse
determination  may subject us to  significant  liabilities or require us to seek
licenses  that may not be available  from third  parties.  We may be required to
alter our  products or processes or cease  altogether  any related  research and
development activities or product sales.

     IF WE CANNOT MEET REQUIREMENTS UNDER OUR LICENSE AGREEMENTS,  WE COULD LOSE
     OUR RIGHTS TO OUR PRODUCTS.

      We depend on  licensing  arrangements  to maintain  rights to our products
under development,  and we will be required to make certain payments and satisfy
certain   performance   obligations  in  order  to  maintain   those   licensing
arrangements.  Pursuant to our licensing agreements,  we are responsible for the
cost of filing  and  prosecuting  patent  applications  and  maintaining  issued
patents.  If we do not meet our  obligations  under our license  agreements in a
timely manner, we could lose the rights to our proprietary technology.

     WE RELY ON CONFIDENTIALITY AGREEMENTS THAT COULD BE BREACHED.

      We require all  employees to enter into  confidentiality  agreements  that
prohibit the disclosure of confidential information to third parties and require
disclosure and assignment to us of rights to our employees' ideas, developments,
discoveries  and inventions  while so employed.  In addition,  we seek to obtain
these  types  of  agreements  from  our   consultants,   advisors  and  research
collaborators.  To the extent that  consultants,  key  employees  or other third
parties apply technological  information  independently  developed by them or by
others to any of our proposed projects, disputes may arise as to the proprietary
rights to this type of  information  that may not be resolved  in our favor.  In
addition,  we will rely on trade secrets and  proprietary  know-how that we will
seek to  protect  in part by  confidentiality  agreements  with  its  employees,
consultants, advisors or others. We cannot assure you that:

      --    these agreements will not be breached;

      --    we would obtain adequate remedies for this type of breach;  or

      --    our trade secrets or proprietary  know-how will not otherwise become
            known or be independently developed by competitors.

IF THE THIRD  PARTIES  WE DEPEND ON FOR THE  MANUFACTURE  OF OUR  PHARMACEUTICAL
PRODUCTS DO NOT SUPPLY THESE PRODUCTS IN A TIMELY MANNER, IT MAY DELAY OR IMPAIR
OUR ABILITY TO DEVELOP AND MARKET OUR PRODUCTS.

      We will be required  to rely on outside  manufacturers,  including  Taylor
Pharmaceuticals, Inc., to produce appropriate clinical grade material that meets
standards for use in clinical  studies for certain of our products.  We may also
enter into arrangements with other manufacturers for the manufacture of material
for use in clinical testing.

      Our outside  manufacturers  may not perform as agreed or may not remain in
the contract  manufacturing business for the time required by us to successfully
produce and market our product candidates.  If one of our outside  manufacturers
fails to deliver the required  quantities of our product candidates for clinical
use on a timely basis and at commercially reasonable prices, and we fail to find
a replacement  manufacturer or develop our own  manufacturing  capabilities,  it
could  delay or  impair  our  ability  to  obtain  regulatory  approval  for our
products.

      In  addition,  our  third-party  manufacturers  are  required  to register
manufacturing  facilities with the FDA and foreign regulatory  authorities.  The
facilities will then be subject to inspections  confirming  compliance with good
manufacturing  practice  requirements  established with the FDA or corresponding
foreign  regulations.  If our  third-party  foreign  or  domestic  suppliers  or
manufacturers  of our products fail to comply with good  manufacturing  practice
requirements  or other FDA  regulatory  requirements,  our  products  may not be
marketable.

864725.6

                                       5
<PAGE>

WE DO NOT HAVE MARKETING AND SALES  EXPERIENCE,  AND OUR LACK OF THAT EXPERIENCE
COULD LIMIT OUR ABILITY TO GENERATE REVENUES FROM FUTURE PRODUCT SALES.

      We do not have  marketing  and  sales  experience  or  marketing  or sales
personnel.  If we do not develop a marketing  and sales  force,  then we will be
dependent  on  entering  into  arrangements  with  corporate  partners  or other
entities for the marketing and sale of our products. We may not be successful in
entering into any  satisfactory  third-party  arrangements for the marketing and
sale of our products. In addition, we may not successfully develop marketing and
sales experience and personnel or we may not have sufficient resources to do so.
If we fail to establish  successful  marketing and sales capabilities or fail to
enter into  successful  distribution,  marketing and selling  arrangements  with
third parties for our anticipated  products,  our business,  financial condition
and results of operations will be materially adversely affected.

WE DEPEND UPON KEY EMPLOYEES AND CONSULTANTS IN A COMPETITIVE MARKET FOR SKILLED
PERSONNEL.  IF WE ARE  UNABLE TO  ATTRACT  AND  RETAIN  KEY  PERSONAL,  IT COULD
ADVERSELY EFFECT OUR ABILITY TO DEVELOP AND MARKET OUR PRODUCTS.

      We are highly dependent upon the principal members of our management team,
especially Dr. Capetola,  and our directors,  as well as our scientific advisory
board members,  consultants and collaborating  scientists. We have an employment
agreement  with  Dr.  Capetola  which  expires  on June  15,  2002. We also have
employment  agreements with other key personnel with termination  dates expiring
in 2001.  We do not maintain key main life  insurance.  The loss of any of these
persons'  services would adversely  affect our ability to develop and market our
products and obtain necessary regulatory approvals.

      Our future  success also will depend in part on the  continued  service of
our key scientific and  management  personnel and our ability to identify,  hire
and  retain  additional  personnel,  including  marketing  and sales  staff.  We
experience intense competition for qualified personnel.

      While we attempt to provide competitive  compensation  packages to attract
and retain key  personnel,  some of our  competitors  are likely to have greater
resources  and be more  established  than we are,  making it difficult for us to
compete for key personnel.

WE ARE IN AN  INDUSTRY  CHARACTERIZED  BY INTENSE  COMPETITION  AND WE HAVE LESS
CAPITAL AND RESOURCES  THAN MANY OF OUR  COMPETITORS,  AND THIS MAY GIVE THEM AN
ADVANTAGE IN DEVELOPING AND MARKETING PRODUCTS SIMILAR TO OURS.

      We are engaged in a highly competitive industry. Competition from numerous
existing  companies  and  potential  new  entities  is intense  and  expected to
increase.  Many of these  companies  have  substantially  greater  research  and
development,  marketing,  financial,  technological,  personnel  and  managerial
resources than we have. In addition, many of these competitors,  either alone or
with their collaborative partners, have significantly greater experience than we
do in:

      --  developing products;

      --  undertaking preclinical testing and human clinical trials;

      --  obtaining FDA and other regulatory approvals or products; and

      --  manufacturing and marketing products.

      Accordingly,  our competitors may succeed in obtaining patent  protection,
receiving  FDA approval or  commercializing  products  before us. If we commence
commercial  product sales, we will be competing  against  companies with greater
marketing  and  manufacturing  capabilities,  areas in  which,  as yet,  we have
limited or no experience.  In addition,  developments  by competitors may render
our product candidates  obsolete or competitive.  Our competitors may succeed in
developing and marketing products that are more effective than ours.

      We also  face,  and will  continue  to face,  competition  from  colleges,
universities,  governmental  agencies  and other  public  and  private  research
organizations.  These  competitors  are becoming  more active in seeking  patent
protection

864725.6

                                       6
<PAGE>

and licensing  arrangements to collect royalties for use of technology that they
have developed,  some of which may be directly competitive with the technologies
to be  developed  by  us.  These  institutions  will  also  compete  with  us in
recruiting  highly  qualified   scientific   personnel.   It  is  expected  that
therapeutic  developments in the areas in which we will be active may occur at a
rapid rate and that  competition  will  intensify  as advances in this field are
made.  Accordingly,  we will be  required  to  continue  to  devote  substantial
resources and efforts to research and development activities.

IF WE BECOME  SUBJECT  TO  PRODUCT  LIABILITY  CLAIMS,  IT MAY RESULT IN REDUCED
DEMAND FOR OUR PRODUCTS OR DAMAGES THAT EXCEED OUR INSURANCE COVERAGE.

      If we  successfully  develop any  products,  the  marketing and use of our
products, through third-party arrangements or otherwise,  whether for commercial
applications or during clinical trials,  exposes us to product  liability claims
in the event that the use or misuse of those products causes injury,  disease or
results in adverse  effects.  We presently  carry  product  liability  insurance
relating to our clinical  trials of  SuperVent(TM)  and our  clinical  trials of
Surfaxin(R)  in treating  acute  respiratory  distress  syndrome  and acute lung
injury and Meconium aspiration syndrome.  However, this insurance coverage might
not be  sufficient to fully cover any  potential  claims.  We may be required to
obtain additional  product liability  insurance  coverage prior to initiation of
other clinical trials. We expect to obtain product liability  insurance coverage
before  commercialization of our proposed products;  however, this insurance can
be expensive and difficult to obtain.  We cannot provide assurance that adequate
insurance will be available in the future at an acceptable  cost, if at all. Any
product  liability  claim,  even  one that was not in  excess  of our  insurance
coverage or one that was  ultimately  determined to be  meritless,  could have a
material  adverse  effect on our  business,  financial  condition and results of
operations.

HEALTHCARE  REFORM  MEASURES AND  REIMBURSEMENT  PROCEDURES  MAY PREVENT US FROM
OBTAINING AN ADEQUATE LEVEL OF REIMBURSEMENT FOR OUR PRODUCTS THAT IN TURN WOULD
DECREASE OUR ABILITY TO GENERATE REVENUES.

      The  levels  of  revenues  and  profitability  of  pharmaceutical   and/or
biotechnology  products and companies may be affected by efforts of governmental
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 a number of federal and state  proposals  to  implement
similar  government  control.  Pricing  constraints on our products could have a
material adverse effect on our business.

      In the United States and elsewhere,  successful  commercialization  of our
products  will  depend  in  part on the  availability  of  reimbursement  to the
consumer  using  our  products  from  third-party  health  care  payers  such as
government and private insurance plans.  Adequate third-party  reimbursement may
not be available to enable us to maintain price levels  sufficient to realize an
appropriate return on our investment in product development. Third- party health
care  payers  are   increasingly   challenging   the  price  and  examining  the
cost-effectiveness  of medical products and services.  If we succeed in bringing
one or more products to market, and the government or third-party payers fail to
provide adequate coverage or reimbursement rates for those products,  we may not
be able to sell our products on a competitive  basis. If we are not able to sell
our products on a  competitive  basis,  our  business,  financial  condition and
results of operations will be materially adversely affected.

DIRECTORS,  EXECUTIVE OFFICERS,  PRINCIPAL  STOCKHOLDERS AND AFFILIATED ENTITIES
OWN A SIGNIFICANT PERCENTAGE OF OUR CAPITAL STOCK, AND THIS COULD HAVE AN EFFECT
ON CERTAIN DECISIONS.

      As of August  13,  1999,  our  directors,  executive  officers,  principal
stockholders  and  affiliated  entities  beneficially  own,  in  the  aggregate,
approximately 34% of our outstanding voting securities,  assuming  conversion of
convertible  securities.  Accordingly,  these  stockholders  have the ability to
exert substantial  influence over the election of our Board of Directors and the
outcome of issues requiring  approval by our stockholders.  Such a concentration
of ownership  may have the effect of delaying or preventing a change in control,
including  transactions in which  stockholders might otherwise recover a premium
for their shares over their current market prices.

864725.6

                                       7
<PAGE>

WE FACE THE POSSIBILITY OF BEING DELISTED FROM THE NASDAQ SMALLCAP MARKET.

      To meet the current  Nasdaq  listing  requirements  for our  securities to
continue to be listed on the Nasdaq  SmallCap  Market,  we will have to maintain
(a) (1) at least $2 million in net  tangible  assets,  (2) $35 million in market
capitalization or (3) $500,000 in net income (over two of the last three years),
(b) a public float of at least  500,000  shares valued at $1 million or more and
(c) a minimum  bid price of $1. In  addition,  our common  stock will have to be
held by at least 300  holders  and will have to have at least two active  market
makers.   For  purposes  of  determining   compliance   with  the  public  float
requirement,  shares of stock  held by  officers,  directors  and 10% or greater
stockholders  are excluded.  At June 30, 1999, we had $2,090,000 in net tangible
assets. In addition,  we received net proceeds of approximately $2.45 million in
a private  placement  completed  in July 1999.  The closing  price of our common
stock during the period from  January 1, 1999 to September  27, 1999 ranged from
$1.00 to $4.00 and the Closing  Price of our common stock on September  27, 1999
was $1.44. We will need to raise additional capital in order to continue to meet
the listing requirements.

      If we are unable to satisfy the NASD's listing  maintenance  requirements,
our securities may be delisted from the Nasdaq SmallCap Market.  In this type of
event,  trading,  if any, in our securities would thereafter be conducted in the
over-the-counter  market in the Pink Sheets(R),  a quotation  medium operated by
the National  Quotation  Bureau,  LLC, or on the NASD's OTC  Bulletin  Board(R).
Consequently, the liquidity of our securities could be impaired, not only in the
number of securities  that could be bought and sold,  but also through delays in
the timing of the transactions,  reduction in securities  analysts' and the news
media's  coverage of us and lower prices for our securities than might otherwise
be attained.

THE "PENNY STOCK" RULES MAY ADVERSELY AFFECT THE LIQUIDITY FOR OUR COMMON STOCK.

      If our  securities  were to be delisted from the Nasdaq  SmallCap  Market,
they could become  subject to Rule 15g-9 under the Exchange  Act,  which imposes
additional sales practice  requirements on broker-dealers  that sell these types
securities  to  persons  other  than   established   customers  and  "accredited
investors"  (generally,  individuals  with net worth in excess of  $1,000,000 or
annual incomes exceeding $200,000, or $300,000 together with their spouses). For
transactions  covered  by  this  rule,  a  broker-dealer  must  make  a  special
suitability  determination  for the purchaser and have received the  purchaser's
written consent to the  transaction  prior to sale.  Consequently,  the rule may
adversely  affect the ability of  broker-dealers  to sell our securities and may
adversely  affect the  ability  of  stockholders  to sell any of the  securities
acquired hereby in the secondary market.

      The Commission has adopted  regulations  that define a "penny stock" to be
an equity security that has a market price (as therein  defined) less than $5.00
per share or with an  exercise  price of less than $5.00 per  share,  subject to
certain exceptions.  For any transaction involving a penny stock, unless exempt,
the rules require  delivery,  prior to any  transaction  in a penny stock,  of a
disclosure  schedule  prepared  by the  Commission  relating  to the penny stock
market. Disclosure is also required to be made about commissions payable to both
the broker-dealer and the registered  representative  and current quotations for
the securities.  Finally,  monthly statements are required to be sent disclosing
recent price information for the penny stock held in the account and information
on the limited market in penny stocks.

      These  restrictions  will not apply to our  securities  if our  securities
continue to be listed on the Nasdaq  SmallCap  Market and have certain price and
volume  information  provided on a current and continuing  basis or meet certain
minimum net tangible assets or average revenue criteria.  Our securities may not
qualify  for  exemption  from  these  restrictions.  In any  event,  even if our
securities  continue  to be exempt  from  these  restrictions,  we would  remain
subject to Section  15(b)(6) of the Exchange Act, which gives the Commission the
authority  to  prohibit  any person who is engaged  in  unlawful  conduct  while
participating  in a  distribution  of a  penny  stock  from  associating  with a
broker-dealer  or  participating  in a  distribution  of a penny  stock,  if the
Commission finds that these restrictions  would be in the public  interest.  If
our  securities  were subject to the existing or proposed rules on penny stocks,
the market liquidity for our securities could be severely adversely affected.

864725.6

                                       8
<PAGE>

A  SUBSTANTIAL  NUMBER OF OUR  SECURITIES  ARE ELIGIBLE FOR FUTURE SALE AND THIS
COULD AFFECT THE MARKET PRICE FOR OUR STOCK AND OUR ABILITY TO RAISE CAPITAL.

      The market  price of our common  stock  could drop due to sales of a large
number of shares of our common  stock or the  perception  that these sales could
occur. As of August 10, 1999, in addition to  approximately  9,064,881 shares of
common stock,  we could be required to issue up to  10,951,289  shares of Common
Stock if  outstanding  options,  warrant and preferred  stock are converted into
Common  Stock.  In  addition,  shares  of  Series  C  preferred  stock  would be
convertible  into  approximately  1,775,821  shares of common stock based on the
market price of the common stock as of June 1, 1999.

      Our stock options and warrants are likely to be exercised, if at all, at a
time when we otherwise  could obtain a price for the sale of our securities that
is higher than the exercise price per security of the options or warrants.  This
exercise or the  possibility  of this  exercise may impede our efforts to obtain
additional  financing  through the sale of  additional  securities  or make this
financing more costly.

      No prediction can be made as to the effect,  if any, that the availability
of these  shares  for sale will have on the market  price of our  common  stock.
Nevertheless, because substantial amounts of our common stock may be sold in the
public market,  subject,  in some cases,  to compliance  with Rule 144 under the
Securities  Act,  the market price of our common stock could drop as a result of
sales of these securities or the perception that these types of sales may occur.
These  factors  could also make it more  difficult for us to raise funds through
future offerings of securities.

WE ARE SUBJECT TO ANTITAKEOVER  PROVISIONS OF OUR  CERTIFICATE OF  INCORPORATION
AND DELAWARE LAW.

      Certain  provisions of our Certificate of  Incorporation  and Delaware law
may discourage  transactions  involving actual or potential  changes in control.
Our  Certificate of  Incorporation  allows us to issue shares of preferred stock
without any vote or further action by our  shareholders.  Our Board of Directors
has the authority to fix and determine the relative  rights and  preferences  of
preferred  shares,  as well as the  authority  to issue  these  shares,  without
further  stockholder  approval.  As a  result,  our  Board  of  Directors  could
authorize  the  issuance  of a series of  preferred  stock that  would  grant to
holders the preferred right to our assets upon liquidation, the right to receive
dividend  coupons before  dividends would be declared to holders of common stock
and the right to the redemption of these shares,  together with a premium, prior
to the  redemption  of our common  stock.  In addition,  our Board of Directors,
without  further  stockholder  approval,  could issue large  blocks of preferred
stock to fend against unwanted tender offers or hostile takeovers.

      We are subject to certain  provisions  of Delaware law that could delay or
make more  difficult a merger,  tender offer or proxy  contest  involving us. In
particular,  we are subject to Section 203 of the Delaware  General  Corporation
Law  that  prohibits  a  Delaware  corporation  from  engaging  in any  business
combination  with any interested  stockholder for a period of three years unless
certain  conditions  are met.  In general,  Section  203  defines an  interested
stockholder  as any  entity or  person  beneficially  owning  15% or more of the
outstanding  voting stock of the corporation and any entity or person affiliated
with or controlling or controlled by this type of entity or person. The possible
issuance  of  preferred  stock  and  Delaware  law  could  have  the  effect  of
discouraging  others  from making  tender  offers for our  securities  and, as a
consequence,  they also may  inhibit  fluctuations  in the  market  price of our
common  stock that  otherwise  could  result  from  actual or  rumored  takeover
attempts. Those provisions also may have the effect of preventing changes in our
management.

OUR BUSINESS COULD BE AFFECTED BY THE YEAR 2000 ISSUE.

      The Year 2000 Issue is the result of computer programs being written using
two digits rather than four to define the applicable year. Any computer programs
or hardware that have date-sensitive  software or embedded chips may recognize a
date using "00" as the year 1900 rather than the year 2000.

      In terms of our internal operations, we do not use equipment with embedded
chip  technology  that is date  sensitive.  We  expect  that the  systems  to be
affected  by the Year 2000 date  change  include the  database,  networking  and
accounting  software  licensed  by us. We expect  to incur  out-of-pocket  costs
related to making inquiries of, and receiving  confirmations from, third parties
of no more than $10,000.

864725.6

                                       9
<PAGE>

      If our computer  systems or the computer  systems of any of our suppliers,
customers or other third parties are not Year 2000 compliant or if those systems
are unable to recover  from system  interruptions  that may result from the Year
2000 date change, our business could be materially adversely affected.


      FORWARD-LOOKING STATEMENTS

      This prospectus may contain forward-looking  statements within the meaning
of Section 27A of the  Securities  Act of 1933 and Section 21E of the Securities
Exchange  Act of 1934.  Forward-looking  statements  are  subject  to risks  and
uncertainties.  Those  risks and  uncertainties  may cause our  actual  results,
performance or achievements to be materially different from what is expressed or
implied by the forward-looking statements.  Forward-looking statements are based
on  assumptions  and describe our future  plans,  strategies  and  expectations.
Forward-looking statements are generally identifiable by use of the words "may,"
"will," "should,"  "expect,"  "anticipate,"  "estimate,"  "believe," "intend" or
"project" or comparable terminology.

864725.6


                                       10
<PAGE>




                                 USE OF PROCEEDS

      We will not receive  any  proceeds  from the sales of common  stock by the
selling stockholders pursuant to this prospectus.


                              SELLING STOCKHOLDERS

      The  following  table sets forth certain  information  with respect to the
amount of common stock held by each selling  stockholder  as of the date of this
prospectus and the shares being offered by the selling  stockholders.  The table
indicates the nature of any position, office or other material relationship that
the  selling  stockholder  has had within the past  three  years with  Discovery
Laboratories or any of its predecessors or affiliates.  This prospectus  relates
to the offer and sale of the selling  stockholders of up to 7,192,870  shares of
common  stock,  including  2,759,189  shares of common stock  issuable  upon the
exercise of outstanding warrants issued by Discovery  Laboratories.  The selling
stockholders may offer all or part of the shares of common stock covered by this
prospectus.  Information  with  respect to shares owned  beneficially  after the
offering assumes the sale of all of the shares offered and no other purchases or
sales of common  stock.  The  common  stock  offered by this  prospectus  may be
offered from time to time by the selling stockholders named below.

<TABLE>
<CAPTION>


                               Number of                        Total
                            Shares of Common      Number       Number of                       Number of                  Percentage
                              Stock, not        of Shares      Shares of         Percentage   Shares to be     Number of    to be
                               including       Represented     Common          Beneficially  Offered for     Shares to  Beneficially
                               Warrants,       by Warrants      Stock             Owned      the Account      be Owned     Owned
                             Beneficially      Beneficially    Beneficially       Before     of the Selling   after this  after this
Name                            Owned             Owned          Owned  +         Offering    Stockholder      Offering    Offering
- ---------------            ---------------   -------------   --------------   -------------   -------------- --------- -----------
<S>                               <C>             <C>              <C>              <C>       <C>                 <C>     <C>
Moonlight International,
  Ltd...........................  165,289         165,289          330,578          4.9%      330,578             0       *
Dr. Tis Prager..................   41,322          41,322           82,644          1.2%       82,644             0       *
Keys Foundation.................  165,289         165,289          330,578          4.9%      330,578             0       *
Finsbury Worldwide
Pharmaceutical Trust............  826,446         826,446        1,652,892         20.0%    1,652,892             0       *
Caduceus Capital II, L.P........  165,289         165,289          330,578          4.9%      330,578             0       *
Winchester Global Trust
Company Ltd.....................  661,157         661,157        1,322,314         16.7%    1,322,314             0       *
Windward Venture Partners          83,645          56,903          139,548          2.0%      139,548             0       *
Benjamin Bollag.................   61,693          42,677          104,370          1.5%      104,370             0       *
Michael Bollag..................   61,693          42,677          104,370          1.5%      104,370             0       *
Concordia Partners L.P..........  310,954          56,903          367,857          4.6%      139,548       175,117     2.6%
Aries Domestic Fund, L.P........  385,576         117,529          503,105          7.4%      230,253       272,852     4.1%
The Aries Master Fund             907,012         274,237        1,181,249         17.0%      537,258       643,991     9.7%
126736 Canada, Inc..............  378,358          28,451           69,773          1.0%       69,773             0     3.4%
CPC Offshore Equity
Fund I LTD......................   41,322               0           69,773          1.0%       69,773             0       *
Johnson & Johnson Inc...........  205,846               0          205,846          3.0%      205,846             0       *
Paramount Capital Inc...........        0         404,958          404,958          5.0%      404,958             0       *
Brobeck, Phleger & Harrison LLP    14,000               0           14,000          0.21%       14,000            0       *
Yi, Tuan & Brunstein............    4,850               0            4,850          0.07%        4,850            0       *
Scripps Research Institute......  117,500               0          117,000           1.7%      117,000            0       *
RAQ, LLC                        1,001,739               0        1,001,739          15.2%    1,001,739            0       *
- ---------------
</TABLE>

*    Less than 1%.

+    The information contained in this table reflects "beneficial"  ownership of
     common stock  within the meaning of Rule 13d-3 under the  Exchange  Act. On
     August 13, 1999,  Discovery  Laboratories  had  9,064,889  shares of common
     stock outstanding.  Beneficial ownership information reflected in the table
     includes shares  issuable upon the exercise of outstanding  warrants issued
     by Discovery Laboratories.

864725.6

                                       11
<PAGE>



                              PLAN OF DISTRIBUTION

      The shares of common  stock  covered by this  prospectus  are owned by the
selling stockholders. As used in the rest of this section of the prospectus, the
term "selling  stockholders"  includes the named selling stockholders and any of
their  pledgees,  donees,  transferees or other  successors in interest  selling
shares  received  from a  named  selling  stockholder  after  the  date  of this
prospectus. The selling stockholders may offer and sell, from time to time, some
or all of the  shares.  We have  registered  the shares for sale by the  selling
stockholders so that the shares will be freely  tradeable by them.  Registration
of the  shares  does not mean,  however,  that the  shares  necessarily  will be
offered or sold.  We will not receive any proceeds  from any offering or sale by
the selling stockholders of the shares. We will pay all costs, expenses and fees
in connection with the registration of the shares. The selling stockholders will
pay all brokerage commissions and similar selling expenses, if any, attributable
to the sale of the shares.

      The selling  stockholders will act independently of us in making decisions
with respect to the timing, manner and size of each sale. The shares may be sold
by or for  the  account  of the  selling  stockholders  from  time  to  time  in
transactions on the Nasdaq SmallCap  Market,  the  over-the-counter  market,  or
otherwise.  These sales may be at fixed prices or prices that may be changed, at
market  prices  prevailing  at the  time of sale,  at  prices  related  to these
prevailing  market  prices or at  negotiated  prices.  The shares may be sold by
means of one or more of the following methods:

       --   in a block  trade in which a  broker-dealer  will  attempt to sell a
            block of shares as agent but may  position  and  resell a portion of
            the block as principal to facilitate the transaction;

       --   purchases  by a  broker-dealer  as  principal  and  resale  by  that
            broker-dealer for its account pursuant to this prospectus;

       --   on  markets  where our  common  stock is  traded  or in an  exchange
            distribution in accordance with the rules of the exchange;

       --   through broker-dealers, that may act as agents or principals;

       --   directly to one or more purchasers;

       --   through agents;

       --   in connection with the loan or pledge of shares to a  broker-dealer,
            and the sale of the  Shares so  loaned or the sale of the  Shares so
            pledged upon a default;

       --   in  connection  with  put or  call  option  transactions,  in  hedge
            transactions,   and  in   settlement   of  other   transactions   in
            standardized or over-the-counter options;

       --   through  short  sales of the Shares by the selling  stockholders  or
            counterparties to those  transactions,  in privately  negotiated
            transactions; or

       --   in any combination of the above. In addition, any of the shares that
            qualify for sale pursuant to Rule 144 under the  Securities  Act may
            be sold under Rule 144 rather than pursuant to this prospectus.

       In  effecting   sales,   brokers  or  dealers   engaged  by  the  selling
stockholders  may  arrange  for other  brokers or dealers  to  participate.  The
broker-dealer transactions may include:

       --   purchases of the shares by a broker-dealer  as principal and resales
            of the shares by the  broker-dealer for its account pursuant to this
            prospectus;

       --   ordinary brokerage transactions; or

       --   transactions in which the broker-dealer solicits purchasers.

864725.6

                                       12
<PAGE>

       If a  material  arrangement  with any  broker-dealer  or  other  agent is
entered into for the sale of any Shares through a block trade, special offering,
exchange  distribution,  secondary  distribution,  or a purchase  by a broker or
dealer,  a prospectus  supplement will be filed, if necessary,  pursuant to Rule
424(b) under the  Securities Act disclosing the material terms and conditions of
these arrangement.

       The selling  stockholders and any broker-dealers or agents  participating
in the distribution of the shares may be deemed to be "underwriters"  within the
meaning of the  Securities  Act, and any profit on the sale of the Shares by the
selling  stockholders and any commissions received by a broker-dealer or agents,
acting in this capacity, may be deemed to be underwriting  commissions under the
Securities  Act. The selling  stockholders  may agree to indemnify  any agent or
broker-dealer  that  participates in transactions  involving sales of the Shares
against certain liabilities,  including liabilities arising under the Securities
Act.

       The selling  stockholders are not restricted as to the price or prices at
which  they may sell  their  shares.  Sales of such  shares  may have an adverse
effect  on  the  market  price  of  the  common  stock.  Moreover,  the  selling
stockholders  are not  restricted as to the number of shares that may be sold at
any time,  and it is possible that a significant  number of shares could be sold
at the same time,  which may have an adverse  effect on the market  price of the
common stock.


                       WHERE YOU CAN FIND MORE INFORMATION

       We file annual, quarterly and special reports, proxy statements and other
information with the Securities and Exchange  Commission.  You may read and copy
any  document  we  file  at the  Securities  and  Exchange  Commission's  public
reference rooms at 450 Fifth Street, N.W., Washington, D.C. 20549, 7 World Trade
Center,  13th Floor,  New York, New York 10048,  and Citicorp  Center,  500 West
Madison  Street,  Suite  1400,  Chicago,  Illinois  60661-2511.  Please call the
Securities and Exchange  Commission at 1-800-SEC-0330 for further information on
the public reference rooms. Our Securities and Exchange  Commission  filings are
also  available  to the public from the  Securities  and  Exchange  Commission's
Website at "http://www.sec.gov."

       We have filed with the Securities and Exchange  Commission a registration
statement  (which contains this prospectus) on Form S-3 under the Securities Act
of 1933. The registration  statement  relates to the common stock offered by the
selling  stockholders.  This  prospectus does not contain all of the information
set forth in the  registration  statement  and the exhibits and schedules to the
registration  statement.  Please  refer to the  registration  statement  and its
exhibits and schedules for further information with respect to us and the common
stock.  Statements  contained  in  this  prospectus  as to the  contents  of any
contract or other document are not  necessarily  complete and, in each instance,
we refer you to the copy of that contract or document filed as an exhibit to the
registration  statement.  You may  read and  obtain  a copy of the  registration
statement and its exhibits and schedules  from the  Commission,  as described in
the preceding paragraph.


                      INFORMATION INCORPORATED BY REFERENCE

       The  Securities  and Exchange  Commission  allows us to  "incorporate  by
reference" the  information 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,  and information that we file later with the Securities and Exchange
Commission  will  automatically  update  and  supersede  this  information.   We
incorporate by reference the documents listed below and any filings we make with
the Securities and Exchange  Commission  after the date of this prospectus under
Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934:

       1.   Our Annual  Report on Form  10-KSB and  10-KSB/A  for the year ended
            December 31, 1998;

       2.   Our  Quarterly  Reports on Form  10-Q-SB and Form  10-QSB/A  for the
            quarter ended March 31, 1999;

       3.   Our  Quarterly  Report on Form 10Q-SB for the quarter ended June 30,
            1999;

       4.   The  description  of our capital stock  contained in our Form 8-A as
            filed with the Securities and Exchange  Commission on July 13, 1995;
            and

864725.6


                                       13
<PAGE>

       5.  Our current  report on Form 8-K as filed with the  Securities
           and Exchange Commission on August 9, 1999.

       You may  request  a copy of these  filings,  at no cost,  by  writing  or
telephoning us at the following address: Discovery Laboratories, Inc., 305 South
Main Street, Doylestown, Pennsylvania 18901, Attention: Cynthia Davis. Telephone
requests may be directed to (215)  340-4699.  Exhibits to the documents will not
be sent,  unless those exhibits have specifically been incorporated by reference
in this prospectus.

       This  prospectus  is part of a  registration  statement we filed with the
Securities  and  Exchange  Commission.  You should rely only on the  information
contained  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 is accurate as of any date other than the date on
the front of the document.


                                     EXPERTS

       The  consolidated  financial  statements of Discovery  Laboratories as of
December  31, 1998 and each of the years in the two-year  period ended  December
31, 1998 and the period from May 18, 1993 (inception)  through December 31, 1998
incorporated  by reference in this  registration  statement have been audited by
Richard A. Eisner & Company,  LLP ("RAE"),  independent  auditors,  as stated in
their  reports  appearing  therein.  These  financial  statements  have  been so
included in reliance on the reports of RAE given on their  authority  as experts
in accounting and auditing.


                                  LEGAL MATTERS

       The validity of the shares of common stock offered hereby has been passed
upon for us by Battle Fowler LLP, New York, New York.




864725.6

                                       14
<PAGE>




WE HAVE NOT  AUTHORIZED  ANYONE TO PROVIDE YOU WITH  INFORMATION OR TO REPRESENT
ANYTHING NOT CONTAINED IN THIS PROSPECTUS. YOU MUST NOT RELY ON ANY UNAUTHORIZED
INFORMATION OR REPRESENTATIONS.  THE SELLING  STOCKHOLDERS ARE OFFERING TO SELL,
AND SEEKING  OFFERS TO BUY,  ONLY THE SHARES OF  DISCOVERY  LABORATORIES  COMMON
STOCK  COVERED  BY  THIS  PROSPECTUS,   AND  ONLY  UNDER  CIRCUMSTANCES  AND  IN
JURISDICTIONS  WHERE IT IS LAWFUL TO DO SO. THE  INFORMATION  CONTAINED  IN THIS
PROSPECTUS IS CURRENT ONLY AS OF ITS DATE, REGARDLESS OF THE TIME OF DELIVERY OF
THIS PROSPECTUS OR OF ANY SALE OF THE SHARES.


                                7,192,870 SHARES




                          DISCOVERY LABORATORIES, INC.


                                  COMMON STOCK


                               SEPTEMBER __, 1999


864725.6

                                       15
<PAGE>

                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.   Other Expenses of Issuance and Distribution

       The  following  table  sets  forth the  various  expenses  payable by the
Registrant in connection with the sale and  distribution of the securities being
registered  hereby.  Normal  commission  expenses and brokerage fees are payable
individually by the selling  stockholders.  All amounts are estimated except the
Commission registration fee.


                                                                      Amount
                                                                      ------
                SEC registration fee........................          $1,769
                Accounting fees and expenses................           4,500
                Legal fees and expenses.....................          22,000
                Miscellaneous fees and expenses.............           1,731
                                                             -----------------
                           Total............................         $30,000
                                                             =================

Item 15.  Indemnification of Directors and Officers

       Section 145 of the Delaware  General  Corporation law empowers a Delaware
corporation  to  indemnify  any persons who are, or are  threatened  to be made,
parties  to  any  threatened,   pending  or  completed  legal  action,  suit  or
proceedings,  whether civil,  criminal,  administrative or investigative  (other
than action by or in the right of such corporation),  by reason of the fact that
such person was an officer or director of such corporation, or is or was serving
at the request of such corporation as a director,  officer, employee or agent of
another corporation or enterprise. The indemnity may include expenses (including
attorneys' fees),  judgments,  fines and amounts paid in settlement actually and
reasonably  incurred  by such person in  connection  with such  action,  suit or
proceeding,  provided that such officer or director acted in good faith and in a
manner he reasonably  believed to be in or not opposed to the corporation's best
interests and, for criminal proceedings,  had no reasonable cause to believe his
conduct was illegal. A Delaware corporation may indemnify officers and directors
in an action by or in the right of the  corporation  under the same  conditions,
except that no  indemnification  is permitted  without judicial  approval if the
officer  or  director  is  adjudged  to be  liable  to  the  corporation  in the
performance  of his duty.  Where an officer or  director  is  successful  on the
merits or  otherwise  in the  defense  of any  action  referred  to  above,  the
corporation  must  indemnify  him against  the  expenses  which such  officer or
director actually and reasonably incurred.

       In   accordance   with  Delaware   law,  our  restated   certificate   of
incorporation  contains  a  provision  to limit the  personal  liability  of our
directors for violations of their  fiduciary duty as a director.  This provision
eliminates  each  director's  liability to us or our  stockholders  for monetary
damages  except (i) for any breach of each  director's  duty of loyalty to us or
our  stockholders,  (ii) for acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (iii) under Section 174 of
the Delaware  General  Corporation  law providing for liability of directors for
unlawful payment of dividends or unlawful stock purchases or redemptions or (iv)
for any transaction from which a director derived an improper  personal benefit.
The effect of this provision is to eliminate the personal liability of directors
for monetary  damages for actions  involving a breach of their fiduciary duty of
care, including any such actions involving gross negligence.


864725.6

<PAGE>




Item 16.  Exhibits

EXHIBIT NO.                    DESCRIPTION
- -----------                    -----------

2.1*       Agreement and Plan of Merger dated as of March 5, 1998 among
           Discovery, ATI Acquisition Corp. and ATI.

2.2**      Agreement and Plan of Reorganization and Merger, dated as of July
           16, 1997, by and between Discovery and Old Discovery.

5.1+       Opinion of Battle Fowler LLP regarding the legality of the
           securities being registered.

16.1***    Letter  dated  January  28,  1998  from  Ernst & Young LLP to the
           Securities and Exchange Commission.

23.1+      Consent of Richard A. Eisner & Company, LLP.

24.1+      Powers of Attorney.

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

*    Incorporated  by reference to Discovery's  Annual Report on Form 10-KSB for
     the year ending December 31, 1997.

**   Incorporated by reference to Discovery's Registration Statement on Form S-4
     (File No. 333-34337).

***  Incorporated by reference to Discovery's Current Report on Form 8-K/A dated
     January 16, 1998.

+ Previously Filed.

Item 17.  Undertakings

       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 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 that 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  of 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:

     (1)   To file, during any period in which offers or sales are being made, a
           post-effective amendment to the Registrant 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)  that  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;

864725.6

                                      II-2

<PAGE>


provided,  however, that paragraphs (i) and (ii) do not apply if the information
required to be included in a  post-effective  amendment by those  paragraphs  is
contained in periodic reports filed by the Registrant  pursuant to Section 13 or
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.

    (4)    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 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.

864725.6

                                      II-3

<PAGE>



                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this amendment to its Registration Statement to be signed on its
behalf by the  undersigned,  thereunto duly  authorized in the City of New York,
New York, on the 28th day of September, 1999.


                                     DISCOVERY LABORATORIES, INC.
                                     (Registrant)


                                     By: /s/ Robert Capetola, PH.D
                                         -------------------------------
                                         Robert J. Capetola, Ph.D.
                                         Chief Executive Officer

           Pursuant to the  requirements  of the  Securities  Act of 1933,  this
amendment  to this  Registration  Statement  has been  signed  by the  following
persons in the capacities indicated on the dates indicated.

<TABLE>
<CAPTION>

        Signature                                                 Title                                   Date
        ---------                                                 -----                                   ------------------
<S>                                                               <C>                                     <C>
/s/  Robert J. Capetola, Ph.D.
- ------------------------------------------                         Chief Executive Officer                September 30, 1999
     Robert J. Capetola, Ph.D.

                   *
- ------------------------------------------                         Vice President, Finance                September 30, 1999
     Evan Myrianthopoulos

                   *
- ------------------------------------------                                Controller                      September 30, 1999
     Cynthia Davis                                                (Principal Accounting Officer)

                   *
- -------------------------------------------                          Chairman of the Board                September 30, 1999
     Steve H. Kanzer, C.P.A., Esq.

                   *
- -------------------------------------------                           Director                            September 30, 1999
     Richard Power

                   *
- -------------------------------------------                           Director                            September 30, 1999
     Marvin Rosenthale


- -------------------------------------------                           Director                            September 30, 1999
     Mark C. Rogers, M.D.

                   *
- -------------------------------------------                           Director                            September 30, 1999
     Herbert McDade, Jr.


- -------------------------------------------                           Director                            September 30, 1999
     Max Link, Ph.D.

                   *
- -------------------------------------------                           Director                            September 30, 1999
     David Naveh, Ph.D.

                   *
- -------------------------------------------                           Director                            September 30, 1999
     Richard Sperber


- ----------------------------
Robert J. Capetola
* As Attorney-in-fact
</TABLE>

864725.6

                                      II-4

<PAGE>





       EXHIBIT INDEX



EXHIBIT NO.    DESCRIPTION
- -----------    -----------

2.1*       Agreement  and  Plan of  Merger  dated  as of  March  5,  1998  among
           Discovery, ATI Acquisition Corp. and ATI.

2.2**      Agreement and Plan of Reorganization  and Merger dated as of July 16,
           1997, by and between Discovery and Old Discovery.

5.1+       Opinion of Battle Fowler LLP regarding the legality of the securities
           being registered.

16.1***    Letter  dated  January  28,  1998  from  Ernst  &  Young  LLP  to the
           Securities and Exchange Commission.

23.1+      Consent of Richard A. Eisner & Company, LLP.

24.1+      Powers of Attorney.

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

*       Incorporated  by reference to  Discovery's  Annual Report on Form 10-KSB
        for the year ending December 31, 1997.

**      Incorporated by reference to Discovery's  Registration Statement on Form
        S-4 (File No. 333-34337).

***     Incorporated  by reference to  Discovery's  Current Report on Form 8-K/A
        dated January 16, 1998.

+       Previously filed.




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