THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
         SECURITIES  ACT OF 1933,  AS AMENDED OR ANY STATE  SECURITIES  LAWS AND
         NEITHER THE SECURITIES NOR ANY INTEREST  THEREIN MAY BE OFFERED,  SOLD,
         TRANSFERRED,  PLEDGED OR  OTHERWISE  DISPOSED OF EXCEPT  PURSUANT TO AN
         EFFECTIVE  REGISTRATION  STATEMENT  UNDER  SUCH ACT OR SUCH  LAWS OR AN
         EXEMPTION FROM REGISTRATION  UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE
         OPINION OF COUNSEL  FOR THE  HOLDER,  WHICH  COUNSEL  AND  OPINION  ARE
         REASONABLY SATISFACTORY TO COUNSEL FOR THIS CORPORATION, IS AVAILABLE.


                             __________ ___, 199___


                      WARRANT TO PURCHASE SHARES OF COMMON
                       STOCK OF CHEUNG LABORATORIES, INC.


         This certifies that _____________ (the "Holder"), for a value received,
is entitled,  subject to the  adjustment and to the other terms set forth below,
to  purchase  from  Cheung  Laboratories,  Inc.,  a  Maryland  corporation  (the
"Company),  at the Stock  Purchase Price (as defined below) that number of fully
paid and nonassessable shares of the Company's $0.01 par value Common Stock (the
"Stock") as equals $________________  divided by the Stock Purchase Price. Stock
Purchase  Price shall be the average  price of the common stock of the public or
private  offerings  conducted  subsequent  to  the  offering  set  forth  in the
Memorandum of the Company dated  January 6, 1997 as  supplemented  June 12, 1997
and ending December 27, 1997 by the Company which raise,  in the aggregate,  not
less than $8,000,000  (hereafter  collectively  referred to as the  "Offering").
This Warrant shall be  exercisable  at any time on and after six months from the
date of the next public stock offering  ("Next Public  Offering") of the Company
(the  "Commencement  Date") but not later than 5:00 P.M.  (New York Time) on the
Expiration  Date (as  defined  below),  upon  surrender  to the  Company  at its
principle office at 10220-I Old Columbia Road,  Columbia,  Maryland  21046-1705,
Attention:  Dr. Augustine Cheung, Chairman of the Board of Directors (or at such
other  location  as the Company  may advise  Holder in writing) of this  Warrant
properly endorsed with the form of Subscription  Agreement  attached hereto duly
filled  in and  signed  and  upon  payment  in cash or  cashier's  check  of the
aggregate  Stock  Purchase Price for the number of shares for which this Warrant
is being  exercised  determined in accordance  with the provisions  hereof.  The
Stock  Purchase  Price and,  in some  cases,  the  number of shares  purchasable
hereunder  are subject to  adjustment  as provided in Section 3 of this Warrant.
This Warrant and all rights hereunder, to the extent not exercised in the manner
set forth  herein  shall  terminate  and become null and void on the  Expiration
Date. "Expiration Date" means 5:00 P.M. (New York Time) on the fifth anniversary
of the  Commencement  Date.  In the event that the Holder does not exercise this
Warrant  pursuant to the terms of this Warrant,  then this Warrant shall expire,
be  cancelled,  and be null and void.  This  Warrant is issued  pursuant  to the
subscription  agreement  dated the same date as this Warrant and executed by the
Holder,  for  the  Purchase  of a  secured  convertible  promissory  note in the
principal amount of $___________.

         This Warrant is subject to the following terms and conditions:

         1.       Exercise:  Issuance  of  Certificates;   Payment  for  Shares;
                  Conversion Right.
                  --------------------------------------------------------------

                  1.1   Duration  of  Exercise  of  Warrant.   This  Warrant  is
         exercisable  at the  option  of the  Holder at any time or from time to
         time but not earlier than on the  Commencement  Date or later than 5:00
         P.M. (New York Time) on the Expiration Date for all or a portion of the
         shares of Stock which may be purchased  hereunder.  The Company  agrees
         that the shares of Stock  purchased under this Warrant shall be and are
         deemed to be issued to Holder as the record owner of such shares at the
         close of  business  on the date on which this  Warrant  shall have been




         surrendered and payment made for such shares. Subject to the provisions
         of  Section  2,  certificates  for the  shares  of Stock so  purchased,
         together  with any other  securities  or  property  to which  Holder is
         entitled  upon  such  exercise,  shall be  delivered  to  Holder by the
         Company  or its  transfer  agent  at the  Company's  expense  within  a
         reasonable time after the rights  represented by this Warrant have been
         exercised.  Each  stock  certificate  so  delivered  shall  be in  such
         denominations  of Stock as may be  requested  by  Holder  and  shall be
         registered  in the  name of  Holder  or such  other  name as  shall  be
         designated by Holder. If, upon exercise of this Warrant, fewer than all
         of the shares of Stock evidenced by this Warrant are purchased prior to
         the  Expiration  Date  of  this  Warrant,  one  or  more  new  warrants
         substantially in the form of, and on the terms in, this Warrant will be
         issued for the remaining  number of shares of Stock not purchased  upon
         exercise of this Warrant.

         2.  Shares  to Be  Fully  Paid:  Reservation  of  Shares.  The  Company
covenants  and  agrees  that all  shares of Stock  which may be issued  upon the
exercise of this Warrant (the "Warrant  Shares") shall,  upon issuance,  be duly
authorized,  validly  issued,  fully  paid and  nonassessable  and free from all
preemptive  rights of any stockholder and free of all taxes,  liens, and charges
with respect to the issuance thereof.  The Company will take all such reasonable
actions as may be necessary to assure that such shares of Stock may be issued as
provided herein without violation of any applicable law or regulation, or of any
requirements of any domestic  securities  exchange or automated quotation system
upon which the Stock may be listed.

         3.  Adjustment of Stock Purchase Price and Number of Shares.  The Stock
Purchase  Price and, in some cases,  the number of shares  purchasable  upon the
exercise of this Warrant shall be subject to  adjustment  from time to time upon
the occurrence of certain events described in this Section 3.

                  3.1 Split or Combination of Stock and Stock Dividend:  In case
         the Company shall at any time subdivide its outstanding shares of Stock
         into a greater  number of shares or declare a  dividend  upon its Stock
         payable  solely in shares of Stock,  the Stock Purchase Price in effect
         immediately   prior  to  such  subdivision  or  declaration   shall  be
         proportionally reduced, and the number of shares issuable upon exercise
         of the Warrant shall be proportionately increased.  Conversely, in case
         the outstanding shares of Stock of the Company shall be combined into a
         smaller  number of shares (such as a reverse  stock  split,  but not to
         include the  anticipated  redemption of 4,000,000  shares of stock from
         Mr. Gao pursuant to a Redemption  Agreement,  as amended, now in effect
         with Mr. Gao) the Stock Purchase Price in effect  immediately  prior to
         such combination shall be proportionately  increased, and the number of
         shares  issuable upon exercise of the Warrant shall be  proportionately
         reduced.

                  3.2  Dilutive  Issuances.   If  prior  to  completion  of  the
         Company's Next Public Offering,  the Company shall sell or issue at any
         time  after  the date of this  Warrant  and  prior to its  termination,
         shares of Stock  (other  than  Excluded  Stock,  as  defined in Section
         3.2.5) at a consideration per share less than the Stock Purchase Price,
         then,  upon such sale or issuance,  the Stock  Purchase  Price shall be
         reduced to the lower of the prices  (calculated  to the  nearest  cent)
         determined as follows:  by dividing (i) the sum of (A) the total number
         of shares of Stock  Outstanding (as defined in Section 3.2.1) below and
         subject  to  adjustment  in  the  manner  set  forth  in  Section  3.1)
         immediately   prior  to  such  issuance  or  sale   multiplied  by  the
         then-existing  Stock  Purchase  Price,  plus (B) the  aggregate  of the
         amount of all consideration,  if any, received by the Company upon such
         issuance  or  sale,  by (ii)  the  total  number  of  shares  of  Stock
         Outstanding immediately after such issuance or sale.

                           3.2.1 Definitions.  For purposes of this Section 3.2,
                  the following definitions shall apply:

                                    (a) "Convertible  Securities" shall mean any
                           indebtedness or equity securities convertible into or
                           exchangeable for Stock.

                                    (b)  "Options"   shall   mean  any   rights,
                           warrants  or options  to  subscribe  for or  purchase
                           Stock or Convertible Securities.


                                    (c)  "Stock  Outstanding:   shall  mean  the
                           aggregate of all Stock of the Company outstanding and
                           all Stock  issuable upon exercise of all  outstanding
                           Options and conversion of all outstanding Convertible
                           Securities.

                           3.2.2  For the  purposes  of this  Section  3.2,  the
                  following provisions shall also be applicable:

                                    (a) Cash  Consideration.  In the case of the
                           issuance or sale of  additional  Stock for cash,  the
                           consideration  received by the Company therefor shall
                           be deemed to be the  amount of cash  received  by the
                           Company  for such  shares  (or,  if such  shares  are
                           offered  by  the   Company  for   subscription,   the
                           subscription  price,  or, if such  shares are sold to
                           underwriters or dealers for public offering without a
                           subscription  offering,  the public offering  price),
                           without  deducting   therefrom  any  compensation  or
                           discount paid or allowed to  underwriters  or dealers
                           or  others  performing  similar  services  or for any
                           expenses incurred in connection therewith.

                                    (b) Non-Cash  Consideration.  In case of the
                           issuance  (other than upon  conversion or exchange of
                           Convertible  Securities) or sale of additional Stock,
                           Options or Convertible Securities for a consideration
                           other  than cash or a  consideration  a part of which
                           shall be other than cash,  the fair  market  value of
                           such  consideration  as  determined  by the  Board of
                           Directors  of the Company in the good faith  exercise
                           of  its  business   judgment,   irrespective  of  the
                           accounting  treatment thereof,  shall be deemed to be
                           the value,  for  purposes  of this  Section 3, of the
                           consideration other than cash received by the Company
                           for such securities.

                                    (c) Options and Convertible  Securities.  In
                           case the Company  shall in any manner  issue or grant
                           any Options or any Convertible Securities,  the total
                           maximum  number of shares of Stock  issuable upon the
                           exercise  of  such  Options  or  upon  conversion  or
                           exchange  of  the  total   maximum   amount  of  such
                           Convertible  Securities at the time such  Convertible
                           Securities  first become  convertible or exchangeable
                           shall  (as of the  date of  issue  or  grant  of such
                           Options  or,  in the  case  of the  issue  or sale of
                           Convertible  Securities other than where the same are
                           issuable upon the exercise of Options, as of the date
                           of such  issue or sale) be deemed to be issued and to
                           be  outstanding  for the purpose of this  Section 3.2
                           and to have been issued for the sum of the amount (if
                           any) paid for such Options or Convertible  Securities
                           plus the amount (if any) payable upon the exercise of
                           such Options or upon  conversion  or exchange of such
                           Convertible  Securities at the time such  Convertible
                           Securities first become  convertible or exchangeable;
                           provided  that,  subject to the provisions of Section
                           3.2.3,  no further  adjustment of the Stock  Purchase
                           Price  shall be made upon the actual  issuance of any
                           such  Stock  or  Convertible  Securities  or upon the
                           conversion  or  exchange  of  any  such   Convertible
                           Securities.

                           3.2.3  Change in Option Price or  Conversion.  In the
                  event  that the  purchase  price  provided  for in any  Option
                  referred to in subsection 3.2.2.(c),  or the rate at which any
                  Convertible Securities referred to in subsection 3.2.2.(c) are
                  convertible  into or  exchangeable  for shares of Stock  shall
                  change at any time or any  additional  consideration  shall be
                  payable in  connection  with the exercise of any Option or the
                  conversion or exchange of any Convertible Security (other than
                  under or by reason of provisions  designed to protect  against
                  dilution upon the  occurrence of events of the type  described
                  in this  Section 3),  then,  for  purposes  of any  adjustment
                  required by Section 3.2, the Stock Purchase Price in effect at
                  the time of such event shall  forthwith be  readjusted  to the
                  Stock  Purchase  Price  that would have been in effect at such
                  time  had  such  Options  or  Convertible   Securities   still


                  outstanding   provided  for  such  changed   purchase   price,
                  conversion rate or additional  consideration,  as the case may
                  be, at the time initially  granted,  issued or sold,  provided
                  that if such readjustment is an increase in the Stock Purchase
                  Price,  such  readjustment  shall not  exceed  the  amount (as
                  adjusted by Sections 3.2 and 3.2) by which the Stock  Purchase
                  Price was decreased  pursuant to Section 3.2 upon the issuance
                  of the Option or Convertible Security.

                           3.2.4 Termination of Option or Conversion  Rights. In
                  the event of the  termination  or  expiration  of any right to
                  purchase Stock under any Option granted after the date of this
                  Warrant  or of any right to convert  or  exchange  Convertible
                  Securities  issued after the date of this  Warrant,  the Stock
                  Purchase  Price shall,  upon such  termination,  be readjusted
                  after the Stock  Purchase Price that would have been in effect
                  at the time of such  expiration or termination had such Option
                  or Convertible Security, to the extent outstanding immediately
                  prior to such  expiration or  termination,  never been issued,
                  and the shares of Stock issuable  thereunder  shall not longer
                  be  deemed  to be  Stock  Outstanding,  provided  that if such
                  readjustment is an increase in the Stock Purchase Price,  such
                  readjustment  shall not  exceed the  amount  (as  adjusted  by
                  Sections  3.1 and 3.2) by which the Stock  Purchase  Price was
                  decreased  pursuant  to Section  3.2 upon the  issuance of the
                  Option or Convertible Security.  The termination or expiration
                  of any right to purchase  Stock under any Option granted prior
                  to the date of this  Warrant  or of any  right to  convert  or
                  exchange  Convertible  Securities  issued prior to the date of
                  this  Warrant  shall not trigger any  adjustment  to the Stock
                  Purchase  Price,  but the shares of Stock  issuable under such
                  Options or Convertible  Securities shall not longer be counted
                  in  determining  the number of shares of Stock  Outstanding on
                  the  date  of  issuance  of  this   Warrant  for  purposes  of
                  subsequent calculations under this Section 3.2

                           3.2.5 Excluded Stock. Notwithstanding anything herein
                  to  the  contrary,  the  Stock  Purchase  Price  shall  not be
                  adjusted  pursuant  to  this  Section  3.2  by  virtue  of the
                  issuance and/or sale of Excluded  Stock,  which shall mean the
                  following:   (a)  Stock,  Options  or  Convertible  Securities
                  representing up to 2,000,000  shares of Stock (or such greater
                  number  of  shares  of Stock  as  authorized  by the  Board of
                  Directors)  in the  aggregate  to be  issued  and/or  sold  to
                  employees,  advisors, directors or officers of, or consultants
                  to, the Company or any of its subsidiaries pursuant to a stock
                  grant, stock option plan,  restricted stock agreements,  stock
                  purchase  plan,  pension or profit sharing plan or other stock
                  agreement or  arrangement  approved by the Company's  Board of
                  Directors, (b) the issuance of shares of Stock, Options and/or
                  Convertible  Securities pursuant to Options and/or Convertible
                  Securities  outstanding  as of the date of this  Warrant;  (c)
                  issuance of shares of Stock and/or  Convertible  Securities to
                  the Placement Agent in respect of the transaction  represented
                  by the subscription  agreement related to the issuance of this
                  Warrant;  and (d) the issuance of shares of Stock,  Options or
                  Convertible  Securities as a stock  dividend or upon any split
                  or combination  of shares of Stock or Convertible  Securities.
                  For all  purposes of this  Section 3.2, all shares of Excluded
                  Stock  shall be deemed to have  been  issued  for an amount of
                  consideration  per share equal to the initial  Stock  Purchase
                  Price  (subject  to  adjustment  in the  manner  set  forth in
                  Section 3.1).

                  3.3 Notice of  Adjustment.  Promptly  after  adjustment of the
         Stock  Purchase  Price or any  increase  or  decrease  in the number of
         shares purchasable upon the exercise of this Warrant, the Company shall
         give written notice  thereof,  by first-class  mail,  postage  prepaid,
         addressed  to the  registered  Holder of this Warrant at the address of
         such Holder as shown on the books of the  Company.  The notice shall be
         signed by the Company's  President or Chief Executive Officer and shall
         state the effective date of the adjustment and the Stock Purchase Price
         resulting from such adjustment and the increase or decrease, if any, in
         the number of shares  purchasable  at such price upon the  exercise  of
         this  Warrant,  setting  forth  in  reasonable  detail  the  method  of
         calculation and the facts upon which such calculation is based.




                  3.4      Notices.  If at any time:
                           -------

                           3.4.1 the Company  shall  declare  any cash  dividend
                  upon its Stock;

                           3.4.2 the Company shall declare any dividend upon its
                  Stock payable in stock (other than a dividend  payable  solely
                  in  shares of Stock)  or make any  special  dividend  or other
                  distribution to the Holder of its Stock;

                           3.4.3 there shall be any  consolidation  or merger of
                  the  Company  with  another  corporation,  or a sale of all or
                  substantially   all  of  the   Company's   assets  to  another
                  corporation; or

                           3.4.4  there  shall  be a  voluntary  or  involuntary
                  dissolution, liquidation or winding-up of the Company

         then,  in any one or more of said  cases,  the Company  shall give,  by
         certified  or  registered  mail,  postage  prepaid,  addressed  to  the
         registered  Holder of this  Warrant at the  address  of such  Holder as
         shown on the books of the Company,  (i) at least 30 days prior  written
         notice of the date on which the books of the  Company  shall close or a
         record shall be taken for such dividend,  distribution  or subscription
         rights  or for  determining  rights  to vote  in  respect  of any  such
         dissolution,  liquidation  or  winding-up;  (ii) at least 10 days prior
         written  notice  of the date on which the  books of the  Company  shall
         close or a record  shall be taken  for  determining  rights  to vote in
         respect of any such  reorganization,  reclassification,  consolidation,
         merger  or sale,  and  (iii)  in the  case of any such  reorganization,
         reclassification, consolidation, merger, sale, dissolution, liquidation
         or  winding-up,  at least 30 days  written  notice of the date when the
         same shall take place.  Any notice given in accordance  with clause (i)
         above  shall  also  specify,   in  the  case  of  any  such   dividend,
         distribution  or option  rights,  the date on which the Holder of Stock
         shall be entitled  thereto.  Any notice given in accordance with clause
         (iii) above shall also specify the date on which the Holder(s) of Stock
         shall be  entitled  to exchange  their  Stock for  securities  or other
         property  deliverable  upon  such   reorganization,   reclassification,
         consolidation, merger, sale, dissolution, liquidation or winding-up, as
         the case may be. If the Holder of the Warrant  does not  exercise  this
         Warrant prior to the occurrence of an event described above,  except as
         provided in Sections  3.1 and 3.5,  the Holder shall not be entitled to
         receive the benefits  accruing to existing holders of the Stock in such
         event.  Notwithstanding  anything herein to the contrary, if and to the
         extent the Holder  chooses to exercise  this Warrant  within the 10-day
         period following  receipt of the notice specified in clause (ii) above,
         the  Holder  may elect to pay the  aggregate  Stock  Purchase  Price by
         delivering  to the Company  cash or a cashier's  check in the amount of
         the  aggregate par value of the shares of Stock to be purchased and the
         Holder's full recourse  Promissory Note in the amount of the balance of
         the aggregate Stock Purchase Price,  which Note shall be payable to the
         order of the Company in a single sum on the 30th day following the date
         of  receipt  of such  notice  and shall  bear  interest  at the  lowest
         applicable  federal  short-term  rate (using  monthly  compounding)  as
         established pursuant to Section 1274(d) of the Internal Revenue Code of
         1986, as amended, or any successor provision;  provided,  however, that
         if the Holder elects to deliver such a Promissory  Note to the Company,
         the Holder will pledge to the  Company all Stock  issued in  connection
         with  the  exercise  of this  Warrant,  and the  Company  shall  retain
         possession of the certificates  evidencing such Stock,  until such time
         as the Note is paid in full.

                  3.5  Changes  in  Stock.  In case at any  time  following  the
         Commencement  Date  hereof,  the  Company  shall  be  a  party  to  any
         transaction (including,  without limitation,  a merger,  consolidation,
         sale  of  all  or   substantially   all  of  the  Company's  assets  or
         recapitalization  of the  Stock)  in which the  previously  outstanding
         Stock shall be changed into or exchanged  for  different  securities of
         the Company or common stock or other securities of another  corporation
         or  interests in a  noncorporate  entity or other  property  (including
         cash) or any combination of any of the foregoing (each such transaction
         being herein called the  "Transaction"  and the date of consummation of
         the Transaction being herein called the "Consummation Date"), then as a
         condition of the consummation of the  Transaction,  lawful and adequate
         provisions shall be made so that each Holder,  upon the exercise hereof
         on or before the Consummation  Date, shall be entitled to receive,  and


         this Warrant shall thereafter  represent the right to receive,  in lieu
         of the Stock  issuable  upon such  exercise  prior to the  Consummation
         Date,  the highest amount of securities or other property to which such
         Holder would  actually  have been  entitled as a  stockholder  upon the
         consummation  of the  Transaction  if such  Holder had  exercised  such
         Warrant  immediately prior thereto.  The provisions of this Section 3.5
         shall similarly apply to successive Transactions.

                  3.6 Termination of Dilutive Protection.  Immediately following
         the Next Public Offering all antidilution  provisions of this Section 3
         shall become null, void and of no further force or effect.

         4. Issue Tax. The issuance of certificates for shares of Stock upon the
exercise  of the  Warrant  shall be made  without  charge  to the  Holder of the
Warrant  for any issue  tax in  respect  thereof,  provided,  however,  that the
Company  shall not be required to pay any tax which may be payable in respect of
any transfer involved in the issuance and delivery of any certificates in a name
other than that of the then Holder of the Warrant being exercised.

         5. No Voting or  Dividend  Rights;  Limitation  of  Liability.  Nothing
contained in this  Warrant  shall be  construed  as  conferring  upon the Holder
hereof the right to vote or to consent or to receive  notice as a stockholder in
respect of meetings of stockholders for the election of directors of the Company
or any other matters or any rights  whatsoever as a stockholder  of the Company.
Except for the adjustment to the Stock Purchase Price pursuant to Section 3.1 in
the event of a dividend on the Stock payable in shares of Stock, no dividends or
interest  shall be payable or accrued in respect of this Warrant or the interest
represented  hereby or the shares  purchasable  hereunder until, and only to the
extent that, this Warrant shall have been exercised.  No provisions  hereof,  in
the absence of affirmative action by the Holder to purchase shares of Stock, and
no mere  enumeration  herein of the rights or privileges  of the Holder  hereof,
shall give rise to any liability of such Holder for the Stock  Purchase Price or
as a  stockholder  of the  Company  whether  such  liability  is asserted by the
Company or by its creditors.

         6.  Restrictions  on  Transferability  of Securities;  Compliance  with
             Securities Act.
             -------------------------------------------------------------------

                  6.1  Restrictions  on  Transferability.  This  Warrant and the
         Warrant  Shares (the  "Securities")  shall not be  transferable  in the
         absence  of  Registration  under  the  Act  (as  defined  below)  or an
         exemption therefrom under said Act.

                  6.2 Restrictive  Legend.  Each  certificate  representing  the
         Securities or any other securities  issued in respect of the Securities
         upon  any  stock  split,  stock  dividend,  recapitalization,   merger,
         consolidation or similar event, shall be stamped or otherwise imprinted
         with a legend  substantially  in the following form (in addition to any
         legend required under applicable state securities laws):


THE SECURITIES  REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES
NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE
DISPOSED OF EXCEPT  PURSUANT TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER SUCH
ACT OR SUCH LAWS OR AN EXEMPTION FROM REGISTRATION  UNDER SUCH ACT AND SUCH LAWS
WHICH,  IN THE OPINION OF COUNSEL FOR THE HOLDER,  WHICH COUNSEL AND OPINION ARE
REASONABLY SATISFACTORY TO COUNSEL FOR THIS COMPANY, IS AVAILABLE.

         7.  Registration  Rights.  The  Holder of this  Warrant  shall have the
registration rights set forth in the Registration Rights Agreement of even date.

         8.  Modification and Waiver.  This Warrant and any provision hereof may
be changed,  waived,  discharged or terminated  only by an instrument in writing
signed by the party against which enforcement of the same is sought.

         9. Notices. Any notice, request or other document required or permitted
to be given or delivered to the Holder  hereof or the Company shall be delivered




or shall be sent by certified or registered mail, postage prepaid,  to each such
Holder at its  address as shown on the books of the Company or to the Company at
the address indicated therefor in the first paragraph of this Warrant.

         10. Description Headings and Governing Law. The descriptive headings of
the several sections and paragraphs of this Warrant are inserted for convenience
only  and do not  constitute  a part of this  Warrant.  This  Warrant  shall  be
construed and enforced in accordance  with,  and the rights of the parties shall
be governed by, the internal laws of the State of Maryland.

         11. Lost Warrants or Stock  Certificates.  The Company  represents  and
warrants to Holder the upon receipt of evidence  reasonably  satisfactory to the
Company of the loss,  theft,  destruction  or mutilation of any Warrant or stock
certificate  and,  in the case of any such loss,  theft or  destruction,  and if
requested,  upon receipt of an indemnity  bond  reasonably  satisfactory  to the
Company, or in the case of any such mutilation,  upon surrender and cancellation
of such Warrant or stock  certificate,  the Company at its expense will make and
deliver a new Warrant or stock certificate,  of like tenor, in lieu of the lost,
stolen, destroyed or mutilated Warrant or stock certificate.

         12.  Fractional  Shares.  No  fractional  shares  shall be issued  upon
exercise of this Warrant.  The Company shall,  in lieu of issuing any fractional
share pay the Holder  entitled to such  fraction a sum in cash equal to the fair
market  value of any such  fractional  interest as it shall appear on the public
market,  or if there is no  public  market  for  such  shares,  then as shall be
reasonably determined by the Company.

         IN WITNESS WHEREOF,  the Company has caused this Warrant to be executed
by its officer, thereunto duly authorized as of this ____ day of ________, ____.

                                                     CHEUNG LABORATORIES, INC.




By:_________________________________________
                                                     Signature



By:_________________________________________
                                                     Print Name
                                                     Title:_____________________




FORM OF SUBSCRIPTION AGREEMENT

              (To be signed and delivered upon exercise of Warrant)

[DATE]

Attention:  _______________
Cheung Laboratories, Inc.
10220-I Old Columbia Road
Columbia, Maryland  21046-1705

Dear __________:

         The undersigned,  the Holder of the within Warrant,  hereby irrevocably
elects to exercise the purchase  rights  represented by such Warrant for, and to
purchase  thereunder,  _______ shares of Common Stock, par value $0.01 per share
(the "Common Stock") of Cheung Laboratories, Inc. (the "Company") and subject to
the  following  paragraph,  herewith  makes payment of  _______________  Dollars
($________)  therefor  and  requests  that the  certificates  for such shares be
issued in the name of, and delivered to, _________________________________ whose
address is       .

         If the  shares  issuable  upon the  exercise  of this  Warrant  are not
covered by a registration  statement effective under the Securities Act of 1933,
as amended,  (the "Securities  Act"), the undersigned  represents as of the date
hereof that:

                  (i)  the  undersigned  is  acquiring  such  Common  Stock  for
investment for his own account,  not as nominee or agent, and not with a view to
the  distribution  thereof  and the  undersigned  has not  signed  or  otherwise
arranged  for  the  selling,   granting  any   participation  in,  or  otherwise
distributing the same,

                  (ii) the  undersigned  has such  knowledge  and  experience in
financial  and business  matters as to be capable of  evaluating  the merits and
risks of the undersigned's investment in the Common Stock,

                  (iii) the  undersigned has received all of the information the
undersigned   has  requested  from  the  Company  and  considers   necessary  or
appropriate for deciding whether to purchase the shares of Common Stock,

                  (iv) the undersigned has the ability to bear the economic risk
of his prospective investment,

                  (v) the undersigned is able, without materially  impairing his
financial condition, to hold the shares of Common Stock for an indefinite period
of time and to suffer complete loss on his investment,

                  (vi) the undersigned understands and agrees that (A) he may be
unable to readily  liquidate  his  investment  in the shares of Common Stock and
that  the  shares  must be held  indefinitely  unless a  subsequent  disposition
thereof is registered or qualified under the Securities Act and applicable state
securities   or  Blue  Sky  laws  or  is  exempt  from  such   registration   or
qualification,  and that the Company is not  required to register the same or to
take any  action  or make  such an  exemption  available  except  to the  extent
provided in the within Warrant,  and (B) the exemption from  registration  under
the  Securities  Act  afforded by Rule 144  promulgated  by the  Securities  and
Exchange  Commission  ("Rule  144")  depends  upon the  satisfaction  of various




conditions by the undersigned and the Company and that, if applicable,  Rule 144
affords the basis for sales under certain  circumstances in limited amounts, and
that if such exemption is utilized by the  undersigned,  such conditions must be
fully complied with by the undersigned and the Company, as required by Rule 144,

                  (vii) the  undersigned  is (A) familiar with the definition of
and the undersigned is an "accredited  investor" within the meaning of such term
under Rule 501 of Regulation D promulgated  under the Securities  Act, or (B) is
providing  representations and warranties reasonably satisfactory to the Company
and its  counsel,  to the effect that the sale and issuance of Common Stock upon
exercise of such Warrant may be made without  registration  under the Securities
Act or any applicable state securities and Blue Sky laws, and

                  (viii) the  address  set forth  above is the true and  correct
address of the undersigned's residence.

 Dated: ________________



- --------------------------------------------
                                                                       Signature

Signature must conform in all respects to the name of Holder as specified on the
face of the Warrant.