THE SECURITIES  REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED AND MAY
NOT  BE  TRANSFERRED  UNLESS  (A)  THE  STOCKHOLDER  WISHING  TO  TRANSFER  SUCH
SECURITIES PROVIDES AN OPINION OF COUNSEL REASONABLY CONCURRED IN BY COUNSEL FOR
BENTLEY PHARMACEUTICALS, INC. (THE "COMPANY") STATING THAT THE PROPOSED TRANSFER
OF THE COMPANY'S  SECURITIES  IS EXEMPT FROM OR NOT SUBJECT TO THE  REGISTRATION
PROVISIONS OF ALL APPLICABLE FEDERAL AND STATE LAWS; OR (B) SAID SECURITIES HAVE
BEEN REGISTERED PURSUANT TO THE SECURITIES ACT OF 1933, AS AMENDED.


                                                               February 11, 1999



                          BENTLEY PHARMACEUTICALS, INC.

                     The Transferability of this Warrant is

                       Restricted as Provided in Article 3


                  In partial  consideration  of the  purchase of certain  assets
under an Asset  Purchase  Agreement  dated  February  1,  1999  effective  as of
December  31, 1998  between  Bentley  Pharmaceuticals,  Inc. and Yungtai Hsu and
other  good  and  valuable  consideration,   the  receipt  of  which  is  hereby
acknowledged by BENTLEY PHARMACEUTICALS, INC., Two Urban Centre, Suite 400, 4890
West  Kennedy  Boulevard,  Tampa,  Florida  33609,  a Florida  corporation  (the
"Company"),  YUNGTAI HSU (the "Holder") is hereby granted the right to purchase,
at the initial  exercise price of $ 1.50 per share, at any time until 5:00 P.M.,
New York time,  on December 31,  2008,  Four Hundred  Fifty  Thousand  (450,000)
shares of the Company's common stock, $.02 par value per share (the "Shares").

                  This Warrant  initially is exercisable at a price of $1.50 per
Share  payable  in cash or by  certified  or  official  bank  check  in New York
Clearing  House funds,  subject to  adjustment  as provided in Article 6 hereof.
Upon  surrender  of this  Warrant,  with  the  annexed  Subscription  Form  duly
executed,  together with payment of the Purchase Price (as hereinafter  defined)
for the Shares purchased,  at the offices of the Company,  the registered holder
of this Warrant (the  "Holder")  shall be entitled to receive a  certificate  or
certificates for the Shares so purchased.

                  THIS  WARRANT MAY NOT BE  EXERCISED  AND THE SHARES MAY NOT BE
ISSUED UNTIL A LISTING  APPLICATION  RELATING TO THE SHARES HAS BEEN APPROVED BY
ALL SECURITIES  EXCHANGES ON WHICH THE SHARES OF THE COMPANY'S  COMMON STOCK MAY
THEN BE LISTED AND/OR QUOTED.





1.       Exercise of Warrant.

                  The   purchase   rights   represented   by  this  Warrant  are
exercisable at the option of the Holder hereof,  in whole or in part (but not as
to fractional Shares  underlying this Warrant),  during any period in which this
Warrant may be exercised as set forth above. In the case of the purchase of less
than all the Shares  purchasable  under this  Warrant,  the Company shall cancel
this  Warrant  upon the  surrender  hereof and shall  execute  and deliver a new
Warrant of like tenor for the balance of the Shares purchasable hereunder.

2.       Issuance of Certificates.

                  Upon  the   exercise  of  this   Warrant,   the   issuance  of
certificates for Shares  underlying this Warrant shall be made forthwith (and in
any event within five business  days  thereafter)  without  charge to the Holder
hereof including, without limitation, any tax which may be payable in respect of
the issuance thereof,  and such certificates shall (subject to the provisions of
Articles 3 hereof) be issued in the name of, or in such names as may be directed
by, the Holder hereof; 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 such  certificates in a name other than that of the
Holder  and  the  Company  shall  not be  required  to  issue  or  deliver  such
certificates  unless or until the  person or  persons  requesting  the  issuance
thereof  shall  have paid to the  Company  the  amount of such tax or shall have
established to the  satisfaction of the Company that such tax has been paid. The
certificates  representing the Shares  underlying this Warrant shall be executed
on behalf of the  Company by the  manual or  facsimile  signature  of one of the
present or any future  Chairman or  President  of the Company and any present or
future Vice President or Secretary of the Company.

3.       Restriction on Transfer of Warrant.

                  The  Holder  of  this  Warrant,   by  its  acceptance  hereof,
covenants and agrees that this Warrant is being  acquired as an  investment  and
not with a view to the  distribution  hereof,  and that it may not be exercised,
sold, transferred,  assigned, hypothecated or otherwise disposed of, in whole or
in part  except as  provided  in  Section  13 below or unless in the  opinion of
counsel  concurred in by the  Company's  counsel such  transfer is in compliance
with all applicable securities laws.

4.       Price.

         (a) Initial and Adjusted  Purchase  Price.  The initial  purchase price
shall be $1.50 per Share.  The adjusted  purchase price shall be the price which
shall  result  from time to time  from any and all  adjustments  of the  initial
purchase price in accordance with the provisions of Article 5 hereof.

         (b) Purchase  Price.  The term  "Purchase  Price" herein shall mean the
initial  purchase  price or the  adjusted  purchase  price,  depending  upon the
context.

                                       -2-





5.       Adjustments of Purchase Price and Number of Shares.

         (a) Subdivision and Combination.  In case the Company shall at any time
subdivide or combine the outstanding  Shares, the Purchase Price shall forthwith
be proportionately decreased in the case of subdivision or increased in the case
of combination.

         (b)  Adjustment  in  Number of  Shares.  Upon  each  adjustment  of the
Purchase  Price  pursuant  to the  provisions  of this  Article 5, the number of
Shares  issuable  upon the  exercise  of this  Warrant  shall be adjusted to the
nearest full Share by multiplying a number equal to the Purchase Price in effect
immediately  prior to such  adjustment  by the  number of Shares  issuable  upon
exercise of this Warrant  immediately  prior to such adjustment and dividing the
product so obtained by the adjusted Purchase Price.

         (c)  Reclassification,  Consolidation,  Merger,  etc.  In  case  of any
reclassification or change of the outstanding Shares (other than a change in par
value to no par value,  or from no par value to par  value,  or as a result of a
subdivision or combination),  or in the case of any consolidation of the Company
with,  or  merger  of  the  Company  into,  another  corporation  (other  than a
consolidation  or merger in which the Company is the surviving  corporation  and
which  does not  result in any  reclassification  or  change of the  outstanding
Shares,  except a change as a result of a  subdivision  or  combination  of such
shares  or a change in par  value,  as  aforesaid),  or in the case of a sale or
conveyance to another corporation of the property of the Company as an entirety,
the Holder of this Warrant shall  thereafter have the right to purchase upon the
exercise  of this  Warrant  the kind and  number  of  shares  of stock and other
securities  and  property   receivable  upon  such   reclassification,   change,
consolidation, merger, sale or conveyance as if the Holder were the owner of the
Shares  underlying  this  Warrant  immediately  prior to any such  events at the
Purchase  Price  in  effect  immediately  prior  to the  record  date  for  such
reclassification,  change, consolidation,  merger, sale or conveyance as if such
Holder had exercised this Warrant.

6.       Exchange and Replacement of Warrant.

                  This  Warrant  is  exchangeable  without  expense,   upon  the
surrender hereof by the registered  Holder at the principal  executive office of
the  Company  for a new  Warrant  of like  tenor  and date  representing  in the
aggregate  the right to purchase  the same  number of Shares as are  purchasable
hereunder in such  denominations  as shall be designated by the Holder hereof at
the time of such surrender.

                  Upon   receipt   by  the   Company  of   evidence   reasonably
satisfactory  to it of the  loss,  theft,  destruction  or  mutilation  of  this
Warrant,  and, in case of loss,  theft or destruction,  of indemnity or security
reasonably  satisfactory  to  it,  and  reimbursement  to  the  Company  of  all
reasonable expenses  incidental thereto,  and upon surrender and cancellation of
this Warrant,  if mutilated,  the Company will make and deliver a new Warrant of
like tenor, in lieu of this Warrant.

                                       -3-





7.       Elimination of Fractional Interests.

                  The  Company  shall  not be  required  to  issue  certificates
representing  fractions of Shares on the exercise of this Warrant,  nor shall it
be required to issue scrip or pay cash in lieu of fractional interests, it being
the intent of the parties  that all  fractional  interests  shall be  eliminated
pursuant to Section 5(b).

8.       Reservation and Listing of Securities.

                  The Company shall at all times reserve and keep  available out
of its authorized  Shares,  solely for the purpose of issuance upon the exercise
of this  Warrant,  such number of Shares as shall be issuable  upon the exercise
hereof and thereof. The Company covenants and agrees that, upon exercise of this
Warrant and payment of the Purchase  Price  therefor,  all Shares  issuable upon
such exercise shall be duly and validly issued,  fully paid and  non-assessable.
As long as  this  Warrant  shall  be  outstanding,  the  Company  shall  use its
reasonable  best efforts to cause all Shares  issuable upon the exercise of this
Warrant to be listed  (subject to official notice of issuance) on all securities
exchanges on which the Shares of the  Company's  Common Stock may then be listed
and/or quoted.

9.       Repurchase at Option of Holder.

         (a) If on December 31, 2000 (the "Repurchase  Date"),  the Market Price
(as defined  herein) does not equal or exceed 150 % of the Purchase  Price,  the
Holder shall have the right (the "Put Right") to require the Company to purchase
all or a portion of this  Warrant  relating to that  number of Shares  which the
Holder is relinquishing its right to purchase (the "Relinquished Shares"), for a
price equal to $0.50  (fifty  cents)  multiplied  by the number of  Relinquished
Shares.  The Put Right must be exercised by a written  notice from the Holder to
the Company  within ten (10) days of the  Repurchase  Date and the Company shall
pay to the Holder the amounts owing hereunder within ten (10) days of receipt of
such  notice,  this  Warrant  and such other  documentation  as the  Company may
reasonably require.

         (b) The Put Right shall not be exercisable by the Holder if, during any
twenty  consecutive  trading  days  between the issuance of this Warrant and the
Repurchase  Date,  the Market  Price shall be equal to or greater than $3.00 per
share.

         (c) The "Market  Price" per share on any date shall be deemed to be the
daily closing price per share. The closing price per Share for each day shall be
the last  reported  sales price regular way or, in case no such sale takes place
on such day,  the average of the closing bid and asked  prices  regular  way, in
either  case on the  American  Stock  Exchange,  or, if the Common  Stock is not
listed or admitted to trading on the American Stock  Exchange,  on the principal
national  securities exchange on which the Common Stock is listed or admitted to
trading,  or if it is  not  listed  or  admitted  to  trading  on  any  national
securities exchange or no such quotations are available,  the last reported sale
price, or if not so reported, the average of the closing bid and asked prices as
furnished by any New York Stock Exchange  member firm selected from time to time
by the Company for that purpose, or,

                                       -4-





if no such quotations are available, the fair market value as determined in good
faith in the  exercise  of their  reasonable  business  judgment by the Board of
Directors of the Company.

10.      Repurchase at Option of the Company

                  This  Warrant  may be redeemed at the option of the Company at
any time,  at a  redemption  price of $0.05 per Share for which the  Warrant  is
exercisable,  provided  the Market  Price for the  Shares  for any  twenty  (20)
consecutive trading days after the issuance of this Warrant shall be equal to or
greater than $5.00 per share.  Notice of redemption shall be given in writing to
the Holder not less than ten days before the date fixed for  redemption.  On and
after the date  fixed for  redemption,  the  Holder  shall  have no rights  with
respect to this Warrant  except to receive the $0.05 per Share upon surrender of
the Warrant.

11.      Notices.

                  All notices,  demands or other  communications  to be given or
delivered  under or by  reason of the  provisions  of this  Warrant  shall be in
writing and shall be deemed to have been given (a) when delivered  personally to
the   recipient,   (b)  when  sent  to  the   recipient  by  telecopy   (receipt
electronically confirmed by sender's telecopy machine) if during normal business
hours of the recipient, otherwise on the next Business Day, (c) one Business Day
after the date when sent to the recipient by reputable  express  courier service
(charges  prepaid) or (d) seven  Business Days after the date when mailed to the
recipient by certified or registered mail,  return receipt requested and postage
prepaid. Such notices, demands and other communications will be sent:

                  (a)  if  to  the  registered  Holder  of  this Warrant, to the
         address of such Holder as shown on the books of the Company; or

                  (b) if to the  Company,  to the address set forth on the first
         page of this  Warrant  or to such  other  address  as the  Company  may
         designate by notice to the Holder.

12.      Amendments.

                  The terms,  provisions  and conditions of this Warrant may not
be changed, modified or amended in any manner except by an instrument in writing
duly executed by both parties hereto.

13.      Binding Effect; Assignment.

                  (a) This Warrant is not assignable or transferable without the
written consent of the Company, except by operation of law or as provided in (b)
below.

                  (b) This  Warrant  shall not be  transferable  by Holder other
than  to a  "Permitted  Transferee"  (as  defined  below);  provided,  that  any
Permitted Transferee shall be absolutely prohibited from transferring all or any
portion of this Warrant other than to Holder or another

                                       -5-





Permitted  Transferee of Holder;  and provided  further,  that if Holder dies or
becomes  incapacitated,  this Warrant may be exercised by Holder's estate, legal
representative  or  beneficiary,  as the case may be, subject to all other terms
and conditions contained in this Warrant.

                  (c) For purposes of this Warrant,  Permitted Transferees shall
include  only the members of the  Holder's  "immediate  family"  (which shall be
limited to  Holder's  spouse,  children,  and  parents),  and to trusts for such
person's  own benefit  and/or for the  benefit of members of Holder's  immediate
family;  provided,  that such Permitted  Transferees must agree in writing to be
bound  by all of the  terms  of  this  Warrant  to the  same  extent  as  Holder
hereunder,  in form  acceptable  to counsel to the  Company,  including  but not
limited to  restrictions on the exercise of this Warrant and on transfers of the
Shares,  as the case may be, following  exercise of this Warrant,  such that any
Shares so acquired shall be held subject to the terms of this Warrant.

14.      Governing Law.

                  This  Warrant  shall  be  governed  by,  and  interpreted  and
enforced in accordance with, the laws of the State of New York without regard to
principles of choice of law or conflict of laws.

15.      Arbitration of Disputes

                  (a) If any  controversy or dispute arises under,  out of or in
relation to any of the provisions  hereof,  such controversy or dispute shall be
submitted  for  arbitration  in New  York,  New  York  before  a panel  of three
arbitrators,  one of which  shall  be  selected  by the  party  initiating  such
arbitration,  one of which shall be selected by the other party and the third of
which (the  "Third  Arbitrator")  shall be selected  by the two  arbitrators  so
selected; provided, however, that in the event that such other arbitrators shall
not agree on the selection of the Third  Arbitrator,  the Third Arbitrator shall
be selected by the American  Arbitration  Association  located in New York,  New
York. Any dispute or controversy submitted to arbitration in accordance with the
provisions  of this Section 12.10 shall be  determined  by such  arbitrators  in
accordance  with the Commercial  Arbitration  Rules of the American  Arbitration
Association then existing.

                  (b) The arbitrators may award any relief which they shall deem
proper in the circumstances,  without regard to the relief which would otherwise
be  available  to any  party  in a court  of law or  equity  including,  without
limitation, an award of money damages,  specific performance,  injunctive relief
and/or  declaratory  relief,  however,  such an award may not  include  punitive
damages.  The award and  findings of the  arbitrators  shall be  conclusive  and
binding  upon all of the  parties  hereto,  whether  or not all  parties  hereto
participate in the  arbitration  proceeding,  and judgment upon the award may be
entered  in any court of  competent  jurisdiction  upon the  application  of any
party. The parties hereby agree that such courts of competent jurisdiction shall
include,  but not be limited to, the courts located in any jurisdiction in which
the party against whom such judgment is being enforced maintains any assets.

                                       -6-





                  (c) The prevailing  party in the arbitration  proceeding shall
be entitled  to recover  from the other party its  reasonable  attorneys'  fees,
costs and expenses  incurred in the proceeding  and in any subsequent  action to
enforce or collect upon the decision rendered in the arbitration proceeding.

                  (d)  Notwithstanding  the foregoing,  the parties  reserve the
right to seek and obtain injunctive  relief,  whether in the form of a temporary
restraining order, preliminary injunction,  injunction to enforce an arbitration
award,  or other order of similar  import,  from the  federal  and state  courts
located  in New  York,  New York  prior to,  during,  or after  commencement  or
prosecution  or  arbitration  proceedings of the final decision and award of the
arbitrators; provided, however, that such preliminary injunctive relief shall be
subject to final arbitral decisions.

                  (e) Each party hereby consents and agrees that the federal and
state courts located in New York,  New York each shall have  exclusive  personal
jurisdiction and proper venue with respect to any such action seeking injunctive
or similar relief hereunder.  In any dispute between the parties,  neither party
will raise, and each party hereby expressly waives,  any objection or defense to
any such court as an  inconvenient  forum.  Each party  hereby  waives  personal
service of any summons,  complaint or other  process,  which may be delivered by
any of the means permitted for notices under Section 11 hereof.

16.      Descriptive Headings.

                  The  descriptive  headings  of the  several  sections  of this
Warrant are  inserted for  convenience  only and shall not control or affect the
meaning or construction of any of the provisions hereof.


                  WITNESS the seal of the Company and the  signature of its duly
authorized officers.


                                      BENTLEY PHARMACEUTICALS, INC.
[SEAL]


                                      By:   /s/ James R. Murphy  
                                            ------------------------------------
                                                James R. Murphy
                                         Chairman and Chief Executive Officer

Attest:


/s/ Michael D. Price
- ---------------------------
Michael D. Price, Secretary


                                       -7-




                                SUBSCRIPTION FORM

                    (To be Executed by the Registered Holder

                        in order to Exercise the Warrant)


                  The  undersigned  hereby  irrevocably  elects to exercise  the
right to purchase  _____  Shares by this  Warrant  according  to the  conditions
hereof and herewith makes payment of the Purchase Price of such Shares in full.



                                                ________________________________
                                                Signature



                                                ________________________________
                                                Address



Dated: ___________, _____.                      ________________________________
                                                Social Security Number or
                                                Taxpayer's Identification Number


                                       -8-