FILE NO: 1-10581
- --------------------------------------------------------------------------------


                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 8-A
                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(B) OR (G) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



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



           DELAWARE                                     59-1513162
  (State or other jurisdiction           (I.R.S. Employer Identification Number)
of incorporation or organization


      65 LAFAYETTE ROAD, 3RD FLOOR,                       03862
      NORTH HAMPTON, NEW HAMPSHIRE                      (Zip Code)
(Address of principal executive offices)


        Securities to be registered pursuant to Section 12(b) of the Act:
                                      NONE

    Title of each class                          Name of each exchange on which
   to be so registered:                         each class is to be registered:

         If this  form  relates  to the  registration  of a class of  securities
pursuant  to Section  12(b) of the  Exchange  Act and is  effective  pursuant to
General Instruction A.(c), check the following box. |_|

         If this  form  relates  to the  registration  of a class of  securities
pursuant  to Section  12(g) of the  Exchange  Act and is  effective  pursuant to
General Instruction A.(d), check the following box. |X|

 Securities Act registration statement file number to which this form relates:
                           REGISTRATION NO. 33-17201

        Securities to be registered pursuant to Section 12(g) of the Act:

                         PREFERRED STOCK PURCHASE RIGHTS
- --------------------------------------------------------------------------------
                                (Title of Class)


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



ITEM 1.  DESCRIPTION OF SECURITIES TO BE REGISTERED.


         On   December   22,   1999,   the  Board  of   Directors   of   Bentley
Pharmaceuticals,  Inc. (the "Company") declared a dividend of one Right for each
outstanding  share of the Company's Common Stock, par value $0.02 per share (the
"Common Stock"),  to stockholders of record at the close of business on December
27,  1999.  Each Right,  when  exercisable,  entitles the  registered  holder to
purchase  from the  Company  one  one-thousandth  of a share of  Series A Junior
Participating  Preferred  Stock,  par  value  $1.00  per  share  (the  "Series A
Preferred  Stock"),  at a Purchase Price of $16.50 per one  one-thousandth  of a
share of Series A Preferred  Stock,  subject to adjustment.  The description and
terms of the Rights are set forth in a Rights Agreement (the "Rights Agreement")
dated as of December 22, 1999 between the Company and American  Stock Transfer &
Trust Company, as Rights Agent.

         Initially, the Rights will be attached to all Common Stock certificates
representing  shares then outstanding,  and no separate Rights Certificates will
be distributed. A Distribution Date will occur and the Rights will separate from
the  Common  Stock  upon  the  earlier  of:  (i)  10  days  following  a  public
announcement  that a person or group of  affiliated  or  associated  persons (an
"Acquiring Person") has acquired,  or obtained the right to acquire,  beneficial
ownership  of 15% or more of the shares of Common  Stock then  outstanding  (the
"Stock  Acquisition  Date"), or (ii) 10 business days following the commencement
of a tender  offer or  exchange  offer  that  would  result in a person or group
beneficially  owning  15% or more of such  outstanding  shares of  Common  Stock
(unless  such  tender  offer or  exchange  offer is an all  cash  offer  for all
outstanding  shares  of  Common  Stock  which  a  majority  of the  unaffiliated
directors  who are not officers of the Company  determine to be at a price which
is fair to all  stockholders  and otherwise in the best interests of the Company
and its  stockholders).  The definition of "Acquiring  Person"  excludes Russell
Cleveland,  Michael  McGovern,  Renaissance  U.S.  Growth and Income  Trust PLC,
Renaissance  U.S. Growth and Income Fund III, Inc. and each of their  respective
affiliates  and  associates,  unless any of such  persons,  together  with their
affiliates  and  associates,  increases  by 15% or  more  his or its  beneficial
ownership of the shares of Common Stock outstanding from the number of shares of
Common  Stock  beneficially  owned  on  December  22,  1999.  Under  the  Rights
Agreement,  for purposes of calculating percentages of Common Stock outstanding,
shares of Common  Stock  outstanding  shall  include all shares of Common  Stock
deemed to be  beneficially  owned by a person and its affiliates and associates,
even if not actually then outstanding.

         Until the  Distribution  Date,  (i) the Rights will be evidenced by the
Common Stock certificates and will be transferred with and only with such Common
Stock certificates, (ii) new Common Stock certificates issued after December 27,
1999 will contain a notation incorporating the Rights Agreement by reference and
(iii)  the  surrender  for  transfer  of  any   certificates  for  Common  Stock
outstanding will also constitute the transfer of the Rights  associated with the
Common Stock represented by such certificate.

         The Rights are not  exercisable  until the  Distribution  Date and will
expire at the close of business on December 21, 2004, unless earlier redeemed by
the  Company as  described  below.  At no time will the  Rights  have any voting
power.

         As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to  holders  of  record  of the  Common  Stock as of the close of
business  on  the  Distribution  Date  and,  thereafter,   the  separate  Rights
Certificates alone will represent the Rights. Except (i) with respect to certain
shares of Common Stock issued or sold  pursuant to the exercise of stock options
or  under  any  employee  plan or  arrangement,  granted  or  awarded  as of the
Distribution  Date,  or upon the  exercise,  conversion  or  exchange of certain
securities  of the  Company,  or (ii) as  otherwise  determined  by the Board of
Directors,

                                      -2-



only shares of Common Stock issued prior to the Distribution Date will be issued
with Rights.

          In the event that an Acquiring  Person becomes the beneficial owner of
15% or more of the then  outstanding  shares of Common Stock (except pursuant to
an all cash tender or exchange offer for all outstanding  shares of Common Stock
which a majority  of the  unaffiliated  directors  who are not  officers  of the
Company  determine  to be at a  price  which  is fair  to all  stockholders  and
otherwise  in the  best  interests  of  the  Company  and  its  stockholders  (a
"Qualifying  Offer")),  each holder of a Right will thereafter have the right to
receive,  upon  payment of the  Purchase  Price,  Common  Stock (or,  in certain
circumstances, cash, property or other securities of the Company) having a value
(based on a formula  set forth in the Rights  Agreement)  equal to two times the
Purchase Price of the Right. Notwithstanding any of the foregoing, following the
occurrence of the event set forth in this paragraph (the "Flip-in  Event"),  all
Rights  that are,  or  (under  certain  circumstances  specified  in the  Rights
Agreement)  were,  beneficially  owned by an  Acquiring  Person  (or by  certain
related  parties) shall be null and void.  However,  Rights are not  exercisable
following the  occurrence of the Flip-in Event until such time as the Rights are
no longer redeemable by the Company as set forth below.

         For example,  at a Purchase  Price of $16.50 per Right,  each Right not
owned by an Acquiring  Person (or by certain  related  parties of such Acquiring
Person)  following a Flip-in Event would  entitle its holder to purchase  $33.00
worth of Common  Stock  (or  other  consideration,  as noted  above)  determined
pursuant to a formula set forth in the Rights  Agreement,  for $16.50.  Assuming
that the Common Stock had a per share value of $5.50 at such time (as determined
pursuant to such  formula),  the holder of each valid Right would be entitled to
purchase 6 shares of Common Stock for $16.50.

         In the event that, at any time  following the Stock  Acquisition  Date,
(i)  the  Company  is  acquired  in  a  merger  or  other  business  combination
transaction in which the Company is not the surviving corporation or in which it
is the surviving corporation but its Common Stock is changed or exchanged (other
than a merger consummated pursuant to a Qualifying Offer), or (ii) more than 50%
of the Company's assets or earning power is sold or transferred,  each holder of
a Right  (except  Rights which  previously  have been voided as set forth above)
shall, after the expiration of the redemption period referred to below, have the
right to  receive,  upon  payment of the  Purchase  Price,  common  stock of the
acquiring  company  having a value equal to two times the  Purchase  Price.  The
events set forth in this paragraph and the Flip-in Event described in the second
preceding paragraph are referred to as the "Triggering Events."

         The Purchase Price payable,  and the number of one one-thousandths of a
share of Series A Preferred Stock or other securities or property issuable, upon
exercise  of the Rights are subject to  adjustment  from time to time to prevent
dilution (i) in the event of a stock dividend on, or a subdivision,  combination
or  reclassification  of, the Series A Preferred  Stock,  (ii) if holders of the
Series A Preferred Stock are granted certain rights or warrants to subscribe for
Series A  Preferred  Stock or  convertible  securities  at less than the current
market price of the Series A Preferred  Stock, or (iii) upon the distribution to
holders of the Series A Preferred  Stock of evidences of  indebtedness or assets
(excluding  regular  quarterly  cash  dividends  out of the earnings or retained
earnings of the Company) or of subscription rights or warrants (other than those
referred to above).

         With certain  exceptions,  no anti-dilution  adjustment in the Purchase
Price will be required until cumulative adjustments amount to at least 1% of the
Purchase  Price.  No fractional  shares of Series A Preferred  Stock (other than
fractions of one  one-thousandth of a share, or integral multiples thereof) will
be issued and, in lieu thereof,  an adjustment in cash will be made based on the
market  price of the Series A Preferred  Stock on the last trading date prior to
the date of exercise.

                                      -3-


         At any time until ten (10) days following the Stock  Acquisition  Date,
as such period may be  extended  or  shortened  by the Board of  Directors,  the
Company  may redeem the Rights in whole,  but not in part,  at a price of $0.001
per Right (payable in cash, shares of Common Stock or other consideration deemed
appropriate by the Board of Directors). Immediately upon the action of the Board
of Directors  ordering  redemption of the Rights,  the Rights will terminate and
the only right of the holders of Rights will be to receive the $0.001 redemption
price.

         Until a Right is exercised,  the holder thereof,  as such, will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive  dividends.  While the distribution of the Rights will not
be taxable to stockholders or to the Company,  stockholders may,  depending upon
the circumstances,  recognize taxable income in the event that the Rights become
exercisable for shares of Common Stock (or other  consideration)  of the Company
or for shares of common stock of the  acquiring  company as set forth above,  or
are redeemed as provided above.

         Other than certain provisions  relating to the principal economic terms
of the Rights,  any of the provisions of the Rights  Agreement may be amended by
the Board of Directors of the Company prior to the Distribution  Date. After the
Distribution  Date, the provisions of the Rights Agreement may be amended by the
Board in order to cure any  ambiguity,  to make changes  which do not  adversely
affect the interests of holders of Rights (other than an Acquiring  Person or an
affiliate or associate thereof), or to shorten or lengthen any time period under
the Rights Agreement;  provided,  however,  that no amendment to adjust the time
period  governing  redemption  shall be made at such time as the  Rights are not
redeemable.

         The Rights have certain anti-takeover  effects.  Exercise of the Rights
will cause  substantial  dilution to a person or group that  attempts to acquire
the  Company on terms not  approved by the  Company's  Board of  Directors.  The
existence  of Rights,  however,  should not affect an offer at a price  which is
fair to all  stockholders and otherwise in the best interests of the Company and
its stockholders as determined by the Board of Directors.  The Rights should not
interfere with any merger or other business combination approved by the Board of
Directors since the Board of Directors may, at its option, at any time until ten
days  following  the Stock  Acquisition  Date, as such period may be extended or
shortened  by the Board of  Directors,  redeem  all but not less than all of the
then outstanding Rights at the $0.001 redemption price.

         The Rights  Agreement,  dated as of  December  22,  1999,  between  the
Company and American Stock Transfer & Trust Company, as Rights Agent, specifying
the  term  of the  Rights  is  included  as  Exhibit  1 to  this  filing  and is
incorporated  herein by reference.  The foregoing  description  of the Rights is
qualified in its entirety by reference to such exhibit.

ITEM 2.  EXHIBITS.

         1.       Rights  Agreement,  dated as of  December  22,  1999,  between
                  Bentley  Pharmaceuticals,  Inc. and American  Stock Transfer &
                  Trust Company,  as Rights Agent,  including the form of Rights
                  Certificate as Exhibit B thereto (incorporated by reference to
                  Exhibit 4.1 to the Company's  Current Report on Form 8-K filed
                  on December 27, 1999 (date of earliest event reported December
                  22, 1999).

                                      -4-



                                    SIGNATURE

              Pursuant  to the  requirements  of  Section  12 of the  Securities
     Exchange  Act of 1934,  as  amended,  the  Registrant  has duly caused this
     registration  statement  to be  signed on its  behalf  by the  undersigned,
     thereto duly authorized.


     Date: December 27, 1999                      BENTLEY PHARMACEUTICALS, INC.



                                                  By: /s/ Michael D. Price
                                                     ------------------------
                                                      Michael D. Price
                                                      Secretary and Treasurer

                                      -5-