CONNETICS CORP
SC 13D/A, 1998-05-28
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                                Amendment No. 1

                    Under the Securities Exchange Act of 1934

                              Connetics Corporation
                              ---------------------
                                (Name of Issuer)

                                  Common Stock
                         ------------------------------
                         (Title of Class of Securities)

                                   0002078541
                                 --------------
                                 (CUSIP Number)

                                 Eileen McCarthy
                       One Post Office Square, Suite 3800
                                Boston, MA 02109
                                 (617) 482-8020
                         ------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                  May 18, 1998
                         ------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule  because of Rule  13d-1(b)(3)  or (4),  check the following
box:.

         Check the following box if a fee is being paid with this statement:. (A
fee is not required only if the reporting person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto  reporting  beneficial  ownership of five percent or less of such class.
(See Rule 13d-7).

         Note: Six copies of this statement,  including all exhibits,  should be
filed with the  Commission.  See Rule  13d-1(a) for other parties to whom copies
are to be sent.

         * The  remainder of this cover page shall be filled out for a reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934,  as  amended  (the  "Exchange  Act") or  otherwise  subject  to the
liabilities  of that  section  of the  Exchange  Act but shall be subject to all
other provisions of the Exchange Act.

                        (Continued on following page(s))

                               Page 1 of 18 Pages


<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                         Page 2 of 18 Pages

<S>                                                                                     <C>                  <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons. SS or I.R.S. Identification Nos. of Above Persons

       Alta Partners
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      California
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        2,287,163
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   2,287,163


                                                                                (10) Shared Dispositive Power -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,287,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

   
                  13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IA
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 2 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                         Page 3 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Partners, L.P.
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        1,421,668
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   1,421,668


                                                                                (10) Shared Dispositive Power -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,421,668
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 8.5%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  PN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 3 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 4 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta Embarcadero BioPharma, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

        WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

    Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        53,586
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-



                                                                                (9)  Sole Dispositive Power   53,586



                                                                                (10) Shared Dispositive Power -0-



- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  53,586
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  .32%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                   Page 4 of 18 Pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                              Page 5 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Connetics Partners (Alta Bio), LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        811,909
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   811,909


                                                                                (10) Shared Dispositive Power -0-


- -----------------------------------------------------------------------------------------------------------------------
  (11)     Aggregate Amount Beneficially Owned By Each Reporting Person

                  811,909
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 4.86%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 5 of 18 Pages

<PAGE>
<TABLE>
<CAPTION>

CUSIP No. 0002078541                                             13D                              Page 6 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Management, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        1,421,668
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power        865,495


                                                                                (9)  Sole Dispositive Power   1,421,668


                                                                                (10) Shared Dispositive Power   865,495

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,287,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 6 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                             Page 7 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta/Chase BioPharma Management, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power          811,909
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      1,475,254


                                                                                (9)  Sole Dispositive Power     811,909


                                                                                (10) Shared Dispositive Power 1,475,254

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,287,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 7 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                              Page 8 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Jean Deleage
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person
   
                2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 8 of 18 Pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541       13D                                 Page 9 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Garrett Gruener
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

          U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person
   
                  2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 9 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 10 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

      Daniel Janney
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person
   
                  2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 10 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 11 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alix Marduel
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       PF, AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person
   
                  2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 11 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 12 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Guy Nohra
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

          U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person
   
                  2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 12 of 18 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 13 of 18 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Marino Polestra
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
   
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,287,163


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person
   
                  2,287,163
    
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)
   
                 13.67%
    
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 13 of 18 Pages

<PAGE>

Item 1.  Security and Issuer.

                  This  Statement  on  Schedule D relates  to the Common  Stock,
$0.001 par value per share (the "Shares"), of Connetics Corporation,  a Delaware
corporation (the "Company").  The principal executive offices of the Company are
located at 3400 West Bossier Road, Palo Alto, California 94303.


Item 2.           Identity and Background.

   
                  (a) This Statement is filed by Alta BioPharma Partners,  L.P.,
a  Delaware  limited  partnership  ("Alta  BioPharma"),   and  Alta  Embarcadero
BioPharma,  LLC, a Delaware limited liability company  ("Embarcadero  LLC"), and
Connetics  Partners (Alta Bio),  LLC, a Delaware LLC  ("Connetics  Alta Bio") by
virtue  of their  direct  beneficial  ownership  of  Shares,  by Alta  BioPharma
Management   Partners,   LLC,  a  Delaware  limited   liability  company  ("Alta
Management"),  by virtue of being the sole general partner of Alta BioPharma, by
Alta/Chase  BioPharma  Management  LLC, a  Delaware  limited  liability  company
(Alta/Chase  Management)  by  virtue  of being  the sole  managing  director  of
Connetics  Partners  (Alta  Bio),  LLC  and  by  Alta  Partners,   a  California
corporation  ("Alta  Partners"),  by  virtue of being  the  management  advisory
company of these entities. Alta BioPharma,  Embarcadero LLC, Connetics Alta Bio,
Alta  Management,  Alta/Chase  Management  and Alta  Partners  are  collectively
referred to as the  "Reporting  Persons."  Jean Deleage,  Garrett  Gruener,  Dan
Janney,  Alix Marduel,  Guy Nohra and Marino  Polestra (the  "Partners") are the
managing  directors of Alta  Management,  Alta/Chase  Management and officers of
Alta Partners.  By virtue of the  relationships  described above and their roles
with Alta Partners, each of the Partners may be deemed to control Alta Partners,
Alta/Chase Management, Alta Management, and, therefore, may be deemed to possess
indirect beneficial ownership of the Shares held by each entity.  However,  none
of the Partners,  acting alone,  has voting or investment  power with respect to
the Shares  directly  beneficially  held by the entities  and, as a result,  the
Partners disclaim beneficial ownership of the Shares directly beneficially owned
by each entity, except to the extent of their pecuniary interest in each entity.
Embarcadero  LLC is a side  company that makes all  investments  pro rata to the
capital of Alta  BioPharma  with all  allocations  made to its members  based on
paid-in  capital.  Certain of the  Partners are members of  Embarcadero  LLC and
certain members of Embarcadero LLC are affiliates of Alta Partners.
    

                  (b)  The  principal   executive  offices  of  Alta  BioPharma,
Embarcadero LLC, Connetics Alta Bio, Alta Management,  Alta/Chase Management and
Alta  Partners,  and the business  address of each  Partner,  are located at One
Embarcadero Center, Suite 4050, San Francisco, California 94111.

                  (c) Alta Partners  provides  investment  advisory  services to
venture capital firms. Alta BioPharma,  Connetics Alta Bio and Embarcadero LLC's
principal business is acting as venture capital investment vehicles.  Alta/Chase
Management  and Alta  Management's  principal  business  is acting  as  managing
director of Connetics  Alta Bio and Alta  BioPharma,  respectively.  Each of the
Partners' principal business is acting as a managing director of Alta Management
and Alta/Chase Management and as an officer of Alta Partners.

                  (d) None of the Reporting  Persons or, to the knowledge of the
Reporting  Persons,  any of the  Partners,  has  been  convicted  in a  criminal
proceeding  in the past five  years  (excluding  traffic  violations  or similar
misdemeanors).

   
                  (e) During the past five years,  none of the Reporting Persons
or, to the knowledge of the Reporting Persons,  and none of the Partners,  was a
party to a civil  proceeding of a judicial or  administrative  body of competent
jurisdiction  as a result of which such  person was or is subject to a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws of finding any
violation with respect to such laws.
    

                               Page 14 of 18 Pages

<PAGE>

   
                  (f) Alta Partners is a California corporation.  Alta BioPharma
is a  Delaware  limited  partnership.  Embarcadero  LLC  is a  Delaware  limited
liability corporation.  Connetics Alta Bio is a Delaware liability company. Alta
Management and Alta/Chase  Management are Delaware limited liability  companies.
Each of the Partners is a citizen of the United States.
    


Item 3.           Source and Amount of Funds or Other Consideration.

                  The  total  amount  of funds  required  by Alta  BioPharma  to
acquire  the  1,421,668  shares  of  Common  Stock  reported  in Item  5(a)  was
$6,575,214.50,  the total amount of funds required by Embarcadero LLC to acquire
the 53,586 shares of Common Stock reported in Item 5(a) was  $247,835.26 and the
total  amount of funds  required  by  Connetics  Alta Bio to acquire the 811,909
shares of Common Stock reported in Item 5(a) was $3,755,079.12.  Such funds were
provided by each entities' capital available for investment.


Item 4.           Purpose of Transaction.

                  Alta  BioPharma,  Embarcadero  LLC,  and  Connetics  Alta  Bio
acquired the Common Stock reported in Item 5(c) for investment  only.  Depending
upon their  evaluation  of the Company's  investments  and  prospects,  and upon
future developments  (including,  but not limited to, market for the Shares, the
effective yield on the Shares, availability of funds, alternative uses of funds,
and money, stock market and general economic conditions),  each of the Reporting
Persons may from time to time  purchase  the Common  Stock,  dispose of all or a
portion of the Common  Stock that it holds,  or cease  buying or selling  Common
Stock. Any such additional purchases or sales of the Common Stock may be in open
market or privately-negotiated transactions or otherwise.

                  On  April  10,  1998,  Alta  BioPharma,  Embarcadero  LLC  and
Connetics Alta Bio entered into a Common Stock  Purchase  Agreement (the "Common
Stock Purchase  Agreement")  with the Company  pursuant to which Alta BioPharma,
Embarcadero LLC and Connetics Alta Bio acquired, for an aggregate purchase price
of  $10,000,003.88,  a total of 2,162,163  Shares of Common Stock.  The entities
also entered into a Registration Rights Agreement.

Item 5.           Interest in Securities of the Issuer.

   
                  (a) Alta BioPharma is the direct beneficial owner of 1,421,668
shares of Common Stock or approximately 8.5% of the shares deemed outstanding by
the Company  (16,720,846) as of April 17, 1998. Connetics Alta Bio is the direct
beneficial owner of 811,909 shares of Common Stock or approximately 4.86% of the
shares  deemed  outstanding  by the Company  (16,720,846)  as of April 17, 1998.
Embarcadero LLC is the direct  beneficial owner of 53,586 shares of Common Stock
or  approximately   .32%  of  the  shares  deemed  outstanding  by  the  Company
(16,720,846) as of April 17, 1998.
    

                  (b) Each entity has the power to direct the disposition of and
vote the stock held by it. By virtue of the  relationships  previously  reported
under Item 2 of this Statement, Alta Management,  Alta/Chase Management and Alta
Partners may be deemed to have indirect beneficial ownership of the shares owned
by such entities.

                  (c) On April 10, 1998 Alta BioPharma,  Connetics Alta Bio, and
Embarcadero  LLC acquired the Shares  described in Item 3 of this Statement in a
privately negotiated transaction with the Company for aggregate consideration of
$6,325,668, $3,446,846 and $227,489.88, respectively.

                  On May 18,  1998  Alta  BioPharma,  Connetics  Alta  Bio,  and
Embarcadero  LLC  acquired  an  additional   53,956  66,645  and  4,399  Shares,
respectively, in a privately negotiated transaction with certain shareholders of
the  Company  for  aggregate  consideration  of  $249,546.50,   $308,233.12  and
$20,345.38, respectively.

Except as set forth above,  neither the Reporting  Persons nor the Partners have
effected any transaction in the Shares during the past 60 days.

                              Page 15 of 18 Pages

<PAGE>

                  (d) Alta  BioPharma,  Connetics Alta Bio and  Embarcadero  LLC
each have the right to receive  dividends  and proceeds  from the sale of Common
Stock  held by it.  By virtue of the  relationships  reported  in Item 2 of this
Statement.  Alta  Management,  Alta/Chase  Management  and Alta  Partners may be
deemed to have the power to direct the  receipt of  dividends  and the  proceeds
from the sale of the Common Stock held by each entity.

                  (e)      Not Applicable


Item 6.           Contracts, Arrangements,  Understandings or Relationships with
Respect to Securities of the Issuer.

                  The  Connetics  Corporation  Common Stock  Purchase  Agreement
dated April 10, 1998 and The Connetics Corporation Registration Rights Agreement
dated April 10, 1998 are hereby incorporated in its entirety by this reference.

Item 7.           Material to be Filed as Exhibits.

                  Exhibit A:  Joint Filing Statement

                  Exhibit  B:  Connetics   Corporation   Common  Stock  Purchase
                  Agreement  dated April 10, 1998, as previously  submitted with
                  the Schedule 13D filed April 20, 1998 and incorporated  herein
                  by reference.

                  Exhibit C: Connetics Corporation Registration Rights Agreement
                  dated  April  10,  1998,  as  previously  submitted  with  the
                  Schedule 13D filed April 20, 1998 and  incorporated  herein by
                  reference.

                  Exhibit  D:  Alta  BioPharma   Partners  Limited   Partnership
                  Management   Rights   Agreement   dated  April  10,  1998,  as
                  previously  submitted  with the  Schedule  13D filed April 20,
                  1998 and incorporated herein by reference.


                              Page 16 of 18 Pages

<PAGE>

Signature

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


Date:  May 21, 1998

Alta Partners                               Alta BioPharma Partners, L.P.

By:           /s/ Eileen McCarthy       By:  Alta BioPharma Management, LLC
     -------------------------------         Its General Partner
     Eileen McCarthy, Vice President         


Alta BioPharma Management, LLC          By:        /s/ Eileen McCarthy
                                              --------------------------------
                                              Eileen McCarthy, Member

By:           /s/ Eileen McCarthy       Connetics Partners (Alta Bio), LLC
     -------------------------------    
     Eileen McCarthy, Member
                                        By:   Alta/Chase BioPharma Management,
Alta/Chase BioPharma Management, LLC           LLC Its Managing Member        
                                                                              
By:           /s/ Eileen McCarthy       By:        /s/ Eileen McCarthy        
     -------------------------------          --------------------------------
     Eileen McCarthy, Member                  Eileen McCarthy, Member         
                                        
Alta Embarcadero BioPharma, LLC


By:           /s/ Eileen McCarthy
     -------------------------------  
     Eileen McCarthy, Member


         /s/ Jean Deleage                        /s/ Guy Nohra
- ------------------------------          --------------------------------
Jean Deleage                            Guy Nohra

         /s/ Garrett Gruener                     /s/ Marino Polestra
- ------------------------------          --------------------------------
Garrett Gruener                         Marino Polestra

         /s/ Daniel Janney                       /s/ Alix Marduel
- ------------------------------          --------------------------------
Daniel Janney                           Alix Marduel

                               Page 17 of 18 Pages

<PAGE>

                                    EXHIBIT A

                             Joint Filing Statement

         We, the  undersigned,  hereby  express our agreement  that the attached
Schedule 13D is filed on behalf of each of us.


Date:  May 21, 1998

Alta Partners                              Alta BioPharma Partners, L.P.

By:          /s/ Eileen McCarthy      By:  Alta BioPharma Management, 
    -------------------------------        LLC Its General Partner
    Eileen McCarthy, Vice President        

Alta BioPharma Management, LLC             By:           /s/ Eileen McCarthy
                                                -------------------------------
                                                Eileen McCarthy, Member

By:          /s/ Eileen McCarthy      Connetics Partners (Alta Bio), LLC
    -------------------------------
    Eileen McCarthy, Member
                                           By:  Alta/Chase BioPharma Management,
Alta/Chase BioPharma Management, LLC            LLC Its Managing Member
                                                
By:          /s/ Eileen McCarthy           By:           /s/ Eileen McCarthy
    ------------------------------             --------------------------------
    Eileen McCarthy, Member                    Eileen McCarthy, Member

Alta Embarcadero BioPharma, LLC


By:          /s/ Eileen McCarthy
    ------------------------------ 
    Eileen McCarthy, Member


         /s/ Jean Deleage                           /s/ Guy Nohra
- ------------------------------             --------------------------------
Jean Deleage                               Guy Nohra

         /s/ Garrett Gruener                        /s/ Marino Polestra
- ------------------------------             --------------------------------
Garrett Gruener                            Marino Polestra

         /s/ Daniel Janney                          /s/ Alix Marduel
- ------------------------------             --------------------------------
Daniel Janney                              Alix Marduel


                              Page 18 of 18 Pages



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