CONNETICS CORP
SC 13D/A, 2000-02-11
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                                 Amendment No. 3

                    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)

                                February 1, 2000
                   -------------------------------------------
             (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 19 Pages


<PAGE>

<TABLE>
<CAPTION>

CUSIP No. 0002078541                                13D                                Page 2 of 19 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 Powe           845,720
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     845,720


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 2 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 3 of 19 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          525,688
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     525,688


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  525,688
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  1.95%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 3 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 4 of 19 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

      California
- ---------------------------------------------------------------------------------------------------------
Number Of Shares                                              (7)      Sole Voting Powe           19,814
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     19,814


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  19,814
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  .07%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 4 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 5 of 19 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          300,218
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     300,218


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  300,218
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  1.11%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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


                                            Page 5 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 6 of 19 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          525,688
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     525,688


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  525,688
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  1.95%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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


                                            Page 6 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 7 of 19 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          300,218
Beneficially Owned
By Each Reporting
Person With                                                   (8)      Shared Voting Power        -0-


                                                              (9)      Sole Dispositive Power     300,218


                                                              (10)     Shared Dispositive Power   -0-


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  300,218
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  1.11%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                             Page 7 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 8 of 19 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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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


                                            Page 8 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                Page 9 of 19 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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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


                                            Page 9 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                               Page 10 of 19 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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 10 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                               Page 11 of 19 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*

      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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 11 of 19 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                               Page 12 of 19 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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (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 19 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        845,720


                                                              (9)      Sole Dispositive Power     -0-


                                                              (10)     Shared Dispositive Power   845,720


 (11)    Aggregate Amount Beneficially Owned By Each Reporting Person

                  845,720
- ---------------------------------------------------------------------------------------------------------
 (12)    Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

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

                  3.14%
- ---------------------------------------------------------------------------------------------------------
 (14)    Type Of Reporting Person

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

                                            Page 13 of 19 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 Bayshore 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 California 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 19 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  limited  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.

                  Not applicable.

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.  On May 18,  1998,  Alta
BioPharma,  Embarcadero  LLC and Connetics  Alta Bio acquired,  for an aggregate
purchase  price of  $578,125,  a total of  125,000  Shares of Common  Stock . On
November  23, 1998,  Alta  BioPharma,  Embarcadero  LLC and  Connetics  Alta Bio
acquired,  for an aggregate  purchase  price of  $1,000,000,  a total of 250,000
Shares of Common  Stock.  The entities also entered into a  Registration  Rights
Agreement.

                  On  February  1, 2000,  Alta  BioPharma,  Embarcadero  LLC and
Connetics Alta Bio made in-kind  distributions of 1,051,377,  39,629 and 600,437
shares of Common  Stock,  respectively,  to their  limited  partners  or members
without  consideration  pursuant  to  the  terms  of  their  respective  limited
partnership or operating agreements.

Item 5.           Interest in Securities of the Issuer.

                  (a) Alta BioPharma is the direct  beneficial  owner of 525,688
shares of Common Stock or approximately  1.95% of the shares deemed  outstanding
by the Company  (26,950,424) as of December 31, 1999.  Connetics Alta Bio is the
direct beneficial owner of 300,218 shares of Common Stock or approximately 1.11%
of the shares deemed outstanding by the Company  (26,950,424) as of December 31,
1999.  Embarcadero LLC is the direct beneficial owner of 19,814 shares of Common
Stock or  approximately  .07% of the shares  deemed  outstanding  by the Company
(26,950,424) as of December 31, 1999.

                  (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.


                               Page 15 of 19 Pages

<PAGE>

                           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.

                           On November 23, 1998 Alta  BioPharma,  Connetics Alta
Bio,  and  Embarcadero  LLC  acquired an  additional  155,397,  88,746 and 5,857
Shares,  respectively,  in  a  privately  negotiated  transaction  with  certain
shareholders of the Company for aggregate  consideration  of $621,588,  $354,984
and $23,428, respectively.

                           On February 1, 2000,  Alta  BioPharma made an in-kind
distribution of 1,051,377 shares of Common Stock to its limited partners without
consideration  pursuant to the terms of its limited  partnership  agreement.  On
February 1, 2000,  Embarcadero LLC made an in-kind distribution of 39,629 shares
of Common Stock to its members  without  consideration  pursuant to the terms of
its operating agreement. On February 1, 2000, Connetics Alta Bio made an in-kind
distribution   of  600,437  shares  of  Common  Stock  to  its  members  without
consideration pursuant to the terms of its operating agreement.

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

                  (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) On February 1, 2000,  Reporting  Persons  ceased to be the
beneficial owners of more than five percent of the class of securities  reported
herein.

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  their  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 D 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 D 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 D filed April 20, 1998
                  and incorporated herein by reference.


                               Page 16 of 19 Pages

<PAGE>

                  Exhibit E: Form of Connetics  Corporation  Registration Rights
                  Agreement dated November 20, 1998 and  incorporated  herein by
                  reference.


                               Page 17 of 19 Pages

<PAGE>

<TABLE>
                  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.
<CAPTION>

Date:  February 10, 2000
<S>               <C>                                         <C>
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, LLC
Alta/Chase BioPharma Management, 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

</TABLE>

                                             Page 18 of 19 Pages

<PAGE>

                                    EXHIBIT A

                             Joint Filing Statement
<TABLE>
         We, the  undersigned,  hereby  express our agreement  that the attached
Schedule 13D is filed on behalf of each of us.
<CAPTION>
Date:  February 10, 2000
<S>                                                           <C>
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, LLC
Alta/Chase BioPharma Management, 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
</TABLE>


                                             Page 19 of 19 Pages




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