Washington, D.C. 20549

                                  SCHEDULE 13G
                                  Rule 13d-102

                   Under the Securities Exchange Act of 1934
                              (Amendment No. __)*

                         Regeneron Pharmaceuticals Inc.
                                (Name of Issuer)

                         (Title of Class of Securities)

                                 (CUSIP Number)

            (Date of Event which Requires Filing of this Statement)

      Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:
                               |_| Rule 13d-1 (b)
                               |X| Rule 13d-1 (c)
                               |_| Rule 13d-1 (d)

      * 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 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 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

Page 1 of 4 Pages

CUSIP No. 75886F107
(1) Names and I.R.S. Identification Nos.(entities only) of reporting persons.

    Novartis Pharma AG
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
(3) SEC use only.

(4) Citizenship or place of organization.

Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:

    (6) Shared voting power:

    (7) Sole dispositive power:

    (8) Shared dispositive power:

(9) Aggregate amount beneficially owned by each reporting person.

(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).
(11) Percent of class represented by amount in Row 9.

(12) Type of reporting person (see instructions).


Page 2 of 4 Pages

Item 1(a). Name of Issuer:

           Regeneron Pharmaceuticals Inc.

Item 1(b). Address of Issuer's Principal Executive Offices:

           777 Old Saw Mill River Road
           Tarrytown, NY 10591-6707

Item 2(a). Name of Person Filing:

           Novartis Pharma AG

Item 2(b). Address or Principal Business Office or, If None, Residence:

           Lichtstrasse 35
           CH-4002, Basel

Item 2(c). Citizenship:


Item 2(d). Title of Class of Securities:


Item 2(e). CUSIP No.:


Item 3. If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or
        (c), Check Whether the Person Filing is a:

        (a) |_| Broker or dealer registered under section 15 of the Act
                (15 U.S.C. 78o).

        (b) |_| Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

        (c) |_| Insurance company as defined in section 3(a)(19) of the Act
                (15 U.S.C. 78c).

        (d) |_| Investment company registered under section 8 of the Investment
                Company Act of 1940 (15 U.S.C 80a-8).

        (e) |_| An investment adviser in accordance with
                ss. 240.13d-1(b)(1)(ii)(E);

        (f) |_| An employee benefit plan or endowment fund in accordance with

        (g) |_| A parent holding company or control person in accordance with
                ss.240.13d- 1(b)(1)(ii)(G);

        (h) |_| A savings associations as defined in Section 3(b) of the
                Federal Deposit Insurance Act (12 U.S.C. 1813);

        (i) |_| A church plan that is excluded from the definition of an
                investment company under section 3(c)(14) of the Investment
                Company Act of 1940 (15 U.S.C. 80a-3);

        (j) |_| Group, in accordance with ss. 240.13d-1(b)(1)(ii)(J).

        If this statement is filed pursuant to Rule 13d-1(c),
        check this box. |X|

Item 4. Ownership

    (a) Amount beneficially owned:

    (b) Percent of class:

    (c) Number of shares as to which such person has:
        (i)   Sole power to direct the vote

        (ii)  Shared power to direct the vote

        (iii) Sole power to dispose or direct the disposition of

        (iv)  Shared power to dispose or direct the disposition of

Item 5. Ownership of 5 Percent or Less of a Class.

        If this statement is being filed to report the fact that as of the date
        hereof the reporting person has ceased to be the  beneficial owner of
        more than 5 percent of the class of  securities, check the following |_|

Item 6. Ownership of More than 5 Percent on Behalf of Another Person.

        Not Applicable

Item 7. Identification and Classification of the Subsidiary Which Acquired the
        Security Being Reported on by the Parent Holding Company or Control

        Not Applicable

Item 8. Identification and Classification of Members of the Group.

        Not Applicable

Item 9. Notice of Dissolution of Group.

        Not Applicable

Item 10. Certifications

         By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were not acquired and are not
         held for the purpose of or with the effect of changing or influencing
         the control of the issuer of the securities and were not acquired and
         are not held in connection with or as a participant in any transaction
         having that purpose or effect.

Page 3 of 4 Pages

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.

                                      Novartis Pharma AG

Date: 04/07/2003                      /s/ Joseph E. Mamie
                                      Name:  Joseph E. Mamie
                                      Title: Head of Operational Treasury

                                      Novartis Pharma AG

Date: 04/07/2003                      /s/ Kimberly Urdahl
                                      Name:  Kimberly Urdahl
                                      Title: Senior Legal Counsel

The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, Provided, however, That a power of attorney for this purpose
which is already on file with the Commission may be incor porated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

ATTENTION: Intentional misstatements or omissions of fact constitute Federal
criminal violations (see 18 U.S.C. 1001). (Secs. 3(b), 13(d)(1), 13(d)(2),
13(d)(5),  13(d)(6), 13(g)(1), 13(g)(2), 13(g)(5), 23, 48 Stat. 882, 894, 901;
sec. 203(a),  49 Stat. 704; sec. 8, 49 Stat. 1379; sec. 10, 78 Stat. 88a; sec.
2, 82 Stat. 454;  secs. 1, 2, 84 Stat. 1497; secs. 3, 10, 18, 89 Stat. 97, 119,
155; secs. 202, 203,  91 Stat. 1494, 1498, 1499; (15 U.S.C. 78c(b), 78m(d)(1),
78m(d)(2), 78m(d)(5),  78m(d)(6), 78m(g)(1), 78m(g)(2), 78m(g)(5), 78w)) [43 FR
18499, Apr. 28, 1978,  as amended at 43 FR 55756, Nov. 29, 1978; 44 FR 2148,
Jan. 9, 1979; 44 FR 11751,  Mar. 2, 1979; 61 FR 49959, Sept. 24, 1996; 62 FR
35340, July 1, 1997; 63 FR 2867,  Jan. 16, 1998; 63 FR 15287, Mar. 31, 1998]

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