**UNITED STATES  SECURITIES AND EXCHANGE COMMISSION  WASHINGTON, D.C. 20549****SCHEDULE 13G****UNDER THE SECURITIES EXCHANGE ACT OF 1934    (Amendment No. )*****ESPERION THERAPEUTICS, INC.**  (Name of Issuer)  Common Stock, $0.001 par value per share   (Title of Class of Securities)  29664W 10 5  (CUSIP Number)  December 31, 2013  (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)  |  | Rule 13d-1(c)  |X| 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).

CUSIP No.  29664W 10 5  --------------------------------------------------------------------------------  1) Names of Reporting  Persons. PFIZER INC.  I.R.S. Identification Nos. of Above Persons (entities only) 13-5315170  --------------------------------------------------------------------------------  2) Check the Appropriate  Box if a Member of a Group (See Instructions)  (a) |_|  (b) |_|  --------------------------------------------------------------------------------  3) SEC Use Only  --------------------------------------------------------------------------------  4) Citizenship or Place  of Organization  Delaware  --------------------------------------------------------------------------------

| NUMBER OF        SHARES         BENEFICIALLY         OWNED BY EACH    REPORTING        PERSON WITH: | 5. Sole Voting Power      966,218 |
|-----------------------------------------------------------------------------------------------------|---------------------------------------------|
| 6. Shared Voting Power    -0-                                                                       |
| 7. Sole Dispositive    Power 966,218                                                           |
| 8. Shared Dispositive    Power -0-                                                                  |

--------------------------------------------------------------------------------  9) Aggregate Amount  Beneficially Owned by Each Reporting Person 966,218   10) Check if the  Aggregate Amount in Row (9) Excludes Certain Shares  (See Instructions) |_|  11) Percent of Class  Represented by Amount in Item 9   6.29%  12) Type of Reporting  Person (See Instructions)   CO     ITEM 1.  (A) NAME OF ISSUER: Esperion Therapeutics, Inc.  (B) ADDRESS OF ISSUER'S  PRINCIPAL EXECUTIVE OFFICE:    46701 Commerce Center Drive, Plymouth, Michigan, 48170  ITEM 2.  (A) NAME OF PERSONS  FILING: PFIZER INC.  (B) ADDRESS OF PRINCIPAL  BUSINESS OFFICE OR IF NONE, RESIDENCE:  235 E. 42nd Street, New York, NY 10017  (C) CITIZENSHIP:  DELAWARE, U.S.A.  (D) TITLE OF CLASS OF  SECURITIES: COMMON STOCK  (E) CUSIP NUMBER:  29664W 10 5  ITEM 3.   Not applicable.   ITEM 4. OWNERSHIP.  (a) Amount beneficially  owned: 966,218   (b) Percent of class: 6.29%  (c) Number of shares as  to which the person has:   (i) Sole power to vote  or to direct the vote:  966,218  (ii) Shared power to  vote or to direct the vote: 0  (iii) Sole power to  dispose or to direct the disposition of:  966,218   (iv) Shared power to  dispose or to direct the disposition of:    0

ITEM 5. OWNERSHIP OF  FIVE PERCENT OR LESS OF A CLASS  Not applicable.  ITEM 6. OWNERSHIP OF  MORE THAN FIVE 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  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. CERTIFICATION.  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.

   **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.  Dated: February 13, 2014  PFIZER INC.   By: /s/ Susan Grant  Name: Susan Grant  Title: Assistant Secretary