Exhibit 4 LOCK-UP LETTER AGREEMENT LEHMAN BROTHERS INC. As Representative of the Several underwriters c/o LEHMAN BROTHERS INC. 745 Seventh Avenue New York, NY 10019 Ladies and Gentlemen: The undersigned understands that you and certain other firms...Lock-Up Agreement • August 1st, 2003 • Durus Capital Management • Pharmaceutical preparations
The undersigned understands that you and certain other firms propose to enter into an Underwriting Agreement (the "Underwriting Agreement") providing for the purchase by you and such other firms (the "Underwriters") of shares (the "Shares") of Common Stock, par value $.001 per share (the "Common Stock"), of Esperion Therapeutics, Inc. (the "Company") and that the Underwriters propose to reoffer the Shares to the public (the "Offering").
