UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported) June 13, 2011

Cephalon, Inc.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code (610) 344-0200

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01               Other Information.

On June 13, 2011, Teva Pharmaceutical Industries Ltd. (“Teva”) and Cephalon, Inc. (the “Company”) announced that, as expected, each party has received a request for additional information (commonly referred to as a “second request”) from the U.S. Federal Trade Commission (“FTC”) in connection with Teva’s pending acquisition of the Company. The parties have been cooperating with the FTC staff since shortly after the announcement of the transaction and intend to continue to cooperate with the FTC to obtain HSR clearance as promptly as possible.

The effect of the second request is to extend the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (“HSR”) waiting period until thirty days after the parties have substantially complied with the request, unless that period is terminated sooner by the FTC. The companies continue to expect that the transaction will be completed in the third quarter of 2011, following completion of the HSR clearance process, the clearance by the European Commission under the EC Merger Regulation, as well as the approval of the Company’s stockholders.

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

3