Exhibit 99.1

	News

	Cephalon Contacts
	Media: Robert Grupp
	610-738-6402
	rgrupp@cephalon.com

	Investors: Chip Merritt
	610-738-6376
	cmerritt@cephalon.com

For immediate release

Cephalon, Inc. Announces Agreement with Mylan Pharmaceuticals Inc.
Regarding Settlement of PROVIGIL® Patent Litigation

Frazer, Pa. – January 10, 2006 – Cephalon, Inc. (Nasdaq: CEPH) announced today that it has entered into an agreement with Mylan Pharmaceuticals Inc. to settle its pending patent infringement dispute in the United States related to PROVIGIL® (modafinil) Tablets [C-IV].

In connection with the settlement, Cephalon will grant Mylan a non-exclusive royalty-bearing right to market and sell a generic version of PROVIGIL in the United States. Mylan’s license will become effective in October 2011, unless Cephalon obtains a pediatric extension for PROVIGIL which would permit entry by Mylan in April 2012. An earlier entry by Mylan may occur based upon the entry of another generic version of PROVIGIL.

The terms of the agreement are confidential, and are subject to review by the U.S. Federal Trade Commission. Financial terms were not disclosed.

The parties will promptly file a dismissal with prejudice with the United States District Court for the District of New Jersey that will conclude all pending litigation between the parties regarding PROVIGIL. This settlement and the previously announced settlements with Teva Pharmaceutical Industries Ltd. and its affiliate and Ranbaxy Laboratories Limited do not affect the status of the ongoing PROVIGIL patent litigations between Cephalon and certain other generic companies that are pending in the U.S. District Court in New Jersey. These lawsuits claim infringement of Cephalon’s U.S. Patent No. RE37,516 (“the ‘516 Patent”) which covers pharmaceutical compositions and methods of treatment with the form of modafinil contained in PROVIGIL. The ‘516 patent expires in October 6, 2014 and may be extended by six months (to April 6, 2015) upon submission of pediatric study data that is acceptable to the U.S. Food and Drug Administration.

SOURCE: Cephalon, Inc. • 41 Moores Road • Frazer, PA 19355 • (610) 344-0200 • Fax (610) 344-0065

Cephalon, Inc.

Founded in 1987, Cephalon, Inc. is an international biopharmaceutical company dedicated to the discovery, development and marketing of innovative products to treat sleep and neurological disorders, cancer and pain. Cephalon currently employs approximately 2,500 people in the United States and Europe. U.S. sites include the company’s headquarters in Frazer, Pennsylvania, and offices, laboratories or manufacturing facilities in West Chester, Pennsylvania, Salt Lake City, Utah, and suburban Minneapolis, Minnesota.

The company currently markets four proprietary products in the United States: PROVIGIL, GABITRIL^® (tiagabine hydrochloride), ACTIQ^® (oral transmucosal fentanyl citrate) [C-II] and TRISENOX^® (arsenic trioxide) injection, and more than 20 products internationally. Full prescribing information for all U.S. products is available at www.cephalon.com or by calling
1-800-896-5855.

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In addition to historical facts or statements of current condition, this press release may contain forward-looking statements. Forward-looking statements provide Cephalon’s current expectations or forecasts of future events. These may include statements regarding the settlement of this litigation, including whether the Federal Trade Commission will approve the terms of such settlement, anticipated scientific progress on its research programs; development of potential pharmaceutical products; interpretation of clinical results; prospects for regulatory approval; manufacturing development and capabilities; market prospects for its products; sales and earnings guidance; and other statements regarding matters that are not historical facts. You may identify some of these forward-looking statements by the use of words in the statements such as “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe” or other words and terms of similar meaning. Cephalon’s performance and financial results could differ materially from those reflected in these forward-looking statements due to general financial, economic, regulatory and political conditions affecting the biotechnology and pharmaceutical industries as well as more specific risks and uncertainties facing Cephalon such as those set forth in its reports on Form 8-K, 10-Q and 10-K filed with the U.S. Securities and Exchange Commission. Given these risks and uncertainties, any or all of these forward-looking statements may prove to be incorrect. Therefore, you should not rely on any such factors or forward-looking statements. Furthermore, Cephalon does not intend to update publicly any forward-looking statement, except as required by law. The Private Securities Litigation Reform Act of 1995 permits this discussion.

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