By Saabira Chaudhuri

Carl Icahn has fired back at Forest Laboratories Inc.'s (FRX) board, writing another harshly worded letter despairing the company's prospects, the latest move in a long-running battle between the drug maker and the billionaire investor.

In his latest salvo, Mr. Icahn said the company is unprepared for the upcoming patent cliff for Alzheimer's drug Namenda, which could be "devastating" for the company, and was "completely unprepared for the Lexapro patent cliff."

In Tuesday's letter, Mr. Icahn said he believes "Forest Labs is in crisis." He added that Chief Executive Howard Solomon will be "wrong again about his currently optimistic view of the company's pipeline," noting that Forest's new pipeline drugs have missed guidance eight out of 11 times in the past four years.

"I strongly believe that this current crisis is the direct result of strategic flaws that have caused a lack of focus and cost inefficiency. At the core of these strategic flaws is the board's decision to allow David Solomon, Howard Solomon's son, to be unduly given so much responsibility over such a critical area as strategic planning," Mr. Icahn said.

He again urged shareholders to vote in favor of his four board nominees.

The skirmish between Forest Labs and Mr. Icahn was revived in June when Mr. Icahn nominated four candidates to Forest's 10-member board and said he was seeking records of the company's actions. In response, Forest said Mr. Icahn's nominees have "significant and obvious conflicts and entanglements that compromise their independence and ability to represent all Forest shareholders."

Last week, Mr. Icahn fired back at Forest, saying that he doesn't believe this board has "the slightest grasp over what constitutes a conflict." Mr. Icahn has, in the past, pointed to companies that improved after his nominees were on their boards, mentioning firms such as Amylin Pharmaceuticals Inc. (AMLN) and Biogen Idec Inc. (BIIB) as examples.

Last week, Forest reported fiscal first-quarter earnings that fell 79% as the pharmaceutical company was hit by sharply lower sales of Lexapro---its antidepressant--which masked growth from some of its other drugs.

Forest Labs last month reduced its fiscal-year earnings guidance because of lower-than-expected branded Lexapro sales and more-aggressive pricing for the authorized generic version of the antidepressant following the March loss of the drug's patent exclusivity.

Forest's shares closed at $34.28 Monday and were inactive in recent premarket trading. The stock is up 13% so far this year.

Write to Saabira Chaudhuri at saabira.chaudhuri@dowjones.com

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