Forest Laboratories Inc. (FRX) said its board has adopted a shareholder-rights plan after activist shareholder Carl Icahn recently increased his ownership stake in the company.

A rights plan, also known as a poison pill, often is used to thwart potential hostile-takeover offers by giving other shareholders the right to buy more shares at a discount if one shareholder buys a certain percentage of the company's stock.

The drug maker said the rights plan is designed to ensure the company's shareholders receive fair treatment in the event of any proposed takeover as well as to "guard against abusive tactics" to gain control of the company without paying shareholders a premium for that control.

"After concluding a second proxy contest during which he repeatedly--and erroneously--disparaged Forest's business model and growth prospects, Mr. Icahn increased his already-significant position in Forest with rapid open-market purchases," said Chairman and Chief Executive Howard Solomon.

Mr. Icahn, who recently boosted his stake in the company to 11%, wasn't immediately available for comment.

The rights plan would be triggered if a person or group acquires 12% or more of the company's stock, or 20% in the case of a 13G institutional investor. Each right under the plan entitles stockholders to buy one one-thousandth of a share of a new series of junior participating preferred stock at an exercise price of $100.

If Forest Labs is acquired in a merger or other deal after a person has acquired 12% or more of the company's stock, or an institutional investor has acquired 20% or more of the company's stock, each right will allow its holder to purchase a number of the acquiring company's common shares having a market value of twice the exercise price. The acquiring person won't be entitled to exercise these rights, the company said.

The plan will expire in 12 months unless ratified by shareholders.

Mr. Icahn in June nominated four candidates to Forest's 10-member board, though only one of those candidates won a seat after the company's annual shareholders meeting earlier this month.

Mr. Icahn has recently criticized Forest Labs for failing to disclose its latest warning letter from the U.S. Food and Drug Administration for a violation of promotional practices by the company's sales representatives regarding its drug Daliresp. He has also recently alleged that Forest has built a poison pill into a license pact it inked in 2004.

Shares closed at $34.69 and were unchanged after hours. The stock is up 15% since the start of the year.

-Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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