By Michael Calia 
 

Mylan Inc. (MYL) on Thursday called a federal court's ruling on a patent related to Pfizer Inc.'s (PFE) Celebrex "favorable," and said it plans to start selling a generic version of the drug in May.

Pfizer on Wednesday said the U.S. District Court for the Eastern District of Virginia invalidated a patent that would have extended its U.S. exclusivity for the painkiller by 18 months. Celebrex brought in $1.93 billion in U.S. sales for Pfizer last year.

Pfizer said it will pursue all available remedies to fight the ruling, including an immediate appeal.

Pfizer had brought a patent-infringement case against six generic drug makers, including Mylan and Teva Pharmaceutical Industries Ltd. (TEVA).

Mylan on Thursday said it believes it may be entitled to 180 days of shared exclusivity on the generic market for the 100-milligram, 200-milligram and 400-milligram strengths of the drug.

Mylan, along with Teva and Actavis PLC (ACT), already have received tentative approval from the Food and Drug Administration to sell generic versions of Celebrex.

Shares of Mylan were inactive premarket. The stock closed at $53.06 Wednesday and is up 22% so far this year.

Write to Michael Calia at michael.calia@wsj.com

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