FDA adding warning to Plavix

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The food and drug administration said it was adding a new boxed warning to Plavix, an $8-billion-a-year drug sold by Bristol-Myers Squibb co and Sanofi-Aventis SA.

The new language will “warn about reduced effectiveness in patients who are poor metabolizers of Plavix,” the FDA said in a notice on its website.

Poor metabolizers are people whose bodies do not effectively convert Plavix to its active form.

Plavix is the second-best selling drug in the world. It loses patent protection in 2012.

Researchers have been studying an alternative drug for patients who cannot benefit from Plavix and details of their findings are expected to be released at a meeting of heart specialists next week.