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Suicide Warnings for 2 Anti-Smoking Drugs

Federal drug regulators warned that patients taking two popular drugs to stop smoking should be watched closely for signs of serious mental illness, as reports mount of suicides among the drugs’ users.

But officials emphasized that fear should not stop patients from taking the smoking-cessation medicines, Chantix, made by Pfizer, and Zyban, made by GlaxoSmithKline, which also sells it under the brand name Wellbutrin, for depression.


Pfizer will add a so-called black box warning — the F.D.A.’s most serious caution — to the packaging information for Chantix.

The Pfizer drug, introduced in 2006, has about 90 percent of the market for prescription smoking-cessation drugs, according to IMS Health, a health care information company.

Glaxo will expand its existing black box warning on Wellbutrin, citing suicidal thoughts by patients who use it for depression, to include Zyban, which has had only modest sales in the smoking cessation market.

Both companies will also be required to conduct clinical trials to assess the mental health risks associated with the drugs’ uses. Pfizer is already enrolling schizophrenia patients in a trial.

Because smokers and people trying to quit are statistically more likely to be depressed and suicidal, officials for both companies said it was difficult to identify the specific impact of the drugs on those risks.

European officials first alerted the F.D.A. in 2007 to problems associated with Chantix. In September of that year, Jeffrey Carter Albrecht, a keyboard player from the pop-music group Edie Brickell and New Bohemians, was killed by a neighbor who had complained that Mr. Albrecht was banging on his door, ranting. Mr. Albrecht’s girlfriend blamed Chantix, which she said had made him hostile.

The widely publicized event led to a cascade of similar reports and scrutiny by F.D.A. safety officials, who have now received 98 reports of suicides and 188 reports of suicide attempts among those taking Chantix.

As officials looked more closely, they found to their surprise that Zyban has similar associated risks. The agency received 14 reports of suicides and 17 reports of suicide attempts among those taking Zyban.

No one knows why the drugs are associated with mental problems. In some cases, patients could be experiencing nicotine withdrawal, but some of the reports involved patients who had yet to stop smoking. And many of the events happened just as patients began or stopped therapy, officials said.

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