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Smoking-Cessation Drug Chantix Linked to Heart Problems

THURSDAY, June 16 (HealthDay News) -- The quit-smoking drug Chantix may lead to a small but increased risk of heart problems in people with cardiovascular disease, the U.S. Food and Drug Administration said Thursday.

In a study of 700 smokers with cardiovascular disease who were undergoing treatment with Chantix or a placebo, researchers saw a small but "statistically significant" greater risk of chest pain, non-fatal heart attacks and other cardiovascular problems in patients taking the quit-smoking drug, the FDA said.

Details of the new findings will be shared with doctors and will be included in the drug's medication guide to patients, the agency said.

In July 2009, the FDA mandated that Chantix (varenicline tartrate) and a second smoking-cessation drug, Zyban, carry a "black-box" warning about the potential risks of psychiatric problems, including depression and suicidal thoughts.

In its announcement Thursday, the FDA noted that smoking is a major contributor to cardiovascular disease, the number one killer of Americans. So doctors and their patients should weigh the "known benefits of Chantix against its potential risks when deciding to use the drug in smokers with cardiovascular disease," the agency said in a statement on its website.

Patients taking Chantix, which received FDA approval in 2006, should contact their health-care professional if they experience new or worsening symptoms of cardiovascular disease.

The FDA said it will continue to evaluate the risks and benefits associated with Chantix and is requiring the manufacturer -- Pfizer Inc. -- to conduct an analysis of all previous randomized, placebo-controlled trials of the drug. The agency said it will release those findings to the public when they become available.

In a statement, Pfizer pointed out that smoking is a key risk factor for heart disease, and quitting the habit brings heart benefits that are "immediate and substantial," the Wall Street Journal reported. Pfizer agreed that patients should talk to their doctors to "determine what medications are right for them."

More information

For more on how to quit smoking, visit the U.S. Centers for Disease Control and Prevention.

-- HealthDay staff

SOURCE: U.S. Food and Drug Administration, June 16, 2011; Wall Street Journal

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