Chantix (varenicline), made by Pfizer, is used to help adult smokers quit. Since it went on sale, suicidal thoughts have been reported in some people taking it to stop smoking.
The US Food and Drug Administration (FDA) is gathering and analysing more data. Patients taking the drug are being asked about changes in mood, and the FDA advises them not to drive or operate machinery until they know the drug doesn't affect them.
Update: a large trial (EAGLES, 2016) found no significant increase in serious mental health side effects with varenicline compared with nicotine patches or placebo, and the FDA removed its boxed warning. Anyone who notices changes in mood or behaviour while taking it should still tell their doctor.
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