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For many people, Chantix (varenicline) is a prescription drug that has helped them stop smoking. The drug works by stimulating receptors in the brain that use the neurotransmitter called acetylcholine. However, there are concerns that the drug may cause severe behavioral and mood changes. In late November 2007, the US Food and Drug Administration (FDA) started to examine reports that Chantix causes suicidal thoughts, aggressive and erratic behavior and drowsiness.
In the meantime, before the reports are completely analyzed, the FDA recommends that people who use Chantix should be monitored for behavior and mood changes and if they notice any behavioral changes, they should contact their doctors.
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