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What are some side effects of Chantix®?

Nausea is the most common side effect associated with varenicline, affecting about 30% of users (but resulting in less than 3% discontinuation rates). Insomnia appears to be substantially less of a problem for Chantix users than for users of bupropion (Zyban®). Other reported side effects include headaches, trouble sleeping, unusual dreams, flatulence (gas), and changes in taste.


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