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Side Effects of Varenicline

Possible Varenicline Side Effects

Varenicline has been studied thoroughly in clinical trials. In these studies, the side effects that occur in a group of people taking the drug are documented and are then compared to side effects that occur in another group of people not taking the medicine. This way, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the medicine.
 
In these studies, the most common side effects of varenicline included:
 
  • Nausea -- in up to 30 percent of people
  • Insomnia -- up to 19 percent (see Chantix and Insomnia)
  • Headaches -- up to 19 percent
  • Abnormal dreams -- up to 13 percent
  • Gas -- up to 9 percent
  • Changes in taste -- up to 8 percent
  • Constipation -- up to 8 percent.
     
Other common varenicline side effects, occurring in 1 to 7 percent of people, included:
 
Weight gain was also a frequently reported side effect, although the exact percentage was not reported (see Chantix and Weight Gain). Also, up to 3 percent of people experienced sleeping problems and irritability when stopping the medication abruptly (see Chantix Withdrawal).
  
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