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Side effects of varenicline

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Tell your doctor if any of these symptoms bother you or do not go away:

• Nausea
• Insomnia
• Changes in dreaming
• New or worse mental health problems
• Headache
• Constipation
• Gas
• Vomiting

Call your doctor immediately if you experience:

• Thoughts about suicide or dying
• Thoughts, plans, or attempts to commit suicide
• New or worse depression, anxiety, or panic attacks
• Feeling very agitated or restless
• Increased thoughts of or acting aggressive, being angry or violent
• Increased thoughts of or acting on dangerous impulses
• An extreme increase in activity and talking (mania)
• Abnormal thoughts or sensations
• Seeing or hearing things that are not there (hallucinations)
• Feeling people are against you (paranoia)
• Feeling confused
• Other unusual changes in behavior or mood
• Swelling of the face, mouth, and throat that can cause trouble breathing
• Rash with peeling skin or blisters in your mouth