COMMON side effects when using Chantix:
Constipation; gas; headache; increased appetite; nausea; stomach upset; taste changes; trouble sleeping; vivid, strange, or unusual dreams; vomiting.
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, throat, or tongue; unusual hoarseness); behavior changes; chest pain; fainting; fast, slow, or irregular heartbeat; hallucinations; memory loss; new or worsening mental or mood problems (eg, aggression, agitation, anger, anxiety, depression, nervousness, thoughts of hurting other people); persistent trouble sleeping; red, swollen, blistered, or peeling skin; seizures; severe or persistent nausea; suicidal thoughts or actions; vision changes.
Neuropsychiatric symptoms and suicidality
Angioedema and hypersensitivity reactions
Accidental injury
I took chantix and the only thing I had go wrong was thinking I was done too soon, and dreams at night. It may sound morbid but I like the intense dreams.
Thanks FDA