if you develop these stop taking chantix and see your doctor right away as some can be life-threatening. if you have a history heart or blood vsel problems, tell your doctor if you have new or worse symptoms. get medical help right away if you have symptoms of a heart attack. use caution when driving or operating machinery. common side effects include nausea, trouble sleeping and unusual dreams. with chantix and with the support system it worked. it worked for me. [ male announcer ] ask your doctor if chantix is right for you.