CHANTIX^® (varenicline) is a prescription medicine to help adults 18 and over stop smoking. You may benefit from quit-smoking support programs and/or counseling during your quit attempt. It's possible that you might slip up and smoke while taking CHANTIX. If you do, you can stay on CHANTIX and keep trying to quit.

Some patients have reported changes in behavior, agitation, depressed mood, suicidal thoughts or actions when attempting to quit smoking while taking CHANTIX or after stopping CHANTIX. If either you, your family, or caregiver notice agitation, depressed mood, or changes in behavior that are not typical for you, or if you develop suicidal thoughts or actions, stop taking CHANTIX and call your doctor right away. Also tell your doctor about any history of depression or other mental health problems before taking CHANTIX, as these symptoms may worsen while taking CHANTIX.

The most common side effects include nausea (30%), sleep problems, constipation, gas, and/or vomiting. If you have side effects that bother you or don't go away, tell your doctor.

You may have trouble sleeping, vivid, unusual, or strange dreams while taking CHANTIX. You should use caution driving or operating machinery until you know how quitting smoking with CHANTIX may affect you.

CHANTIX should not be taken with other quit-smoking products. You may need a lower dose of CHANTIX if you have kidney problems or get dialysis.

Before starting CHANTIX, tell your doctor if you are pregnant, plan to become pregnant, or if you take insulin, asthma medicines, or blood thinners. Medicines like these may work differently when you quit smoking.