Chantix (varenicline) is a partial agonist selective for a4ß2 nicotinic acetylcholine receptor subtypes used for cessation of smoking.
What Are Side Effects of Chantix?
Common side effects of Chantix include
nausea (may persist for several months),
stomach pain,
indigestion,
constipation,
gas,
vomiting,
headaches,
weakness,
tiredness,
unusual dreams,
sleep problems (insomnia),
headache, dry mouth, or
unpleasant taste in your mouth.
Chantix is not addictive and is not a controlled substance; however, some patients may experience irritability and sleep disturbance if Chantix is abruptly discontinued. Patients may experience psychiatric symptoms such as behavioral changes, agitation, depressed mood, and suicidal behavior while using Chantix. Tell your doctor if you have serious side effects of Chantix including
burning feeling in feet/toes, or
unusual pain in the legs when walking.