Chantix Pfizer - Quit smoking - Chantix (Varenicline Tartrate) is a trademark drug of Pfizer Inc. that got approved by the FDA in May 2006. It is approved in US market and in Europe (by the name of Champix). chantix comes with customized treatment to support patients to quit smoking successfully. Most smokers do not prefer to smoke but are addicted to the nicotine in tobacco.