Manufactured by Pfizer, Chantix got the US FDA approval on May 11, 2006 as a prescription drug for nicotine-addiction. The clinical trials and early successes of the drug led to a massive demand of the pills the world over. Resultantly, the doctors in America prescribe Chantix to anyone walking in for anti-smoking treatment without worrying about the side effects since the drug is known for its light-on-stomach features. The side effects of Chantix are no different than the side effects of any other normal drug.