VARENICLINE. Champix active molecule : Varenicline is a drug recommended in the framework of tobacco withdrawal date of authorization of commercialization : September 2006, commercialized in France beginning of 2007. It acts as a partial agonist of nicotinic receptors. Here, conditionning of the beginning of treatment : a week of tablets of 0,5 mg of varenicline white on blue background, once then twice a day then a week of tablets of 1 mg of varenicline light blue on green background.