Varenicline (trade name Chantix in the USA and Champix in Europe and other countries, marketed by Pfizer, usually in the form of varenicline tartrate) is a prescription medication used to treat smoking addiction. Varenicline is a nicotinic receptor partial agonist

Zolpidem is a prescription medication used for the short-term treatment of insomnia, as well as some brain disorders. It is a short-acting nonbenzodiazepine hypnotic that potentiates gamma-aminobutyric acid (gaba), an inhibitory neurotransmitter, by binding to gamma-aminobutyric acid (gabaa) receptors at the same location as benzodiazepines.