Sazetidine-A (6-(5-(S)-azetidin-2-yl)methoxypyridine-3-yl)hex-5-yn-1-ol) was synthesized according to published methods (Kozikowski et al. 2009 (link)). Mecamylamine hydrochloride, methyllycaconitine citrate hydrate (MLA), dihydro-beta-erythroidine hydrobromide (DHβE), and desipramine hydrochloride were purchased from Sigma (St. Louis, MO), sertraline hydrochloride from Toronto Research Chemicals (Ontario, Canada), varenicline tartrate from Allichem (Savage, MD) and 5-Iodo-A-85380 (5-I-A85380) dihydrochloride from Tocris Bioscience (Ellisville, MO). All drugs were dissolved in either saline, phosphate buffered saline, or injectable water and injected intraperitoneally (i.p) in a volume of 10 ml/kg. All doses are expressed as salt except for varenicline, which is expressed as the freebase.