Also available in 1 mL, 5 mg, 10 mg, 25 mg, 100 mg and bulk. Please contact Fisher for quotes. Varenicline Tartrate (CP 526555-18) is a benzazepine derivative that functions as an ALPHA4/BETA2 NICOTINIC RECEPTOR partial agonist. It is used for SMOKING CESSATION. Purity 99.9%