Tabex® Original - Quit Smoking - Natural Cytisine from Sopharma A Biased View of Quit Smoking with Cytisine: How to Stop Smoking Easily Active substance: Cytisine - 1. 5 mg. Excipients: lactose monohydrate (28. 0 mg), microcrystalline cellulose (67. 5 mg), talc (2. 0 mg), magnesium stearate (1. 0 mg)