Cytisine Products | Cleanchem - Cytisine is an alkaloid used in smoking cessation treatments, acting as a partial agonist of nicotine receptors in the brain. It reduces withdrawal symptoms and cravings associated with quitting smoking by mimicking nicotine? effects without the addictive properties. Cytisine has been widely used in Eastern Europe for smoking cessation and is now gaining attention in other regions. Side effects may include nausea, insomnia, and dizziness.