Research Area: Neurological Disease Biological Activity: Cytisine is a nicotinic acetylcholine receptor agonist, and as a pharmaceutical preparation it is available for the treatment of nicotinism. It is a pyridine-like alkaloid that can be toxic in high doses. Pharmacologically it exhibits similar effects to nicotine due to structural similarity of the two molecules. In large doses it can interfere with respiration and become fatal.[1]