Also known as Narcotine hydrochloride, Noscapine Hydrochloride a hydrochloride salt of the phthalideisoquinoline alkaloid noscapine. Derived from the Papaver somniferum plant, it binds to tubulin and inhibits it without affecting microtubule polymerization. A crystalline solid, it is orally available and freely soluble in water and ethanol.