Han Fangzhi is the root of Stephania tetrandra S. Mcore, a species of the genus Stephania in the family Fangzhiidae, which is an expectorant, antipyretic and analgesic drug, and its active ingredients are alkaloids. The main ones are hanfengzhi methylin and hanfengzhi ethylin. In addition to clinical use as a treatment of hypertension, neuropathic pain, anti-amoeba protozoa, but also the powder to prevent the alkaloids of iodomethyl, or bromomethyl compounds as a muscle relaxant applications, in addition to hanfenpian methylin in animal experiments have anticancer and vasodilatory effects.

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