药用细辛,乃马兜玲科多年生草本植物细辛之全草。主产于辽宁、陕西等地,辽宁产者为辽细辛,陕西产者为华细辛。其性味辛温,入心肺肾经。功能发散表寒,祛风止痛,温肺化饮,兼能开窍。历代医家对细辛的运用,亦各有心得,代有发挥,使细辛更扬其所长,成为内服外用、一药多能的临证良药。然自宋《本草别说》提出:“细辛,若单用末,不可过钱匕,多即气闷塞,不通者死。”之后,李时珍倡其说:“细辛不过钱”之说也随之而生,使不少医者不敢越雷池半步,畏细辛如蛇 Medicinal Asarum is the whole herb of Asarum perennial herb Asarum. Mainly produced in Liaoning, Shaanxi and other places, Liaoning producers are Liao Xixin, Shaanxi producers are Hua Xixin. Its spicy taste, into the heart and lungs. The functions of divergence are cold, cold wind, pain, warm lung and drink, and can also open. The doctors of all ages used the Asarum, and they also had their own experiences. On the one hand, they made use of it to make Asahi’s strengths even better, and it became a clinically beneficial medicine for internal and external use, as well as a powerful and versatile medicine. However, since Song, “Do not say,” said: “Asarum, if only used at the end, not too much money, more than the stuffy stuffy plug, unreasonable who died.” Afterwards, Li Shizhen advocated it: “Asana no money,” said It also led to many doctors dare not to step in and out of the game.