The test point of this problem is the processing effect of nux vomica. Semen Strychni has the effects of dredging collaterals, relieving pain, resolving hard mass and reducing swelling. Raw nux vomica is toxic and hard, so it can only be used externally. After sand frying or frying, the texture becomes brittle, and it is easy to crush and remove fluff. After processing, the toxicity can be reduced and it can be taken orally.