For excess arsenic elements in the body or chronic arsenic poisoning, sodium dimercaptopropane sulfonate or dimercaptopropanol, etc. can be used. Dimercapto can combine with arsenic ion, promote its metabolism, and eventually excrete it from the body. It can also be supplemented with vitamin b vitamin c and vitamin k. It has the effect of promoting metabolism. If the arsenic dose is too high, resulting in acute poisoning, it is best to do hemodialysis, through the extracorporeal circulation, the blood is ion discharge. If arsenic ions have caused skin damage, such as arsenic keratosis, while taking oral medication to drain arsenic, topical medication can be used locally, such as mometasone furoate ointment or vincristine ointment.