How long can you take Oyster San to stop sweating needs to be determined according to the patient’s personal constitution and condition, and cannot be generalized. Oyster powder is mainly composed of astragalus, ephedra root, oyster and other traditional Chinese medicines, with astringent yin to stop sweating (astringent yin fluid, reduce sweating), beneficial qi and solidifying the surface of the efficacy, clinically used in the treatment of physical weakness of self-sweating (involuntary sweating during the day, sweating aggravated by a slight movement), night sweating (sweating abnormally after going to sleep, waking up sweating to stop) evidence. Its contraindications and adverse reactions are not clear at present. It should be noted that each person’s personal constitution is different, taking the drug efficacy time is also different, so it can not be determined after taking the drug when you can stop sweating, specific should follow the doctor’s instructions, according to the physician’s diagnosis of medication. If the drug is not effective for a long time, you should seek medical treatment.