Dexamethasone has different side effects depending on how and when it is used, and the time to eliminate the side effects varies. They can be eliminated in a short period of about 1 week, but in severe cases, they may not be eliminated for a long time. Dexamethasone is a long-acting hormone drug and should not be taken for a long time, otherwise it will cause different degrees of side effects such as diabetes, dizziness and weakness, nausea and vomiting and even peptic ulcers, as well as osteoporosis and femoral head necrosis. The half-life of dexamethasone in human tissues is about 2-3 days. Therefore, the side effects of short-term, low-dose dexamethasone use usually subside in about 1 week. Long-term high dose use of dexamethasone, on the other hand, can lead to serious complications such as peptic ulcers, diabetes, and osteoporosis, and patients may not recover. In addition, the use of dexamethasone has clear indications, and patients are advised to visit the Infectious Diseases Department of a regular hospital and use it under the guidance of a professional doctor.