ATG is the English abbreviation for thymocyte globulin. The time of effect after ATG treatment for aplastic anemia varies according to the severity of the disease and the condition of the body, and the time of effect may be 1~9 months under normal circumstances. 1. ATG is a kind of immunosuppressant, which is the main treatment measure for aplastic anemia patients who are not suitable for hematopoietic stem cell transplantation treatment, and the effect time is 3~6 months in general. 2. If the anemia symptoms of remittent anemia are mild and the underlying physical condition is good, it may take effect in 1 month. If the anemia of remittent fever is severe, the blood picture is very low, and the basic condition of the body is poor, it may take about 9 months to have an effect. ATG treatment may not be 100% effective, and some patients may remain ineffective after treatment, or their condition may recur after treatment. Adverse drug reactions include skin rash, diarrhea, etc. It is contraindicated in patients with severe liver or kidney impairment and allergy to the product. The onset of ATG treatment for aplastic anemia is related to a variety of factors such as individual condition, physical condition, etc., and ATG treatment may not be suitable for all patients. Aplastic anemia should go to the hospital in time, under the guidance of the doctor for targeted treatment.