Gammaglobulin has no platelet-raising effect and is mainly used to treat diseases that cause thrombocytopenia. The speed of its effect depends on the degree of disease recovery. For primary thrombocytopenia and infection-associated thrombocytopenia, gammaglobulin is effective, and generally speaking, it may be effective after 3 days, and platelets may increase. For other causes of thrombocytopenia, the input of gammaglobulin may not be effective, so there is no immediate effect, need to be under the guidance of the doctor for other appropriate treatment. It should be noted that if the cause of the primary disease is not removed, platelets will still fall after a certain period of time, and further treatment should be carried out under the guidance of a doctor.