Static C generally refers to intravenous human immunoglobulin, the interval can be one month, one week or continuous infusion, depending on the type of disease, can not be generalized. Intravenous human immunoglobulin has the dual role of immune replacement and immune regulation, applicable to a variety of immunoglobulin deficiency and autoimmune disease patients, different types of diseases, patients need to be injected at different intervals, as follows: Patients with primary immunoglobulin deficiency or hypoglobulinemia are usually injected once a month, and patients with primary thrombocytopenic purpura are usually injected once a week. Patients with severe infections usually need to be infused for 2 to 3 consecutive days. According to the changes in the patient’s condition, the doctor will also adjust the interval between doses, so patients can follow the doctor’s instructions. The drug generally has no adverse reactions, individual patients may have a transient headache, panic, nausea, etc., usually can be recovered by themselves. Patients should inform the doctor promptly if they have any serious discomfort.