Immunity is maintained for about 3 to 4 weeks after the injection of gammaglobulin, but it may be longer or shorter depending on the individual. Each person has a different body type and metabolic rate, so the duration of effect maintenance after gammaglobulin injection varies from person to person. Gammaglobulin is a passive immunization agent and is mainly used to treat patients with severe combined immunodeficiency or those suffering from Gammaglobulin deficiency. It is also used to prevent hepatitis A, hepatitis C, herpes zoster, mumps, measles and other diseases. The effect of human immunoglobulin can be maintained for about 3~4 weeks after injection, but the metabolic rate and physical condition of each person are different, so the duration of the effect after injection of gammaglobulin varies from person to person. It is contraindicated for those who are allergic to the ingredients in HGI. Immunoglobulin C should be used according to the dosage form, some patients may experience adverse reactions such as epidermal papules, itching, cough, fever, loss of appetite, dizziness and headache after injection of immunoglobulin C. Attention to the nature of the drug changes can not be used, once opened to be used up, can not be used twice, serious acid-base metabolic disorders in patients with caution. Once the injection of C immunoglobulin after the occurrence of uncomfortable symptoms, need to go to the hospital in time to avoid delays in the condition.