Gammaglobulin is effective for pneumonia and can be used as an adjunctive treatment. Gammaglobulin is a kind of preparation with the function of immune replacement and immune regulation, and after it enters into the body, it can rapidly increase the level of IgG in the blood of the recipients, and effectively enhance the body’s ability to resist infection as well as the function of immune regulation. Therefore, the use of gammaglobulin in pneumonia can effectively enhance the immunity and resistance, and play a role in assisting in the treatment of the disease, and promote the recovery of the body. However, it should be noted that allergic reactions may occur after the use of gammaglobulin, especially after repeated use, fever, chills, rash, transient headache, panic, nausea, etc.; allergic to gammaglobulin should be prohibited; gammaglobulin can only be used for intravenous infusion, and should be used with caution in people with serious acid-base metabolism disorders. Gammaglobulin is not the main treatment for pneumonia, patients with pneumonia need to cooperate with doctors to implement individualized treatment plans according to the severity of the individual’s condition, the cause of the disease, etc., to effectively promote the decline of inflammatory foci in the lungs.