The paper contains basic information relating to treatment with immunoglobulin. Presented indications for their use, among others: primary immunodeficiency, Kawasaki disease, Guillain-Barre syndrome, chronic lymphocytic leukemia, primary thrombocytopenia. The factors to consider when choosing a preparation: the content of IgG, IgA, method of administration (intravenous or subcutaneous). The most frequent side effects, depending on the organ localization. Presented at risk (obesity, diabetes, renal failure, hypovolemia) in which these symptoms may occur especially frequently, which should be taken into account in the conduct of therapy (adequate hydration, low-dose, slow infusion).