Drugs to improve human immunity include mannan peptide, pidomod oral solution and splenic aminopeptide oral lyophilized powder. 1. Mannitol peptide: Mannitol peptide has immune activity and can improve the body’s immune ability. The drug may cause fever, rash and other adverse reactions, and is contraindicated in patients with rheumatic heart disease, bronchial asthma and bronchitis. 2. Pitomod Oral Liquid: Pitomod Oral Liquid can improve the body’s immunity, reduce the possibility of recurrent respiratory tract infections or urinary tract infections and other diseases. People who are allergic to the drug are forbidden to take it, and the drug should be separated from food for a period of time. 3. Splenin Peptide Oral Freeze-Dried Powder: Splenin Peptide Oral Freeze-Dried Powder belongs to the immune body regulator, which can be used for the treatment of cellular immune function, to help the human body to improve immunity. The adverse reactions and contraindications of the drug have not been clarified, and it is forbidden to take the drug when its properties change. Patients should take the above drug under the guidance of a doctor to avoid irritation to the body.