It is mainly used for the treatment and prevention of chronic bronchitis, colds and asthma, and has an immunomodulatory effect, activating cellular and humoral immunity in the body, enhancing the ability of natural killer cells, and ultimately strengthening the body’s ability to fight disease. It also has anti-allergic and asthma calming effects. It is usually injected intramuscularly, 1ml once, 2-3 times/week, three months is a course of treatment, patients with a history of allergy should still be prohibited, anaphylaxis may occur, the injection site may appear red and swollen and nodules and other side effects.