Skikon, i.e. BCG Polysaccharide Ribonucleic Acid Injection, the duration of the effect of the course of treatment needs to be decided according to the severity of the patient’s condition, resistance and other factors, and there is no definite cycle. BCG Polysaccharide Ribonucleic Acid Injection is a kind of immunomodulator, which has the effect of enhancing the body’s ability to resist diseases, preventing and treating chronic bronchitis, colds and asthma. Generally, three months is a course of treatment, but the specific number of courses of treatment to see the effect needs to be decided according to the severity of the patient’s condition and resistance. If the condition is serious and the resistance is weak, it may take more than one course of treatment to see the effect. If the condition is mild and the resistance is strong, it may take one cycle to see obvious results. Redness, swelling and nodules at the injection site may appear during the medication, which will subside naturally within a week after applying hot compresses; if allergic reaction, rash or shock occurs, consult a doctor promptly. Allergic to the ingredients of this drug is prohibited. It is not suitable for those who suffer from acute infectious diseases (such as measles, whooping cough, pneumonia, etc.), acute conjunctivitis, acute otitis media, etc. It should be used under the guidance of a doctor. It should be used in a standardized manner under the guidance of a doctor.