There is no clinical penicillin drug, it should be penicillin. Penicillin is used to treat infectious diseases, and the duration of the medication varies from 3 days to several weeks, depending on the condition. Penicillin can be used for the treatment of bacterial infectious diseases such as Streptococcus pyogenes and Streptococcus hemolyticus. For infectious diseases such as urethritis and cystitis, a short course of anti-infective treatment usually requires 3 to 7 days of medication. When used to treat severe infections such as cellulitis, pyogenic infections, and pneumonia, it needs to be administered for about 10 days to ensure that the causative organisms are completely eliminated. When used to treat diseases such as meningitis and endocarditis caused by Streptococcus pyogenes, treatment is required for several weeks. It should be noted that a skin test is required before using the drug, and if an allergic reaction occurs, the drug is prohibited. Adverse reactions such as nausea, vomiting, anemia, rash, and respiratory distress should be immediately discontinued during the use of the drug. Pregnant and lactating women are advised to use penicillin with caution, drug allergy, infectious mononucleosis and other prohibited use of the drug. Penicillin should be used under the guidance of a physician, if there is a special medical advice, it is recommended to follow the medical advice.