Penicillin is mainly applied to various infections caused by sensitive bacteria, such as hemolytic streptococcus caused by infections pharyngitis, tonsillitis, scarlet fever, dengue, cellulitis and puerperal fever, etc.; Streptococcus pneumoniae infections, such as pneumonia, otitis media, meningitis and bacteremia, etc.; penicillin is used in conjunction with aminoglycosides for the treatment of Streptococcus herbiculosis endocarditis and so on. Adverse reactions to penicillin sodium for injection include allergic reactions, toxic reactions and secondary infections; it is contraindicated in patients with a history of allergy to penicillins or a positive penicillin skin test; it should be used with caution in patients with allergic diseases such as asthma, eczema, chilblain fever and urticaria. It should be noted that before using the drug must be asked in detail about the history of drug allergy and penicillin skin test, a positive reaction is prohibited, with copper sulfate method of measuring urine sugar may appear false positive, this product can make serum alanine aminotransferase or menthylamine aminotransferase elevated, because it can be secreted from the breast milk, breastfeeding women using the drug is advisable to suspend breastfeeding. The above content is for reference only, patients who need to use penicillin sodium for injection, please be sure to use reasonable medication under the guidance of a professional doctor, do not self-medication.