This product is suitable for sensitive bacteria caused by various infections, such as abscess, bacteremia, pneumonia and endocarditis. Among them, penicillin is the drug of choice for the following infections: hemolytic streptococcal infections, such as pharyngitis, tonsillitis, scarlet fever, erysipelas, cellulitis and puerperal fever. Pneumococcal infections such as pneumonia, otitis media, meningitis and bacteremia. Staphylococcal infection without penicillinase production. Anthrax. Tetanus, gas gangrene and other clostridium infections. Syphilis (including congenital syphilis). Leptospirosis. Relapsing fever. Diphtheria. Penicillin combined with aminoglycosides is used in the treatment of streptococcus viridis endocarditis. Penicillin can also be used to treat epidemic cerebrospinal meningitis. Actinomycosis. Gonorrhea. Vincent's angina. Lyme disease. Rat bite fever. Listeria infection. Many anaerobic bacterial infections other than Bacteroides fragilis. Penicillin can be used to prevent infective endocarditis in patients with rheumatic heart disease or congenital heart disease before oral, dental, gastrointestinal, or urogenital tract surgery and procedures.