Used primarily as an antibiotic to treat bacterial infections. Effective against a wide range of Gram-positive bacteria, including streptococci, staphylococci, and certain anaerobic bacteria. Commonly administered for infections such as pneumonia, meningitis, and endocarditis. Also used in the treatment of syphilis and other sexually transmitted infections. Often given intravenously or intramuscularly for severe infections. Plays a critical role in preventing and controlling bacterial infections in both clinical and hospital settings.