Benzylpenicillin, also known as penicillin G, is a narrow-spectrum antibiotic used to treat bacterial infections. It belongs to the class of antibiotics known as penicillins. Some synonyms for benzylpenicillin include penicillin G potassium, procaine penicillin G, and benzathine penicillin G. These variations of benzylpenicillin are often used to provide a longer-lasting effect when treating infections. Other synonyms include benzylpenicillin sodium and penicillin G sodium. These different names are used interchangeably in medical settings and are important for ensuring the correct dose and formulation of the medication is given to patients.