Benzylpenicillin, also known as penicillin G (PenG[3]) or BENPEN,[4] and in US military slang "Peanut Butter Shot"[5] is an antibiotic used to treat a number of bacterial infections.[6] This includes pneumonia, strep throat, syphilis, necrotizing enterocolitis, diphtheria, gas gangrene, leptospirosis, cellulitis, and tetanus.[6] It is not a first-line agent for pneumococcal meningitis.[6] Due to benzylpenicillin's limited bioavailability for oral medications, it is generally taken as an injection in the form of a sodium, potassium, benzathine, or procaine salt.[7] Benzylpenicillin is given by injection into a vein or muscle.[2] Two long-acting forms benzathine benzylpenicillin and procaine benzylpenicillin are available for use by injection into a muscle only.[6]
Side effects include diarrhea, seizures, and allergic reactions including anaphylaxis.[6] When used to treat syphilis or Lyme disease a reaction known as Jarisch–Herxheimer may occur.[6] It is not recommended in those with a history of penicillin allergy.[6] Use during pregnancy is generally safe in the penicillin and β-lactam class of medications.[6]
Benzylpenicillin is on the World Health Organization's List of Essential Medicines.[8]
https://en.wikipedia.org/wiki/Benzylpenicillin
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