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At a glance

Benzathine Penicillin is a long-acting penicillin antibiotic used to treat a variety of bacterial infections. It is effective in treating sore throat, syphilis, and preventing rheumatic fever.

Indications
  • Group-A beta-haemolytic streptococcal infections
  • Syphilis
  • Prevention of rheumatic fever
  • Acute otitis media
Pharmacology

Benzathine benzylpenicillin has the same antimicrobial action as benzylpenicillin which exerts its bactericidal action on growing and dividing bacteria by inhibiting bacterial cell wall synthesis. IM administration results in a prolonged effect, but because of its relatively low blood concentrations, its use should be restricted to microorganisms that are highly susceptible to it.

Dosage

Adult Dosage:

  • Group-A beta-haemolytic streptococcal infections: 600,000 units as a single IM dose
  • Prevention of rheumatic fever: 1.2 million units monthly IM injection
  • Acute otitis media: 600,000 units as a single injection
  • Early syphilis: 2.4 million units as a single dose
  • Late syphilis: 2.4 million units weekly for 3 successive weeks
  • Neurosyphilis: IV benzylpenicillin 2-4 million units every 4 hours for 10 days, followed by benzathine penicillin 2.4 million units weekly for 3 weeks

Pediatric Dosage:

  • Newborns and infants: 50,000 units/kg as a single dose
  • Children >60 lb: 900,000 units as a single dose
Side effects
  • Injection site pain, swelling, redness
  • Rash
  • Allergic reactions
  • Nausea
  • Diarrhea
Use in pregnancy

[SAFE IF PRESCRIBED] Benzathine Penicillin is generally considered safe to use during pregnancy. Animal studies have shown low or no adverse effects to the developing baby.

Pregnancy Category: C — always consult a doctor before taking during pregnancy.

Precautions & warnings
  • Inform your doctor if allergic to penicillin or cephalosporin antibiotics
  • Complete the full course - do not stop even if you feel better
  • Stop and inform your doctor immediately if you develop allergic reactions (rash, swelling of face/throat/tongue, breathing difficulties)
  • Ischaemic reactions may occur at injection site
Overdose effects

Overdose may cause nausea, vomiting, diarrhea, and electrolyte imbalance. Consult a doctor if symptoms occur.

Storage conditions

Store below 30°C, away from light and moisture.

Benzathine Penicillin — see the full informationPharmacology, precautions, pregnancy, overdose and the rest on the generic page
⚠️ This information is for educational purposes only — not a substitute for medical advice. Consult a registered physician before taking any medicine.