Penicillin G (Penicillin G (benzylpenicillin)) — Uses, Dosage, Side Effects & Safety

Drug class: Antibiotic (Natural Penicillin)

Overview

Penicillin G is a natural penicillin antibiotic used to treat a wide range of serious bacterial infections, including pneumonia, meningitis, endocarditis, syphilis, and infections of the skin, blood, and joints. It is especially effective against infections caused by susceptible Gram-positive bacteria and some Gram-negative organisms. Penicillin G works by interfering with the formation of the bacterial cell wall, causing the bacteria to die. It is usually given by injection, as it is not absorbed well when taken by mouth. This medication is considered a first-line treatment for many severe infections and is included on the World Health Organization's List of Essential Medicines. Key points: Always complete the full course as prescribed, even if you feel better. Inform your healthcare provider if you have a history of allergies to penicillins or other beta-lactam antibiotics. Seek immediate medical help if you experience signs of a severe allergic reaction.

Therapeutic uses

• Streptococcal infections (e.g., pharyngitis, scarlet fever)
• Syphilis
• Meningitis (bacterial)
• Pneumonia (pneumococcal)
• Diphtheria

Common side effects

• Diarrhea
• Nausea
• Vomiting
• Rash
• Hives
• Allergic reaction (anaphylaxis)
• Seizures
• Kidney problems

Frequently Asked Questions about Penicillin G

What infections does Penicillin G treat?

Penicillin G is used to treat serious bacterial infections such as pneumonia, meningitis, endocarditis, syphilis, and infections of the skin, blood, and joints caused by susceptible bacteria.

How is Penicillin G administered?

Penicillin G is given by injection, either into a vein (IV) or muscle (IM), usually by a healthcare professional.

What should I do if I have a penicillin allergy?

Do not take Penicillin G if you have a known allergy to penicillins. Inform your healthcare provider about any previous allergic reactions to antibiotics.

Can Penicillin G be used during pregnancy or breastfeeding?

Penicillin G is generally considered safe during pregnancy and breastfeeding, but always consult your doctor before use.

What are the signs of a serious reaction to Penicillin G?

Serious reactions include difficulty breathing, swelling of the face or throat, severe rash, or persistent diarrhea. Seek emergency medical help if these occur.

Does Penicillin G interact with other medications?

Yes, it can interact with methotrexate, oral contraceptives, anticoagulants, and probenecid. Always inform your doctor of all medications you are taking.

What should I do if I miss a dose?

Contact your healthcare provider for instructions. Do not double the next dose to make up for a missed one.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.