Introduction
Amoxicillin is one of the most commonly prescribed antibiotics in the world, used for a wide range of bacterial infections in both adults and children.
What Amoxicillin Treats
Indicated for strep throat, sinusitis, ear infections, urinary tract infections, H. pylori eradication, and dental infections, among others.
How It Works
Amoxicillin is a beta-lactam antibiotic that disrupts bacterial cell wall synthesis by binding to penicillin-binding proteins, leading to cell lysis and death.
Dosage
Adult dosing is typically 500 mg three times daily or 875 mg twice daily, for 5–10 days depending on the infection. Pediatric dosing is weight-based.
Penicillin Allergy Considerations
True penicillin allergy affects fewer than 1% of patients. Cross-reactivity with amoxicillin is lower than historically assumed. Allergy testing can clarify risk.
Antibiotic Resistance
Completing the full antibiotic course and using antibiotics only for bacterial — not viral — infections helps combat resistance. Do not save antibiotics for later use.
Side Effects
Diarrhea, nausea, and rash are most common. Taking amoxicillin with food reduces GI upset. Severe hypersensitivity reactions are rare but require immediate care.
Conclusion
Amoxicillin remains a safe, effective first-line antibiotic for many common bacterial infections. Responsible use preserves its effectiveness for future generations.