Amoxicillin
Penicillin antibiotic · Infectious Disease
Indications
- Community-acquired pneumonia
- Urinary tract infection
- H. pylori eradication
- Otitis media
- Sinusitis
Dosing
- Adult
- 500 mg–1 g TDS; severe: 1 g TDS
- Paediatric
- < 10 years: 250 mg TDS (mild); 500 mg TDS (severe)
Routes
- Oral
- IV
- IM
Contraindications
- Penicillin allergy
- Infectious mononucleosis (rash risk)
Side effects
- Diarrhoea
- Nausea
- Rash
- Anaphylaxis (rare)
Monitoring
- Allergy history before first dose
Key interactions
- Methotrexate (reduced excretion)
- Warfarin (INR monitoring)
Reviewed by DocBuddy Clinical Team on . Written as a study aid for medical students. Always check a current local formulary before prescribing.
Practise the pharmacology
Questions on Amoxicillin and the rest of infectious disease pharmacology are in the app, with the drug cards a tap away while you answer.