Co-amoxiclav and Augmentin Are the Same Medication
Co-amoxiclav is simply the generic name for Augmentin—both refer to the identical combination of amoxicillin and clavulanic acid (a β-lactamase inhibitor). 1
Nomenclature Clarification
- Co-amoxiclav is the International Nonproprietary Name (INN) used primarily in the UK and Europe for the combination of amoxicillin with clavulanic acid 2, 3
- Augmentin is the brand name (originally developed and marketed by GlaxoSmithKline) for this same combination, used predominantly in the United States and other markets 4, 5, 6
- Amoxicillin-clavulanate or amoxicillin/clavulanate are alternative generic names for the identical formulation 7
Chemical Composition
Both names refer to a fixed-dose combination containing:
- Amoxicillin (a semisynthetic β-lactam antibiotic derived from the penicillin nucleus) 1
- Clavulanic acid/clavulanate potassium (a β-lactamase inhibitor produced by fermentation of Streptomyces clavuligerus) 1
The clavulanic acid component inactivates β-lactamase enzymes that would otherwise degrade amoxicillin, thereby extending the antibiotic spectrum to include β-lactamase-producing organisms such as Haemophilus influenzae, Moraxella catarrhalis, and Staphylococcus aureus 1, 4
Clinical Usage Across Guidelines
Multiple international guidelines use these terms interchangeably:
- British guidelines consistently refer to "co-amoxiclav" when recommending this antibiotic for respiratory infections 2, 3
- American guidelines typically use "amoxicillin-clavulanate" or reference "Augmentin" by brand name 7, 8, 9
- The FDA drug label uses "amoxicillin and clavulanate potassium" as the official designation 1
Available Formulations
The medication is available in multiple formulations under both naming conventions:
- Standard oral tablets (e.g., 500 mg/125 mg, 875 mg/125 mg amoxicillin/clavulanate) 1
- High-dose formulations (e.g., Augmentin XR 2000 mg/125 mg twice daily for adults, Augmentin ES-600 providing 90 mg/kg/day amoxicillin with 6.4 mg/kg/day clavulanate in children) 4, 5, 6
- Intravenous preparations (e.g., 1.2 g three times daily) 2, 3
Common Pitfall to Avoid
Do not assume these are different medications requiring separate consideration—prescribing "co-amoxiclav" versus "Augmentin" is purely a regional naming preference with no clinical distinction in composition, efficacy, or safety profile 10, 11