What to give as an antibiotic for minor wound
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Here is a complete, evidence-based guide on antibiotics for minor wounds:
Antibiotics for Minor Wounds
First principle: Most minor wounds do NOT need antibiotics
The most important intervention is copious wound irrigation. Prophylactic antibiotics are not indicated for the vast majority of traumatic wounds in healthy patients. Thorough cleaning prevents infection better than any drug.
- Pfenninger and Fowler's Procedures for Primary Care, p. 5454
Topical Antibiotics (for abrasions, lacerations, minor cuts)
These are the preferred choice for truly minor, clean wounds:
| Agent | Notes |
|---|---|
| Bacitracin ointment | Good first choice; low allergy risk; OTC |
| Polysporin (bacitracin + polymyxin B) | No neomycin - lower contact dermatitis risk |
| Neosporin / Triple antibiotic (bacitracin + polymyxin B + neomycin) | Broad spectrum but ~1% risk of neomycin contact dermatitis (redness/itch that mimics infection) |
| Mupirocin 2% (Bactroban) | Higher antibacterial activity vs Staph/Strep; not significantly better than triple antibiotic for minor wounds but costs more |
Key notes:
- Apply after cleaning, 2-3x/day under a dressing
- Do NOT use over tissue adhesive/glue - the ointment dissolves it
- Ointments also prevent the dressing from sticking to the wound, which is a practical benefit
- Roberts and Hedges' Clinical Procedures in Emergency Medicine, p. 4538-4542
Oral Antibiotics (only if infection is present or high risk)
Signs warranting oral antibiotics: redness spreading beyond wound edges, warmth, swelling, purulent discharge, fever, or lymphangitis.
| Drug | Dose | Duration | Notes |
|---|---|---|---|
| Cefalexin | 500 mg 4x/day | 5-7 days | Drug of choice; covers Staph/Strep |
| Amoxicillin-clavulanate | 500/125 mg 3x/day | 5-7 days | Better for contaminated wounds, animal/human bites |
| Clindamycin | 300 mg 3x/day | 5-7 days | Use if penicillin-allergic |
| TMP-SMX (Co-trimoxazole) | 160/800 mg 2x/day | 5-7 days | If MRSA is suspected |
When are oral antibiotics DEFINITELY indicated?
- Bite wounds (cat/human bites especially) - use amoxicillin-clavulanate; cat and human bites get infected at high rates even with good irrigation
- Dog bites - lower risk (<5% infection rate), but treat if signs develop
- Contaminated wounds - soil, feces, saliva, seawater, meat exposure
- Wounds in immunocompromised patients (diabetes, steroids, HIV)
- Wounds on the hands or feet (poor blood supply, high risk)
- Established wound infection with systemic features
What to avoid
- Neomycin-containing products in patients with sensitive skin or repeated use - can cause contact dermatitis that looks like infection
- Oral antibiotics for clean, minor, uninfected wounds in healthy people - not evidence-based and promotes resistance
Bottom line: Clean the wound well, apply bacitracin or Polysporin ointment, and cover with a dressing. Reserve oral cefalexin or amoxicillin-clavulanate for infected wounds or high-risk situations like bites or contaminated injuries.
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