What antibiotic is recommended for a minor lacerated wound on the head in an otherwise healthy adult?

Antibiotic Prophylaxis for Minor Head Lacerations

Prophylactic antibiotics are NOT recommended for minor, uncomplicated head lacerations in healthy adults. The evidence consistently demonstrates no significant benefit in reducing infection rates for simple wounds, and routine antibiotic use may paradoxically increase infection risk while contributing to antimicrobial resistance 1, 2.

Primary Recommendation

For a minor lacerated wound on the head in an otherwise healthy adult:

• Do NOT prescribe prophylactic antibiotics 1, 3
• Focus on proper wound irrigation with sterile saline or tap water 1
• Ensure adequate wound closure and occlusion 1
• Update tetanus prophylaxis if not received within 10 years 4

Evidence-Based Rationale

The research evidence strongly supports withholding antibiotics for simple lacerations:

• Multiple prospective studies show no significant reduction in infection rates with prophylactic antibiotics for simple lacerations 3
• A 2025 study of 249,261 upper-extremity lacerations found that prophylactic antibiotics were associated with increased odds of infection (OR = 1.31) after controlling for confounding variables 2
• Overall infection rates for simple lacerations remain low at approximately 2-6.6% regardless of antibiotic use 5, 3, 2

When Antibiotics ARE Indicated

Only prescribe antibiotics if the wound becomes infected or has specific high-risk features:

High-Risk Wounds Requiring Antibiotics:

• Bite wounds (animal or human) - use amoxicillin-clavulanate 875/125 mg twice daily 6, 4
• Heavily contaminated wounds with visible debris or soil
• Puncture wounds penetrating deep structures
• Wounds with signs of established infection: purulence, spreading erythema, warmth, lymphangitis

Patient Risk Factors Requiring Consideration:

• Diabetes mellitus (OR 15.8 for infection) 5
• Immunocompromised state
• Prosthetic joints or cardiac valves

Treatment Algorithm for Infected Wounds

If infection develops:

• Superficial mild infections: Topical agents may suffice 1
• Deeper mild-moderate infections: Oral antibiotics
  • First choice: Amoxicillin-clavulanate 6, cloxacillin, or cefalexin 6
  • Alternative: Clindamycin 300 mg three times daily 4
• Severe infections: Parenteral antibiotics and specialist referral 1

Essential Wound Care (More Important Than Antibiotics)

1. Irrigation: Copious sterile saline or tap water (no evidence that antiseptics are superior) 1
2. Debridement: Remove devitalized tissue and foreign material
3. Closure: Suturing can be completed up to 24 hours post-injury for head wounds 1
4. Occlusion: Keep wound covered initially
5. Tetanus: Administer Tdap if not given in past 10 years 4

Common Pitfalls to Avoid

• Do not prescribe antibiotics "just to be safe" - this increases resistance and may increase infection risk 2
• Do not confuse contamination with infection - visible dirt requires cleaning, not antibiotics
• Do not extend antibiotics beyond 24 hours postoperatively even if surgery was required 7
• Do not use first-generation cephalosporins for bite wounds - they miss critical pathogens like Eikenella and Pasteurella 4

Special Consideration for Head Location

Head and face wounds have excellent blood supply and typically heal well without antibiotics. The scalp's rich vascular network provides natural infection resistance, making prophylactic antibiotics even less justified for this anatomic location.