What medication should be given for hand swelling caused by an animal scratch?

Antibiotic Treatment for Hand Swelling from Animal Scratch

For hand swelling from an animal scratch, start oral amoxicillin-clavulanate 875/125 mg twice daily for 7-10 days immediately 1.

First-Line Antibiotic Choice

Amoxicillin-clavulanate is the recommended first-line oral antibiotic for animal bite and scratch injuries according to IDSA guidelines 1. This combination provides coverage against the most common pathogens:

• Pasteurella multocida (the predominant organism in cat scratches/bites, causing rapid cellulitis within 12-24 hours) 2
• Staphylococcus aureus
• Streptococcus species
• Anaerobic bacteria

The hand location is particularly high-risk and warrants aggressive antibiotic treatment even for seemingly minor injuries 3.

Alternative Antibiotic Options

If the patient has a penicillin allergy 1:

• Moxifloxacin 400 mg daily (covers both aerobes and anaerobes as monotherapy)
• Doxycycline 100 mg twice daily (excellent activity against Pasteurella; some streptococci resistant)
• Ciprofloxacin or levofloxacin PLUS metronidazole (if using other fluoroquinolones, must add anaerobic coverage)

Critical Management Points

Wound care is essential alongside antibiotics:

• Surgical drainage and debridement if purulent drainage present
• Copious irrigation
• Hand elevation
• Close follow-up within 24-48 hours 3

Red flags requiring immediate surgical consultation:

• Deep puncture wounds (common with animal scratches/bites)
• Involvement of joints, tendons, or bone
• Signs of infection developing within 12-24 hours (typical for Pasteurella) 2
• Any hand wound presenting >24 hours after injury with infection

Common Pitfalls to Avoid

Do not use these antibiotics as monotherapy for animal scratches:

• First-generation cephalosporins (miss anaerobes and Pasteurella)
• Clindamycin alone (misses Pasteurella multocida) 1
• Trimethoprim-sulfamethoxazole alone (poor anaerobic coverage)

The hand location makes this high-risk - even minor-appearing scratches can lead to deep tissue infection, tenosynovitis, or osteomyelitis if inadequately treated 3, 2.

Tetanus Prophylaxis

Administer tetanus toxoid if the patient hasn't received vaccination within 10 years. Tdap is preferred over Td if not previously given 1.

Duration and Follow-up

• Standard duration: 7-10 days 1
• Mandatory close follow-up within 24-48 hours to assess response
• If infection worsens or fails to improve within 48 hours, consider admission for IV antibiotics (ampicillin-sulbactam 1.5-3.0 g every 6 hours) and possible surgical intervention 1