Can Bactroban (Mupirocin) Be Used on Open Wounds?
Yes, Bactroban (mupirocin) can be safely and effectively applied to open wounds, particularly for treating or preventing infection with Staphylococcus aureus, including methicillin-resistant strains (MRSA). 1
FDA-Approved Application
- Mupirocin cream should be applied to the affected area 3 times daily for 10 days, with the treated area optionally covered with gauze dressing. 1
- Patients not showing clinical response within 3-5 days should be re-evaluated. 1
Clinical Indications for Open Wounds
Primary Uses
- The Infectious Diseases Society of America recommends mupirocin 2% ointment as the evidence-based first-line topical antibiotic for impetigo and superficial skin infections, applied three times daily for 5-7 days with clinical efficacy rates of 71-93%. 2, 3
- Mupirocin is specifically effective against S. aureus (including MRSA) and S. pyogenes, the most common pathogens in open wounds. 2
Wound Types Where Mupirocin Excels
- For contaminated traumatic wounds and lacerations, mupirocin should be considered after thorough irrigation and debridement if infection develops or for patients with limited superficial lesions. 3, 2
- In burn wounds infected with MRSA, mupirocin demonstrates 98.3% reduction in viable organisms within 36 hours and achieves bacterial clearance rates of 88.8%. 4, 5, 6
- For crush-contaminated wounds, mupirocin shows superior antibacterial activity against both S. aureus and S. pyogenes compared to other topical agents. 7
When to Use Mupirocin vs. Systemic Antibiotics
Topical Therapy Appropriate When:
- Limited number of lesions present 3
- Superficial infection without systemic signs (temperature <38.5°C, WBC <12,000 cells/µL, pulse <100 beats/minute) 3
- Erythema extending <5 cm from wound margins 3
Switch to Systemic Therapy When:
- No improvement after 48-72 hours of topical treatment 2
- Systemic symptoms develop (fever >38.5°C, tachycardia >110 beats/minute) 3, 2
- Erythema extends >5 cm beyond wound margins 3
- For presumed MSSA: use dicloxacillin 250 mg four times daily or cephalexin 250-500 mg four times daily 2
- For suspected/confirmed MRSA: use clindamycin 300-450 mg three times daily or trimethoprim-sulfamethoxazole 1-2 double-strength tablets twice daily 2
Important Caveats and Limitations
Wound Size Restrictions
- Mupirocin should only be used on burns <20% total body surface area, as safety and efficacy in larger burns have not been established. 8
- The polyethylene glycol base in mupirocin can be absorbed through damaged skin and may cause renal toxicity in extensive wounds. 8
Resistance Considerations
- Mupirocin should be applied for a limited period of 5 days to minimize resistance development. 8
- High-level mupirocin resistance (mediated by mupA and mupB genes) is increasingly reported worldwide, though current resistance rates remain acceptable for clinical use. 9
- In Far North Queensland, mupirocin resistance was found in only 10.4% of MRSA isolates, supporting its continued use for MRSA decolonization. 10
Optimal Wound Care Protocol
Initial Management
- Irrigate thoroughly with warmed sterile water, saline, or dilute chlorhexidine to remove debris and reduce bacterial load. 2
- Debride devitalized tissue and remove foreign bodies before applying mupirocin. 2
Application Technique
- Apply mupirocin 2% ointment three times daily directly to the open wound. 3, 1
- Cover with nonadherent dressings such as Mepitel or Telfa to prevent trauma during dressing changes. 2
- Alternatively, apply a greasy emollient (50% white soft paraffin with 50% liquid paraffin) over the wound if infection is not present. 2
Monitoring
- Evaluate within 48-72 hours for signs of infection including increasing pain, erythema, swelling, or purulent drainage. 11
- Take wound swabs for culture if infection develops to guide antibiotic selection. 2
Additional Benefits Beyond Antibacterial Activity
- Mupirocin stimulates human keratinocyte proliferation and enhances production of growth factors (hepatocyte growth factor, M-CSF, PDGF-AA, EPO) involved in wound healing. 12
- This dual mechanism—antibacterial plus wound healing promotion—makes mupirocin particularly valuable for open wound management. 12