Empiric Antibiotic Treatment for Surgical Site Infection After Failed Cephalexin

Rationale for Vancomycin

• The Infectious Diseases Society of America recommends vancomycin as empiric inpatient therapy for surgical site infections after failed cephalexin treatment, due to the high likelihood of methicillin-resistant Staphylococcus aureus (MRSA) infection 1, 2
• For incisional surgical site infections after surgery of the trunk or an extremity, the recommended empiric antibiotics include vancomycin, with a strength of evidence based on clinical guidelines 1, 3

Additional Management Considerations

Source Control

• The Infectious Diseases Society of America recommends obtaining wound cultures and Gram stain before initiating antibiotics to guide definitive therapy, though empiric treatment should not be delayed 2, 5
• Surgical debridement may be necessary if there is purulent drainage, marked local signs of inflammation, or systemic illness, as recommended by the Infectious Diseases Society of America 5, 6

Broadening Coverage

• The Infectious Diseases Society of America recommends considering adding gram-negative coverage with either ceftriaxone plus metronidazole, a fluoroquinolone (levofloxacin) plus metronidazole, or a carbapenem (ertapenem, meropenem) if the patient appears systemically ill 1, 4

Important Caveats

• The Infectious Diseases Society of America recommends that hardware-associated infections often require hardware removal for cure, not just antibiotics alone, and discussion with orthopedic surgery is necessary 2
• The American Academy of Pediatrics and the Infectious Diseases Society of America recommend avoiding fluoroquinolones and doxycycline as first-line agents in patients under 18 years old if alternatives exist 1, 3
• The Infectious Diseases Society of America recommends switching to piperacillin-tazobactam, ceftazidime, cefepime, or a carbapenem based on susceptibilities if cultures grow gram-negative organisms, particularly Pseudomonas 1, 3