Management of Infected Ingrown Toenails

Appropriate Antibiotic Selection

The American College of Physicians recommends cephalexin as the initial antibiotic choice for infected ingrown toenails, providing coverage for the most likely pathogens, primarily Staphylococcus aureus 1
The American College of Physicians suggests switching to sulfamethoxazole-trimethoprim (Bactrim) if initial treatment fails or if MRSA coverage is specifically needed, providing broader coverage including methicillin-resistant Staphylococcus aureus 1
The American College of Physicians recommends Augmentin (amoxicillin-clavulanate) 500 mg/125 mg every 12 hours for mild to moderate paronychia, which can accompany ingrown toenails 2

The American Diabetes Association recommends confirming signs of infection, such as purulent drainage, significant erythema or cellulitis, and pus or abscess formation, before proceeding with antibiotic treatment for Staphylococcus aureus 3
The presence of purulent drainage, significant erythema or cellulitis, and pus or abscess formation are indicators of infection that require antibiotic coverage 3

Up to 25% of ingrown toenail cases develop secondary bacterial or fungal superinfections, and if the patient is not responding to initial antibiotic therapy, consider fungal cultures and potential antifungal treatment 1, 2
The Infectious Diseases Society of America recommends obtaining bacterial cultures before starting antibiotics, especially in severe cases or treatment failures, to guide appropriate antibiotic selection 2, 1

Warm antiseptic soaks with dilute vinegar (50:50 dilution) or 2% povidone-iodine for 10-15 minutes twice daily, in combination with antibiotics, are recommended for infected ingrown toenails 3, 1
The International Working Group on the Diabetic Foot (IWGDF) emphasizes that ingrown toenails in diabetic patients require immediate treatment by a trained healthcare professional due to the risk of progression to foot ulceration with significant morbidity 4, 5, 6, 3

The American Academy of Family Physicians recommends cephalexin (Keflex) 500 mg orally every 12 hours for 10 days as the standard adult dosing for infected ingrown toenails 7
For penicillin-allergic patients, cephalexin should be avoided, and clindamycin 300 mg three times daily for 10 days can be considered as an alternative 7