Treatment of Toenail Onychomycosis
First-Line Treatment Options
- The British Journal of Dermatology recommends terbinafine as the first-line treatment for toenail onychomycosis caused by Trichophyton rubrum in adolescents, with a recommended dose of 250 mg daily for 12 weeks 1, 2
- Terbinafine is the preferred systemic treatment for dermatophyte onychomycosis, showing superior efficacy and lower relapse rates compared to other antifungals 4, 1
- For a patient likely over 40 kg, the appropriate dose is 250 mg daily for 12-16 weeks for toenail infection 1, 2
Monitoring Requirements
- Baseline liver function tests and complete blood count should be obtained before starting treatment, as recommended by the British Journal of Dermatology 1, 3
- Monitor for potential side effects including headache, taste disturbance, and gastrointestinal upset 1, 2
- Be aware that terbinafine can occasionally aggravate psoriasis and rarely cause a subacute lupus-like syndrome 1, 2
Alternative Treatment Options
- Itraconazole can be considered if terbinafine is contraindicated or not tolerated, with a recommended pulse therapy at 5 mg/kg/day for 1 week per month 1, 2
- Fluconazole can be considered as second-line if terbinafine and itraconazole are contraindicated or not tolerated, with dosing for adolescents at 3-6 mg/kg once weekly for 18-26 weeks for toenail infection 1, 2
- Griseofulvin has lower efficacy and higher relapse rates compared to terbinafine and itraconazole, and requires longer treatment duration 4, 1
Prevention Strategies
- The Pediatrics journal recommends careful and thorough drying between toes after showers, daily changes of socks, and periodic cleaning of athletic footwear to prevent toenail onychomycosis 5
- Use of foot powder after bathing has been associated with reduced rates of tinea pedis, as reported by the Pediatrics journal 5