Itraconazole Dosing for Fungal Skin Infections
Standard Dosing by Infection Type
- The American Academy of Dermatology recommends itraconazole 100 mg once daily for 15 days for tinea corporis and tinea cruris, with the capsule formulation taken with food to optimize absorption 1
- The British Association of Dermatologists recommends itraconazole 200 mg daily for 12 weeks continuously for dermatophyte nail infections, as a first-line treatment alongside terbinafine 2
- Alternative pulse therapy for dermatophyte nail infections is 400 mg daily for 1 week per month, with 2 pulses for fingernails and 3 pulses for toenails, as recommended by the British Association of Dermatologists 2
Critical Administration Considerations
- The American College of Clinical Pharmacy recommends that the capsule formulation of itraconazole must be taken with food to ensure adequate absorption, with a significant decrease in efficacy when taken with H2 blockers, proton pump inhibitors, phenytoin, or rifampicin 1, 2
- The Infectious Diseases Society of America recommends checking serum itraconazole levels after at least 2 weeks of therapy to ensure adequate drug exposure, particularly for systemic infections 4
Special Population Adjustments
- The British Association of Dermatologists recommends that itraconazole is contraindicated in patients with hepatotoxicity or active liver disease, and that hepatic function tests should be monitored in patients with pre-existing abnormal results 2
- The American Academy of Pediatrics recommends a pediatric dose of 5 mg/kg per day for pulse therapy, with a maximum dose not exceeding 400 mg daily 2, 6
Treatment Failure Management
- The American College of Clinical Pharmacy recommends terbinafine 250 mg daily as an alternative oral therapy for treatment failure, or topical terbinafine 1% cream for localized disease 1
- The Infectious Diseases Society of America recommends increasing the dose to 200 mg twice daily for refractory cases, though this is typically reserved for deeper infections 3