Itraconazole Pharmacology: Dosing and Duration for Fungal Infections

Dosing by Infection Type

The National Comprehensive Cancer Network recommends itraconazole dosing varies significantly by infection type and severity, with most systemic infections requiring 200 mg once or twice daily for 6-12 months, though therapeutic drug monitoring is essential to ensure adequate exposure with target trough levels of 1-2 mcg/mL for invasive infections and >0.5 mcg/mL for prophylaxis 1
For oropharyngeal candidiasis, the Journal of Microbiology, Immunology and Infection suggests 200 mg once daily for 7-14 days for uncomplicated disease 2, 3, 4
For esophageal candidiasis, the Journal of Microbiology, Immunology and Infection recommends 200 mg once daily for 14-21 days until clinical improvement 2, 3, 4, 6
For blastomycosis, Clinical Infectious Diseases suggests 200 mg three times daily for 3 days (loading dose), then 200 mg once or twice daily for 6-12 months 7
For moderately severe to severe blastomycosis, Clinical Infectious Diseases recommends initial amphotericin B for 1-2 weeks until improvement, then step-down to itraconazole 200 mg three times daily for 3 days, then 200 mg twice daily for total duration of 6-12 months 7

The National Comprehensive Cancer Network recommends target trough concentrations of >0.5 mcg/mL for prophylaxis and 1-2 mcg/mL for active invasive infection 1
The National Comprehensive Cancer Network suggests measuring serum levels after at least 2 weeks of therapy to ensure adequate drug exposure 1
Clinical Infectious Diseases recommends measuring serum levels after at least 2 weeks of therapy to ensure adequate drug exposure 7

For immunocompromised patients, Clinical Infectious Diseases suggests initial therapy with amphotericin B for 1-2 weeks until improvement, then step-down to itraconazole 200 mg three times daily for 3 days, then twice daily 7
For CNS infections, Clinical Infectious Diseases recommends itraconazole 200 mg 2-3 times daily for at least 12 months and until resolution of CSF abnormalities 7