Itraconazole capsules are an antifungal medicine used to treat various fungal and yeast infections, such as nail fungus (onychomycosis), oral thrush, esophageal candidiasis, and systemic fungal infections like aspergillosis, blastomycosis, and histoplasmosis What it treats (common uses)Itraconazole capsules are mainly used for:Fungal nail infections (onychomycosis)Toenails (with or without fingernail involvement): 200 mg once daily for 12 weeks .Fingernails only: 200 mg twice daily for 1 week, then stop for 3 weeks, then repeat the 1‑week course (pulse therapy) .Oral and esophageal candidiasis (thrush)Oropharyngeal (mouth/throat): 100–200 mg once daily for 1–2 weeks .Esophageal: 100–200 mg once daily for at least 3 weeks, and continue for 2 weeks after symptoms resolve .Systemic fungal infectionsAspergillosis, blastomycosis, histoplasmosis, and other deep fungal infections: usually 200 mg once or twice daily for several months (often at least 3 months) .For life‑threatening infections, a higher “loading dose” (e.g., 200 mg three times daily for 3 days) may be used initially, then reduced to the maintenance dose