Adults are treated with terbinafine 250 mg orally once a day for 2 to 4 weeks, which is more effective for endothrix infections, or itraconazole 200 mg orally once a day for 2 to 4 weeks or 200 mg 2 times a day for 1 week, followed by 3 weeks without the drug (pulsed) for 2 to 3 months.