Standard Duration for Fingernail Infections
Terbinafine tablets treat onychomycosis of the fingernails with a 6-week course, typically 250 mg daily.[1]
Standard Duration for Toenail Infections
For toenail onychomycosis, the standard course lasts 12 weeks at 250 mg daily, allowing time for nail regrowth.[1]
Durations for Other Fungal Infections
- Tinea pedis (athlete's foot): 2 weeks at 250 mg daily.
- Tinea cruris (jock itch) or tinea corporis (ringworm): 2-4 weeks.
- Tinea capitis (scalp infection): 4 weeks, often in children at adjusted doses.[1][2]
Factors Affecting Treatment Length
Doctors extend courses up to 16 weeks for severe toenail cases or if response is slow. Liver function tests guide continuation, as terbinafine requires monitoring.[1]
What Happens After Treatment Ends
Full nail clearance takes 3-6 months for fingernails and up to 12 months for toenails due to slow growth. Recurrence occurs in 20-50% of cases, sometimes needing retreatment.[2]
[1]: FDA Label for Lamisil (terbinafine)
[2]: Medscape - Terbinafine Dosing