How long does terbinafine take to cure toenail fungus?
Last updated September 3, 2026.
Months: terbinafine tablets typically run up to 3 months, and the NHS says some nail infections take 6 months or longer - because the drug clears the fungus long before the damaged nail can grow out. The ugly nail is dead keratin; it only looks normal as clean nail grows from the base, and a big toenail takes about a year to replace. Judge by the clear band at the cuticle, not the tip. Rules: take the full course (stopping early because it looks unchanged is the classic failure); big-toe infections clear slowest; expect liver-function checks on long courses - report dark urine, pale stools, or yellowing skin promptly. Treat any athlete's foot at the same time, or it reinfects the nail. Pymander is a free AI doctor, 24/7 by text, and can help you judge your progress.
What to do
- Photograph the cuticle monthly: the clear band is the progress bar.
- Finish the prescribed course: looks-unchanged is normal mid-treatment.
- Report liver-warning symptoms: dark urine, pale stools, yellowing.
- Treat the athlete's foot too: skin fungus reinfects nails.
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