Terbinafine
"Took daily for 3 months.  Worked like a charm!  Tips 1) Hang a calendar in bathroom as a reminder to take pill. 2) Buy a multipack of cheap nail files.  File the top nail surface as low as you can get it.  Repeat often with new file 3) Keep them trimmed as short as you can.  Clean clippers with alcohol between uses. 4) Use a secondary treatment for nail surface. I tried a liquid that you brush on, cream, or use coconut oil/tea tree mixture 2x day.  5) Soak feet 2x month in vinegar/listerine to remove dead skin & kill fungus.  Using this method, my nails have no sign of fungus 1 year later.  No more pain or itch.  I continue the coconut/tea tree daily and soaks 2x month."