They will do a liver profile to see if Lamisil is contrainidicated.
My podiatrist put me on it 1 week on, 3 weeks off. No problems, and my nails look great.
The OTC stuff is worthless.
As a physician, +1 for this comment & Dr. Rroof's.
Many dermatologists prescribe lamisil 250mg, one week, then 3 weeks off and repeat. I do the same. Lamisil tablet is generic now & cost you little. It is a fungal "infection," so don't get discouraged if it comes back again and again.
We stopped doing the liver blood test altogether, as the liver injury happens in about one in 100,000 patients. Super rare, in other words.
Topical antifungal... it's better than nothing, but it only treats minor cases. Just don't spend a lot of money on it. I should mention that trimming the bad nails also helps a lot.