My daughter had success with Vick's Vapo Rub, but it must completely cover the nails and be used faithfully every day (and night?), for months, until the infected nail grows out. But no worries about liver effects. I don't know if a generic would also work.
My sister-in-law, who used the prescribed pills successfully, said that unfortunately, the fungus came back after a while. Apparently that is not uncommon.
If I had this problem I'd try Dr. Pauls or the VapoRub first, if you can manage one of those.
CCSVI: Making Sense of MS