Why use Fluvicin?

Question
I have two kittens (approx 12 weeks) with ringworm; one has
chronic URI, but both have tested FELV/FIV negative.  The vet
insists on using Fluvicin, but I'm concerned about possible side
effects.  I've read that ringworm is normally self resolving after
two months, and it takes almost that long for the fluvicin to
work.  I consider ringworm to be superficial.  What should I risk
using fluvicin for a superficial, self-resolving condition?  My vet
said because it's zoonotic, but I've already gotten it, and the
kittens won't be around anyone else.  If you agree that I need to
use systemic therapy, would terbinafine be a safer choice?
Thanks for your input.
Heather  

Answer
The problem is that if you don't kill the spores, then every hair that falls out of the kittens will be a reservoir for re-infection. I'm not certain if I agree that it is a self-limiting infection.  Many of the systemic antifungals can reduce sporulation as well.  I recommend sporanox (itraconazole) for systemic treatment.  I have never used terbinafine.