We've had a couple of bouts with ringworm. Our vet gave me a lotion called "Conofite" that I had to use on the affected areas once a day for 4-6 weeks. Baths weren't needed for the cats, but the dog got a bath! And we handled the cats with rubber gloves to prevent spreading it to us! It is so contagious and that was a trick to make sure all five cats didn't get it. And we washed all their blankets and sleeping pads regularly to prevent re-infection.
I don't think I would use a product for humans on my cats either. The Conofite lotion worked well and throughly- hopefully your vet can get it for you. It's a clear liquid, and only a few drops are needed per dose, so a little goes a long time.
Good luck.