Welcome to Pet Talk. I'm sorry to hear that Skinny is so sick. My cat Storm came from a shelter and he also had coccidia. I just gave him the meds that my vet prescribed and he was better in no time. I think the medicine was called Albon Suspension and it was a liquid. He had to take it 2 or 3 times a day for about 10 days. Goodluck. Please keep us updated.