Why use ivermectin on a PROTOZOAN!?!? Tell your vet he's a twit and walk away... Quickly. We use Albon for coccidia. It's oral and very inexpensive.

DO NOT use the Ivermectin. Your snake doesn't need it and the coccidia will still be there, because wow, they don't have a nervous system..

Go to another vet, ask for some Albon since your animal was diagnosed with coccidia. Tell them the weight. Mix the albon with water in a syringe and tube it down. No biggie. Red rubber feeding tubes work well as do cat catheters.

Shouldn't cost you more than $20... I'd recommend bleaching everything regularly until you get another fecal done and the snake is clear.