There are no approved treatments for cryptosporidiosis.

I raised exotic birds for 20+ years and that is how I found out about "crypto". There are several wasting syndromes in birds. I had a bird that started showing signs of it. Normal testing at the vets were negative. I had the vet put it down and do a post mortem checking for any and all parasites. The results were "Proventricular Cryptosporidiosis". Crypto can only be detected with special tests. Crypto can spread in water, droppings, and be passed through eggs. Some healthy looking animals can be carriers.

Stress (egg laying, shedding, etc.) can trigger an outbreak even if the parasite is normally held in check in the animal's system. I found that amprolium (coccidiastat) can be used to treat crypto. It cost about $70 a gallon (Corid 9.6% solution is a ready-to-use formulation of amprolium). It was primarily used for treating cattle, but now is used for most animals. I used 1-1/2 ounces per gallon of water for my birds but geckos don't drink enough. When the birds would not drink much, I also used a few drops of Corid mixed with multi-vitamin powder squirted into the mouth (beak) everyday for 2-3 weeks. Amprolium is a thiamine antagonist, so you need to replace the vitamin B.

The African Love Bird Society (ALBS) published an article I wrote on the subject about 15 years ago. It worked in my birds.

Please take notice that I am not a vet, and I recommend you discuss this with your vet.
-----
BigSurf
www.SurfinBird.com
Robert@SurfinBird.com