True, but there's good reason for why this is expensive. I work in university research, which includes various phases of development of drugs both in the laboratory and clinical setting. Part of my job is ensuring proper compliance when it comes to animal protocols. When these drugs are developed, there are strict guidelines about how the animal subjects are assessed, what levels of pain are/aren't acceptable as part of the course of treatment, and what constitutes efficacy. To expand the uses and species, the entire testing process must begin over again because a separate study and protocol are needed for each added species/function. An interesting case study in original purpose v ultimate use is that eyelash-enhancing product called Latisse. It was originally developed as a potential aid for glaucoma but they found that the cosmetic benefit was extremely marketable, so it was reconstituted and retested as treatment for "insufficient eyelashes," whatever that is. Whenever a drug is re-purposed, it goes back through the trial phases to make sure it is safe for that new use.
When you use drugs for off-label or species not indicated, you don't have the assurance that these chemicals will interact with an animal's system such that the benefit outweighs the harm. Your personal observations as a wildlife rehab specialist give you great insight into how medications can be beneficial to other species but as a general rule, I think it best to use drugs only as prescribed and for the correct species. That's it for me on the subject, back to the lovely chickens.
When you use drugs for off-label or species not indicated, you don't have the assurance that these chemicals will interact with an animal's system such that the benefit outweighs the harm. Your personal observations as a wildlife rehab specialist give you great insight into how medications can be beneficial to other species but as a general rule, I think it best to use drugs only as prescribed and for the correct species. That's it for me on the subject, back to the lovely chickens.