You may wish to listen to the episode on http://www.blogtalkradio.com/reptileradio with Dr. Scott Stahl. He specifically addresses RI's and how if you've not seen improvement after a certain amount of time, it's time to consider a different course of treatment. You may even want to direct your vet to it. Dr. Stahl is considered the leading herp vet in the world.

Here's the direct link to the show: http://www.blogtalkradio.com/reptile...ile-Veterinary