I have also used it on pancakes with no problems. I wasn't aware of any tortoises that can't have it, and I have used it on leopards also with no apparent problems. I think the issue is when it's injected multiple times into the same spot, you can imagine that area would get pretty irritated after the second time. I typically use it orally.
Some keepers prefer Flagyl and Metacam over Baytril. One experienced boxie keeper reported red tissue growing around the injection area after she used Baytril. Then again, that's just my 2 cents. Many keepers use it without any major side effects.