Not giardia, I think something related to salmonella. Enrofloxacin preloaded in little syringes, supposed to inject every 48 hours. He thought stress from shipping (got her a few months ago) weakened her immume system and let her gut flora get off balance, leading to the slow decline.
Oh, ok. That's the generic of Baytril. That's good that he gave you injectable rather than oral; they don't process it the same way mammals do, so injectable works better for their system. I'm sure he showed you how to do the injections, but be sure you angle downward enough, because when given just under the skin instead of in the muscle like it should be, it can cause skin damage and scarring.

I hope that is all that is going on with her! *fingers crossed*