I was looking over the vet bill and noticed he was given another injection called dexamethasone, which I did a lil research on and said it can be used for inflammation of the bowels.
As for the dewormer I was given panacur, which seems to be a safe and popular medication for use with Gardia. I need to check back with the vet to see if this was suspected and the reason it was given, although I was not told