Clavamox doesn't seem like the right thing to go back to. Someone mentioned Zithromax. Is there a atomic bomb type antibiotic? Something that just knocks the crap out of the URI, but quickly? My thought is that any new thing to her system will aggravate the IBD, so if you have to introduce something, try to lessen it's course - I don't know if there is an antibiotic that has a shorter course by design.
When my vet prescribes Zithro, it is for one dose daily for 3 days, then 3 doses 3 days apart. In my experience, it knocks the crap out of URI quickly:). I like my vet to go straight to Zithro and he will, but I'm generally dealing with a particularly virulent form of shelter URI that will kill cats if messed around with, especially in kittens.
