I am also sorry that I didn't mention, more clearly, why not to go with another penicillin. I don't want to "dog" your vet... and I would give him/her a pass on trying a second kind (since so many think it is normal for cats to barf)... but a third..convenia no less?
To be fair, we didn't know he couldn't handle that class of drugs until we tried the clavamox and amoxicillin. Originally she wanted to go with the Convenia, but that was before we tried the other 2 (those were my idea--I was looking for alternatives and had no idea clavamox and amoxicillin were related, though you would think the vet would have thought of that
). I would bet, though, that she'd say the Convenia would be fine because since it's an injection, it's bypassing the GI tract so it would be tolerated. Maybe it would, maybe it wouldn't. Bottom line: I have a problem with any medication that's in the body for 65 days, because if he should have a reaction to it, there's no getting it out of his system. The possible side effects are nothing to ignore, either.
I think I read about the retinal issue in Baytril, but if I remember correctly, that was on very high doses, which are not recommended.
The holistic vet mentioned Baytril and clindamycin, but favored the Baytril. I think she said the clindamycin cat doses were liquid (which Pookie won't allow) and she wasn't sure it came in a tablet form for cats in an appropriate dosage, but I could have misunderstood what she said (I didn't get a lot of sleep last night).
Thank you all, so much. You have no idea how much I appreciate your input and support.