Thanks guys!! I went out on my dinner hour (I work nights till 9 p.m. on Tuesdays) and got his prescription for Zythromax. I went home and gave it to him. The poor little guy (all 16 pounds of him!!) saw me coming with the syringe of bubblegum flavored liquid and let out this cry like "Oh no, not again!!!" Fortunately I only have to medicate him once a day. The vet said the Clavamox was the stuff that made him vomit (it's a common side effect). I'm keeping my fingers crossed that this works. I wonder if cats like bubblegum flavor . He didn't spit it up so that must be a good sign. *sigh* I can't wait till this whole ordeal with over. Mommy needs a break (and a good stiff drink )