Welcome to the site, Stephanie. I am so very, very sorry of your loss of sweet Maggie. I agree with Mr.Blanche who posted early on that without a post mortem, we will never know for sure. I wonder also, if there was an allergic reaction to the antibiotic and would like to know what it was called too. It is so extremely devastating to loss a beloved kitty and not have a definitive answer as to why. My heart goes out to you during this time and know that we care. :heart3: