Hi all, I periodically give my three cats Echinacea drops that can be brought at most chemists or health stores. It is natures antibiotic and has also cleared up ear infections and mouth ulcers which one of my cats is prone to. They are totally safe, i give them the childrens dose. As your vets they are fine to give them its brilliant. My friend had a cat that had this awful cold, no word of a lie i have never seen a cat have a cold this bad, she had forked out over £200 in vets fees and nothing had worked. I told her about Echinacea and she tried it, within a week her cat was better. Of course seek medical advice if your cat is poorly, but you can give these drops as a preventative measure if your cat is prone to mild things..