Homeopathy will at best do absolutely nothing and at worst kill your cat through negligence. Homeopathy is a pre-medicinal pseudoscience that believes that water can retain nondescript "vibrations" of an object, and these vibrations are stronger once diluted. They believe that if you make a homeopathic preparation...say of aspirin...that once you dilute the aspirin with water or alcohol to a concentration where it would take an entire swimming pool of water to find one molecule of acetylsalicylic acid then it is that much stronger. They also believe that "like cures like" so if you have bad allergies from ragweed pollen, they'll make a dilution of pollen to cure your allergies. It's been debunked by every legitimate large scale study and is contrary to the laws of physics and is a waste of your time and money. They are charlatans and taking advantage of you in your time of worry. Avoid them, I've had cats all my life and I don't want your love of your pet being used to scam your money away.