There are many brands of deworming medication for cats, such as Advantage, Bayer, Frontline, Hydrance, and SuperFruits. These are all good brands. The best choice depends on the cat's condition and the owner's budget. Just choose the one that suits you best.

When starting to deworm your cat, it's recommended to do so continuously, generally once a month for three consecutive months. This aims to completely eliminate all parasites from the outset. After thorough deworming, you can adjust the deworming schedule based on your specific situation. If you don't have other pets in your home, and there are no rats, flies, or mosquitoes, then external and internal deworming once every three months is sufficient.