Pet De-worming MedicineGive your pet cat the right cat worm medicine to get rid of roundworms and tapeworms. These medications are essential in keeping your pet cat's digestive system healthy and strong. Most cat worm medicines are sold without any prescriptions, but you may feel safer if you have the advice and approval of your veterinarian. To administer cat worm medicines that will help your pet get rid of harmful and possibly fatal intestinal parasites, you can simply feed these medications directly or mix them with your pet cat's regular food. At PetStore.com, these worming medicines come in tablets or liquid formulas that can effectively get rid of intestinal parasites without harming your pet cat's digestive system.