does anyone know if it may take more than once to deworm a kitten, i have one 5 months old that has tapeworm again, after being given a worming pill by the vet at a little over 3 months old. They had given him a Drontil pill for the worms and said that would take care of it, and now at almost 5 months old have noticed them again. Just wondering how often you can get them wormed, and if it may take more than one dose of medication.