Best fast-acting Comfortis Chewable Tablets are fast-acting and good for cats that can't tolerate topical flea preventives. Spinosad, the active ingredient in Comfortis, starts to work within 30 ...

"Therefore, if you can’t tablet your cat, it’s not a good idea to commit to giving a flea tablet regularly, whereas if you’re likely to forget to give treatments, choosing a long-lasting ...