Take the hassle out of flea infestations! Get rid of fleas fast with Cap Guard (nitenpyram). Compare to Capstan (nitenpyram), same active ingredient used in the vet channel.* Cap Guard is an oral flea control medication available over-the-counter to consumers like you. This easy-to-dose tablet begins working within 30 minutes. It cuts out the mess and does exactly what you need it to do: kills fleas fast! Give this effective and hassle-free product a try! Available for dogs over 25lbs, or for dogs and cats 2-25 lbs. *Capstan is a registered trademark of Novartis.