The active ingredient in Capstar, nitenpyram, works within 30 minutes and kills more than 90% of adult fleas in as little as four hours. It only protects for 24 hours, but it is safe to give daily ...

In pets with an active flea burden, a fast-acting oral medication like CAPSTAR (nitenpyram) may be in order to get rid of the fleas plaguing your pet. One dose of this flea treatment can start killing ...