CapShield Maxx offers effective flea control for cats, lasting up to 30 days. It combines nitenpyram, which starts killing fleas within 30 minutes and clears the system in 24 hours, with Lufenuron, an Insect Growth Regulator (IGR) that disrupts the flea life cycle by preventing reproduction for 30 days. This tuna-flavored tablet is scored for easy dosing and proudly made in the USA.