RXJ CapShield Plus Feline (Capsule) is a skin supplement designed to provide extended flea protection for kittens and cats. This formula combines Nitenpyram for fast-acting flea control with Lufenuron, an insect growth regulator (IGR) that remains in the bloodstream for up to 30 days. Lufenuron helps prevent newly feeding fleas from reproducing, interrupting the flea life cycle after the initial treatment period. CapShield Plus offers a unique way to introduce long-term IGR protection directly into the animal’s environment, especially beneficial since sunlight rapidly breaks down IGRs used in yard sprays. Made in the USA, it is an excellent option for both indoor and outdoor cats.