8 months (4 doses) flea treatment and prevention for indoor and outdoor cats and kittens over 9 lbs., 8 weeks or older Longer-lasting protection vs. other topical products;* 2 months protection per dose, outlasting the typical flea life cycle *Based on label claims Fast-acting treatment starts killing fleas within 30 minutes to 4 hours through contact Easy-to-apply topical treatment, no prescription needed Fragrance-free formula, containing a naturally derived ingredient Spinetoram - winner of a Green Chemistry award** **US EPA Presidential Green Chemistry Challenge. Designing Greener Chemicals Award. 2008.