Zodiac Spot On II for Cats & Kttens KILLS flea eggs before they hatch REMAINS effective for up to 4 weeks Easy to use and economical. Spreads over complete body through natural motion of animal. Breaks the flea life cycle. Provides relief from flea infestations for up to 4 weeks. Prevents flea population build up in your home. Once-a-month Topical Treatment for Cats offer an easy to use, effective and economical alternative. These products are designed to use once a month. 4 Month Supply ALWAYS READ AND FOLLOW THE LABEL INSTRUCTIONS BEFORE USING OR APPLYING ANY PEST CONTROL PRODUCTS. Do not use on cats or kittens under 12 weeks of age. If signs of sensitivity occur, bathe your pet with mild soap and rinse with large amounts of water. To Apply: (read entire instructions on carton label) Prior to application of the product, gently lift the cat's haircoat on the back of the neck at the base of the skull, position the tip of the applicator on the cat's exposed skin and squeeze out the entire contents of the applicator onto the cat's skin.