Are you looking for an economical yet effective alternative to veterinarian only flea treatments for cats? Farnam Bio Spot on Flea & Tick Control For Cats & Kittens Under 5-lbs contains the same active ingredients as Frontline to kill fleas, flea eggs, and deer ticks. Bio Spot effectively breaks the flea life cycle and prevents flea re-infestation with etofenprox and methoprene for 30 days. This topical flea treatment for cats also kills and repels mosquitoes that may carry heartworm disease. Bio Spot Flea Treatment for cats is for use on cats over 5 pounds and 12 weeks of age.