Farnam Bio Spot Flea and Tick Control for Cats Over 5 lbs - 3 Month Supply helps to kill and repels fleas, ticks and mosquitoes for up to 30 days. It also kills flea eggs up to one month and prevents infestation. Bio Spot Flea and Tick Control. Kills and repels fleas, ticks and mosquitoes for up to 30 days. Kills flea eggs up to one month and prevents infestation. Over 5 lb.