Back to: Products CHERISTIN Cheristin Is a New Topical Flea Control For Cats. It Begins Killing Fleas within 30 minutes of Applying and last an entire month. It Kills 100% of the fleas within 12 hours and is Safe for Kittens 8 wks and older Base price for variant $109.00Sales price $116.63Sales price without tax $109.00Discount Tax amount $7.63Price / kg: