Trifexis **RX (Spinosad & Milbemycin) 6 Doses
Spinosad, an active ingredient in Trifexis, starts to work within 30 minutes to kill fleas and has been proven to kill 100% of all biting fleas within 4 hours. Trifexis also kills flea eggs before they can mature, which helps to end the flea life cycle. Trifexis prevents heartworm disease by killing microfilariae and larvae from maturing into adult heartworms. RX - Heartworm Prevention requires that a heartworm test be taken within the past year in our facility.