Frontline. Tri-act. Spot-on solution. Dog 20-40Kg. Fleas and ticks. Horse flies. Phlebotomists. Mosquitoes. 6 4ml pipettes Frontline Tri-Act Spot-on solution is intended for dogs from 20 to 40kg. 3 in 1 action: removes, treats, prevents. Frontline Tri-Act Spot-on is an anti-parasitic solution for the treatment and prevention of infestations by fleas, ticks, horseflies, sandflies and mosquitoes. Fleas are eliminated within 24 hours, preventing possible infestations in the 4 weeks following application. Frontline Tri-Act frees ticks within a maximum of 7 days, and those already present at the time of application will be eliminated within 48 hours. It also guarantees tick protection for over 4 weeks from the time of application. This medicine also repels mosquitoes for 4 weeks, sand flies for at least 3 weeks, and horse flies for more than 5 weeks after application.