Kills fleas within 24 hours and ticks within 48 hourFrontline is effective for 2 months against fleas and ticks for 1 month  The Number 1 choice of vets for fleas and Ticks Frontline spot on provides effective and convenient flea and tick control for dogs over 8 weeks and 2 kg. It is fast acting, long lasting, and waterproof. Applied to the back of the neck the product kills the parasites via contact rather than your pet's blood stream. Frontline spot on is spread throughout your pet by being absorbed into the skin and distributed with the natural oils all over their body. It contains Fipronil, which kills adult fleas within 24 hours and adult ticks within 48 hours of contact with pets. Plus, it also helps protect against reinfestation. Frontline Spot On be also be used for the control of infestations of biting lice.