Beaphar COMBOtec® Large Dog (20-40kg) contains a combination of Fipronil and the insect growth regulator (S)-Methoprene. As a result, a flea infestation is controlled more quickly. COMBOtec® kills fleas for 8 weeks and prevents new fleas in the environment during that period by preventing the development of eggs, larvae and pupae. Kills ticks for 4 weeks. Kills biting lice. Suitable for dogs with a weight of 20-40 kg and an age from 8 weeks. Safe to use during pregnancy and lactation.