Beaphar COMBOtec Cat contains a combination of fipronil and (S)-methoprene (an insect growth regulator). This will bring a flea infestation under control faster. COMBOtec kills fleas for 4 weeks and prevents new fleas in the environment for 6 weeks by preventing the development of eggs, larvae and pupae. Kills ticks for 2 weeks. Kills biting lice. Suitable for cats weighing from 1 kg and 8 weeks of age. Safe to use during pregnancy and lactation.