You need to prepare special anthelmintics for cats and household lice repellents. First, give the cat a bath to deworm the cat, otherwise there will always be lice in the house. It is best to do external deworming once a month. You can spray household lice repellent medicine at home, but the cat must be isolated when using it to prevent the cat from accidentally eating it and causing poisoning. It is best to do it when no one is at home, and then close the door of the house and let it sit for a day for better results.