Cat deworming includes internal deworming and external deworming. For internal deworming, you need to buy cat deworming medicine and give it to the cat. For external deworming, you need to buy cat deworming drops and put them on the cat. There will be no impact if these two kinds of deworming are carried out at the same time. You can buy medicine yourself or go to the pet hospital. Generally, deworming is done once every 1 to 2 months. It should be noted that the external repellent drops need to be dropped in a place where the cat cannot lick, such as the back of the neck. You can wear a hood on the cat to prevent the cat from licking the drug.