Parasites are tiny microorganisms. Generally, owners cannot spot parasites on their cats with the naked eye. But parasites are truly terrifying. I've heard of some girls who got parasites from their cats and even developed neurosis. So, deworming your cat is absolutely essential! 
Do cats need to be dewormed regularly? Normally, cats should be dewormed twice a year. It's essential to choose a broad-spectrum deworming medication specifically formulated for cats and to strictly follow the instructions. Never use human deworming medication, as it can be toxic and could poison your cat instead of deworming them. Commonly used deworming medications for cats include praziquantel (used to treat tapeworms) and levamisole (used to treat roundworms).
Do you need to determine the dosage for deworming cats? Of course, you should refer to the instructions on the medication. For example, the dosage for Remigao deworming medication is one tablet per 5 kilograms. For external deworming medications, it is recommended to spray 6-8 times per kilogram for short-haired cats and 10-12 times per kilogram for long-haired cats.
Of course, before deworming your cat, you should have it checked out first, and then ask a veterinarian to prescribe deworming medication. Note that there are many deworming medications for cats on the market. When choosing a deworming medication, be sure to purchase it from a reputable veterinary clinic, and do not try to save money by using other deworming medications as substitutes.