Internal deworming can begin after kittens are three months old. It's recommended to deworm kittens monthly, and adult kittens every three months. Common internal parasites include roundworms, tapeworms, and hookworms. Infection can easily cause diarrhea, weight loss, and lethargy in cats. Therefore, preventing parasite infections is crucial, and owners are advised to deworm their cats regularly. 
What to pay attention to when deworming your cat:
1. Observe your cat's feces after deworming. A few days after deworming, dead parasites and eggs will usually be excreted in the stool. If diarrhea occurs, it is best to consult a veterinarian.
2. Do not use flea collars for external parasite control. Most flea collars are made with dichlorvos, which is highly toxic and very harmful to cats.
3. Dosage of deworming medication for cats. Deworming medication is toxic, so it is essential to administer it according to the instructions, especially for domestically produced deworming medications. Always weigh your cat before administering the medication and calculate the dosage based on their weight. Sometimes there may be leftover medication; if you feel it's wasteful, you can give it to stray cats.
