Reviewed by Dr. Hannah Hart, DVM
Left untreated, parasite infections can weaken your cat’s immune system and wreak havoc on their digestion. Parasites can also cause symptoms such as a dull hair coat, low appetite, and belly bloating. Fortunately, cat dewormers are designed to target specific parasites and eradicate them so your cat can heal. Obtaining a proper diagnosis is key, however, so consult your veterinarian at the first sign of a parasite problem. Common symptoms include diarrhea, vomiting, bloody stool, weight loss, and constipation. Cat dewormers come in several forms, including the following:
While some cat dewormers don’t require a prescription, it’s wise to consult your veterinarian before treating your cat for parasites. Identifying the parasite is crucial, and your vet is the best person to recommend a course of treatment. Whether you’re dealing with an active infestation or trying to prevent one, a broad-spectrum preventive could be your cat’s best friend. Use Chewy’s Autoship to ensure your cat never misses a dose.
Most cats need dewormers when they are kittens—vets usually recommend treatments every 2–3 weeks until 6 months of age. Whether adult cats need deworming depends on their exposure and the use of preventive medications.
Many cat dewormers, including herbal remedies, are available over the counter, but some preventive medications require a prescription. Always consult your veterinarian before using any dewormer on your cat.
Over-the-counter dewormers can be effective for cats, depending on the active ingredient and the type of parasite. Cat dewormers that contain praziquantel (brand name Drontal) may be effective against tapeworms, hookworms, and large roundworms. Your vet can guide you on choosing the best dewormer for your cat.
Liquid dewormers can be good for cats who don’t like taking pills or who react poorly to topical treatments. Consult your vet before using a liquid dewormer, as some formulas may not be effective against certain types of parasites.
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