How Does Cat Dewormer Work?

by Alex Kountry
Updated on

A common question we get here at the clinic is “How does cat dewormer work?” Let’s break it down for you!

Checkout this video:


Dewormers are drugs that are used to treat infections by worms. These drugs work by either killing the worms or preventing them from being able to reproduce. Dewormers can be used to treat a wide variety of worm infections, including roundworms, tapeworms, and hookworms.

Types of dewormers

There are many different types of dewormers available. Some are designed to kill only one type of worm, while others are effective against multiple types.

The most common type of dewormer is an oral medication. These can be in the form of a pill, liquid, or granules that you mix with your cat’s food. Most oral dewormers work by paralyzing the worms, which eventually leads to their death.

Injectable dewormers are also available and are typically administered by your veterinarian. These dewormers work quickly and are effective against a wide range of worms. However, they can be more expensive than oral medications and may require a trip to the vet.

Topical dewormers are applied directly to your cat’s skin and spread over their body. These dewormers work by killing the worms that come into contact with them. Topical dewormers are typically less expensive than injectable medications, but they may not be as effective against all types of worms.

How dewormers work

Most dewormers work by either killing the worms directly or causing them to be expelled from the body. Some dewormers, such as pyrantel and fenbendazole, work by directly paralyzing the worms so they can no longer cling to the intestine walls. As a result, they’re passed out of the body in your cat’s feces. Other dewormers, such as milbemycin and ivermectin, work by causing an imbalance in the worm’s nervous system. This makes it difficult for them to maintain their grip on the intestine walls and they’re eventually passed out in your cat’s feces.


Cats are common pets in many households. But did you know that they can get worms? Just like any other animal, cats can get worms from eating contaminated food or water, or from contact with infected soil or other animals. The good news is that there are products available to help prevent and treat worm infections in cats.

The feline digestive system

The digestive system of a cat starts with the mouth. Here, special teeth called incisors and canines help to tear food. There are no molars or premolars. Cats do not chew their food; they gulp it down whole.

The esophagus is a muscular tube that moves food from the mouth to the stomach. The stomach is small and sac-like. It has a muscular wall that churns and breaks down food with digestive juices. The small intestine is coiled and is much longer than the stomach. It continues the process of breaking down food with digestive juices and also absorbs nutrients into the bloodstream.

The large intestine is much shorter than the small intestine, and its main function is to absorb water from indigestible materials (waste products). The waste products leave the large intestine as feces and move into the rectum where they are stored until elimination.

Common types of worms in cats

There are four common types of worms that can infect cats:
-Roundworms: The most common type of worm in cats, roundworms are usually transmitted to kittens from their mothers while they’re still in the womb. Outdoor cats can also become infected by eating infected prey, such as rodents.
-Hookworms: Hookworms are tiny, threadlike worms that attach themselves to the lining of the intestine and feed on blood. Cats can become infected by hookworms through contact with contaminated soil or by eating infected prey.
-Tapeworms: Tapeworms are long, flat worms that live in the intestines and are usually transmitted to cats when they consume an infected flea. Outdoor cats are at greater risk for tapeworm infection since they’re more likely to be exposed to fleas.
-Whipworms: Whipworms are thin, threadlike worms that live in the large intestine and cecum (a pouch at the beginning of the large intestine). Cats become infected with whipworms when they consume contaminated soil or water.

Cat Dewormer

Cats can get worms from eating infected prey, coming into contact with contaminated feces, or from their mother if she has worms. The most common type of worms in cats are roundworms and tapeworms. These parasites can cause weight loss, diarrhea, vomiting, and anemia in your cat. Dewormers work by killing the worms in your cat’s digestive system.

How cat dewormer works

Deworming medication will either kill the worms directly or make them unable to attach to your cat’s intestine. This will cause the worm to be passed in your cat’s stool. Your cat may need more than one treatment to make sure all the worms are gone. Talk to your veterinarian about how often to treat your cat.

Deworming your cat

Deworming your cat is an important task for pet parents. After all, cats can get worms, and these parasites can cause a variety of health problems.

Fortunately, there are a number of products on the market that can help you get rid of the worms your cat has. But how do they work, and are they effective?

Simply put, cat dewormers work by killing the worms that are in your cat’s system. Some dewormers will also help to expel the worms from your cat’s body.

Most dewormers are safe and effective, but it’s always a good idea to talk to your veterinarian before using any type of medication on your pet. They can help you choose the right product for your cat’s individual needs.

Photo of author

About the author

Alex Kountry

Alex Kountry is the founder of HayFarmGuy and has been a backyard farmer for over 10 years. Since then he has decided to write helpful articles that will help you become a better backyard farmer and know what to do. He also loves to play tennis and read books


HayFarmGuy - Get Info About Farm Animals in Your Inbox

Leave a Comment