Top 5 Best Cat Dewormers [2020 Buyer’s Guide]

image of an ill kitty

Worried about worms?

If you regularly give your feline friend preventative parasite medication that protects against heartworms, you’re probably not too worried, and you’ve certainly lowered her risk of becoming infested.

But even the best prevention routine doesn’t guarantee that your pet is 100% safe from worms—especially because there are so many different kinds lurking out there in the world!

That’s right: unfortunately, there are more bothersome buggers than just heartworms.

In this review, we get into an in-depth discussion about common types of worms to look out for, how dewormers for cats work, and how to know if you’re selecting the right deworming medicine for your animal if she does end up infested.

The Most Common Types of Worms

Many different types of worms can get into your cat’s body. Worried your cat may have them? Check out some of the most common ones diagnosed and treated by veterinarians:


image of a roundworm

Full grown roundworms reach about 3 to 6 inches in length and first infest a cat’s intestines. As they grow, reproduce, and hatch, roundworms can spread to other organs via the bloodstream including the liver and lungs.

Roundworms can enter a cat’s body while still in their larval stage (as eggs). These parasitic eggs are found in wildlife like rodents and birds, which outdoor cats like to hunt and kill, as well as the soil and the feces of infected animals. Even indoor cats can get roundworm however, especially kittens who can become infested by drinking the milk of an infected mother.

Humans can get roundworms from their infected cats, too! Early diagnosis and treatment is essential for protecting the entire family.

Symptoms of roundworms in cats include:

  • Vomiting
  • Diarrhea
  • Severe constipation
  • Decreased appetite
  • A dull coat
  • The appearance of worms (small spaghetti-like strings) in kitty stool or vomit
  • In kittens, their bellies can become enlarged and hard, but the rest of their bodies look thin due to malnourishment from the worms invading their intestinal tract


image of a tapeworm

These intestinal parasites get their name because unlike roundworms, tapeworms are flat and segmented. As they mature, some of these segments break off the tapeworms and are passed in the stool. They can get into your cat’s system if your kitty drinks water or consumes animal feces that’s been infested with tapeworm eggs, or if she eats tapeworm infested fleas (the most common method of infestation), rodents, and birds.

Tapeworms primarily affect the intestines and can lead to a medical condition known as cestodiasis. Symptoms of tapeworms in cats include:

  • The appearance of little white tapeworm segments in the feces or on the hair around your pet’s anus (they resemble little grains of rice or sesame seeds)
  • Excessive licking and biting of the anus
  • Dragging of the bottom across the floor (itchy, itchy, itchy!)


image of a hookworm

Hookworms also love to live in the intestines of cats and other host animals. These parasites will bite and suck blood from the intestinal walls, causing inflammation, intestinal bleeding, and anemia. Kittens can get hookworms through their infested mother’s milk, and cats can also become infected by coming in contact with hookworm larvae (found in soil, sand, litter, or water contaminated via exposure to feces from an infected animal).

These parasites are particularly harmful and potentially fatal in kittens, so early detection is key. Symptoms of hookworms in cats include:

  • Lesions and sores on the paw pads (where their feet come in contact with infected soil, etc.)
  • Stool that looks dark and tarry
  • Diarrhea
  • Constipation
  • Poor appetite
  • A generally unwell appearance, with paleness in its nostrils, lips, and ears

If hookworms get into the lungs via the bloodstream, persistent coughing can occur. Sudden death can occur if left untreated!


As their name implies, lungworms are parasites that can infect a cat’s lungs, which can lead to severe breathing difficulties. A cat may become infested if they consume lungworm larvae, typically found within contaminated water or infested rodents and animals.

Symptoms of lungworms in cats include:

  • Coughing
  • Wheezing
  • Shortness of breath and/or difficulty breathing (respiratory distress)
  • Fluid build up in the lungs

What is a Cat Dewormer?

A cat dewormer is a type of medicine that kills the adult and larvae of parasitic worms. There are several different types of prescription and over the counter dewormer for cats available on the market. They are typically administered orally in pill or liquid form, and contain chemical deworming agents including:

  • Pyrantel Pamoate
  • Piperazine
  • Praziquantel

Choosing the Best Dewormer for Cats: A Simple & Thorough Guide

The best cat dewormer will offer several features:

  • Effectiveness: will it thoroughly kill the worms which have infested your animal? Also, how quickly will the medication work? Some dewormers take weeks to take full effect, and in other cases pet owners have seen results within a matter of hours.
  • Safety: are there minimal to no side effects for your pet? Common side effects to look out for include excessive drooling, lethargy, lack of appetite, and diarrhea or vomiting.
  • Ease of Administration: is it easy to give to your pet? (This may be particularly animal-specific, if your pet is finnicky about pills and doesn’t fall for tricks like treat-covered or food-covered pills!)

To make sure you find the best dewormer for cats in your life, we’ve reviewed several products on the market to help you make the right choice for your four-legged furball!

You love what you see? Purrfect! Rest assured that I put these products on the list specifically due to their genuine quality and not for other reasons.
I would just like to be transparent with you and inform you that FelineLiving may obtain a share of sales or other monetary compensation from the links on this page. I hope your furry friends will love these reviewed products and that it will spark joy in each pair of feline eyes!

Mary Nielsen ♥

Top 5 Best Dewormers for Cats Reviews

There are many choices out there when it comes to dewormers for cats. Some of them require a prescription from your veterinarian—but even if your pet insurance covers it, you still have to pay for the vet visit, too!

And if worm infestations occur frequently in your animal, this could add up to a lot of money in vet bills over the years! We’ve done some research to find some of the best over the counter dewormers for cats so you can opt to purchase without having to visit the vet first.

Bayer Tapeworm Dewormer

This cat dewormer contains the medication praziquantel which is known to be highly effective for killing tapeworms. Many users note that it’s cheaper than over the counter dewormers for cats and appears to work just as effectively. This is particularly appealing to many cat parents because tapeworms are super common following flea infestations!

Pet parents who’ve used it also report that they notice little to no side effects. Simply mash up the tablet and mix it into their food.

Bayer Tapeworm Dewormer (prazquantel tablets) for Cats, 3 tablets
  • Easy effective way to remove common tapeworms
  • Tablets may be crumbled and mixed with food or taken by mouth
  • For use in cats over 6 weeks of age
  • From Bayer, for use in cats over 6 weeks of age

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

  • Pros:
    • Affordable
    • Effective
    • Minimal to no side effects
    • Available without a prescription
    • Easy to administer to cats who aren’t overly picky with their food
  • Cons:
    • Not safe to use in cats less than 6 weeks old
    • Only treats tapeworm infestations

Bayer Drontal Broad Spectrum Dewormer

This cat dewormer is a bit on the pricier side, but it does come with 50 tablets so you should have what you need with the purchase of one bottle. Because it contains a broad-spectrum chemical deworming profile (including praziquantel and pyrantel pamoate), you can use it for multiple species of worms. Plus the expiration date is 2 years, so you can hold on to it for a long time and use as necessary.

A few users have noted that their vets actually recommend this brand, although many have found that their cats don’t like the taste so it may be harder to get your feline to eat it.

Bayer Drontal Broad Spectrum Dewormer, 50 Tablets
  • Broad spectrum dewormer for Tapeworms, roundworms and hookworms
  • For cats and kittens over 1 month age and 1.5 pounds
  • Give one tablet per 4 8 pounds Body Weigh

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

  • Pros: 
    • Can be used to treat roundworms, tapeworms, and hookworms
    • Safe to use in kittens as young as 1 month old
  • Cons:
    • On the expensive side
    • Cats may be put off by the taste, making it difficult to administer

ProSense Liquid Dewormer Solutions for Cats

Does your kitty resist taking pills? This cat dewormer comes in a liquid form and is super easy to mix into food. You can also give it to your pet via an oral syringe or dropper, although some users note that giving the exact right dosage can be a little tricky this way…especially if your cat tries to spit it out of their mouths!

Many reviewers have also noted that you can expect to see results fast: certainly within the first 24 hours. Some owners even noticed their animals passing worms within just a few hours after receiving the medication!

The main chemical dewormer in it is piperazine, and used to treat roundworms exclusively. 

Pro-Sense Liquid Dewormer Solutions For Cats, 4-fl. oz.
  • Pro·Sense Roundworm Dewormer Solutions is an easy-to-administer liquid dewormer. Simply follow the...
  • For the Treatment and Control of Roundworms and provide ¼ tsp (included) per 2.5 lbs of Body Weight...
  • For a proactive approach to your cat’s overall wellness, add a Pro·Sense Ear Solutions Cleanser...
  • Dosage may be given directly or added to food, for multiple pet households, give directly to...

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

  • Pros: 
    • Easy to administer right into food or directly via a syringe
    • Cats seem to like or at least not notice the taste
  • Cons:
    • Doesn’t treat tapeworms (only roundworms)
    • Can’t give to cats less than 6 weeks old

Excel Liquid Roundworm Dewormer for Cats

This dewormer is another liquid option that’s noted to be safe and effective for the treatment of roundworms. It comes in a 4 fluid ounce bottle and contains the deworming agent piperazine. While it may not be appropriate for all cats, it does seem to work quickly for those who do respond to the medication. 

Users have put this liquid cat dewormer into food and water, so if your pet is a picky eater she may not notice the taste very much. It really depends on the individual cat though, as some pet parents have had trouble getting their animals to consume the medication. Results have been seen in as little as a few hours.

Excel Liquid Roundworm De-Wormer For Cats, 4-Ounce, Safe & Effective
  • Safe and effective against large roundworms
  • Great taste cats love
  • 4 fl oz bottle

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

  • Pros: 
    • The main ingredient is known for being safe and effective
    • Very affordable
    • Easy to dose
  • Cons:
    • Contains parabens (a preservative deemed by many to be potentially harmful to humans and animals)
    • Some users note that it didn’t work effectively
    • May not be strong enough for all cats

NaturPet D Wormer

This liquid dewormer is considered by many users to be the best over the counter cat dewormer. As a 100% natural solution, it reportedly can both kill intestinal parasites and soothe inflamed and irritated intestines. 

The 100 mL bottle contains enough for upwards of 7 deworming treatments, so depending on how much medication your pet needs (or how many cats you have requiring treatment), it may be a little on the expensive side.

That said, users have found this product to be well worth the price tag. It may help save money on vet bills since you can treat your pet at home with this medication—which is actually vet recommended in many cases.

There have been a few consumers who’ve reported that it didn’t seem to work effectively for their cat, and have seen live worms excreted in their stool after five weeks of treatment.

NaturPet D Wormer | 100% Natural, Safe, Effective Dewormer for Dogs and Cats | 3.3 oz Liquid Herbal...
  • Natural alternative to drugs and chemical dewormers
  • EASY TO ADMINISTER! – Simply place drops on your pet’s food or directly in mouth
  • Contains herbs traditionally used for pinworms, whipworms, tapeworms, & roundworms
  • Relaxes and soothes the lining of the digestive tract helping to ease gas

Last update on 2020-01-18 / Affiliate links / Images from Amazon Product Advertising API

  • Pros:
    • as an OTC cat dewormer, no prescription is required
    • Can be used to treat multiple types of worms
    • Safe for both dogs and cats
  • Cons:
    • Slightly more expensive
    • Can be difficult to administer
    • Many users note it has a strong foul odor


Worm infestations among cats are quite common, especially if they are outdoor felines or if they’ve been infested with fleas in the past. But even indoor cats may be at risk, as well as young kittens who can ingest worms via their infected mothers’ milk.

If harmful worms ever “worm” their way into your pet’s body, you’ll want to choose the best worm medicine for cats to remove the parasites. Why? Because aside from making your pet extremely uncomfortable and costing you thousands of dollars, a worm infestation can be fatal in felines!

Keep this list handy and be sure to share it with your fellow feline parents in case they ever have to deal with these pesky parasites, too.


What Dewormer do vets use for cats?

Many veterinarians prescribe Drontal, a broad-spectrum dewormer that kills hookworms, tapeworms, and roundworms and is safe to use in adult cats and kittens that are one month old and weigh at least 1.5 pounds.

How long does it take for Cat dewormer to work?

It takes 30-120 minutes to take affect and 24 hours to fully complete and be out of the cats system. The worms will come out when the cat goes to the bathroom, although may be in segments or already dissolved from the treatment.

Can you deworm a cat at home?

All kittens should be treated for common parasites such as roundworms and hookworms at 2, 4, and 6 weeks of age. This can be done at a veterinarian, or at home. To deworm a kitten at home, you'll need a digital scale, a 1cc syringe, and a bottle of oral dewormer which can be purchased online or at a pet supply store.

How often should you deworm a cat?

To protect your cat, common worms can be easily controlled with a routine worming treatment. Kittens need to be wormed every two weeks until twelve weeks of age, then monthly until six months of age. After six months all cats need to be wormed every three months for effective protection.

  • July 29, 2018
Mary Nielsen

A huge animal lover, born and raised around dogs, cats, chickens... Self-educated pet care nerd. Currently parent of three adopted cats and one small mutt. Animal adoption advocate. Loves a good book (about animals) and playing the piano.