Roundworms are one of the most common intestinal parasites in cats. These worms can cause serious health problems if left untreated. As a responsible pet owner, it’s important to understand how roundworms affect cats, what medications are available, and how to prevent future infections.
Cats can get roundworms in different ways—through their mother’s milk, by eating infected prey, or even from contaminated soil. Kittens are especially vulnerable, but adult cats can also become infected. The good news is that roundworm infections are treatable with the right medication.
In this guide, we’ll cover everything you need to know about roundworm medication for cats. We’ll discuss how these parasites spread, the symptoms to watch for, and the best treatment options. You’ll also learn about prevention methods to keep your cat healthy.
What Are Roundworms in Cats?
Types of Roundworms Affecting Cats
Two main types of roundworms infect cats:
Toxocara cati – The most common roundworm in cats. Kittens often get it from their mother’s milk.
Toxascaris leonina – Less common but can infect both cats and dogs.
These worms live in the intestines and feed on nutrients from the cat’s food. Over time, they can cause malnutrition and other health issues.
How Do Cats Get Roundworms?
Cats can pick up roundworms in several ways:
From their mother – Kittens can get infected through their mother’s milk.
Eating infected prey – Mice, birds, and other small animals can carry roundworm larvae.
Ingesting eggs from the environment – Roundworm eggs can survive in soil for months. If a cat walks on contaminated ground and then licks its paws, it can swallow the eggs.
Symptoms of Roundworm Infection in Cats
Not all infected cats show symptoms right away. However, common signs include:
Vomiting – Sometimes, live worms may be seen in vomit.
Diarrhea – The stool may contain worms or look unusually soft.
Pot-bellied appearance – Especially common in kittens.
Weight loss – Despite eating normally, the cat may lose weight.
Dull coat – Poor nutrient absorption can make the fur look rough.
Lethargy – Infected cats may seem less active than usual.
If you notice any of these symptoms, take your cat to the vet for a check-up.
Diagnosing Roundworms in Cats
Vets diagnose roundworms by examining a stool sample under a microscope. The eggs are usually easy to spot. In some cases, adult worms may be seen in vomit or feces.
If your cat shows symptoms but the stool test is negative, the vet may recommend additional tests. Early detection helps in effective treatment.
Best Roundworm Medications for Cats
Several safe and effective medications can treat roundworms in cats. Some are available over-the-counter (OTC), while others require a prescription.
1. Dewormers (Anthelmintics) for Roundworms
These medications kill adult worms in the intestines. Common options include:
Pyrantel Pamoate
- Works by paralyzing the worms, which are then passed in the stool.
- Safe for kittens and pregnant cats.
- Found in products like Nemex and Strongid.
Fenbendazole (Panacur)
- Effective against roundworms and other parasites like hookworms.
- Given for several days to ensure all worms are eliminated.
Milbemycin Oxime (Interceptor, Milpro)
- Treats roundworms, hookworms, and prevents heartworm.
- Often used in monthly preventatives.
Selamectin (Revolution Plus)
- A topical treatment that also kills fleas, ticks, and ear mites.
- Requires a prescription.
2. Prescription vs. Over-the-Counter Medications
- Prescription medications (like Drontal, Profender) are stronger and may treat multiple parasites at once.
- OTC dewormers (like Bayer Tapeworm Dewormer) can be effective but may not cover all worm types.
Always consult your vet before giving any medication to ensure the correct dosage and safety.
3. Natural Remedies – Do They Work?
Some pet owners try natural remedies like:
- Pumpkin seeds (believed to help expel worms)
- Diatomaceous earth (food-grade, mixed into food)
- Herbal dewormers (containing wormwood or cloves)
While these may help in mild cases, they are not as reliable as veterinary-approved medications. Severe infections require proper treatment.
How to Administer Roundworm Medication to Cats
Giving medication to cats can be tricky. Here are some tips:
1. Oral Medications (Tablets or Liquids)
- Hide the pill in a treat or use a pill pocket.
- If using liquid, gently squirt it into the side of the cat’s mouth.
- Follow dosage instructions carefully.
2. Topical Treatments (Spot-On Solutions)
- Apply between the shoulder blades where the cat can’t lick it off.
- Avoid bathing the cat for 48 hours after application.
3. Injectable Dewormers (Vet-Administered)
- Some clinics offer injections for severe cases.
- Usually fast-acting and effective.
Side Effects of Roundworm Medication
Most cats tolerate dewormers well, but some may experience:
- Mild vomiting or diarrhea
- Lethargy for a day
- Loss of appetite
If side effects last more than 24 hours, contact your vet.
Preventing Roundworm Infections in Cats
Prevention is key to keeping your cat worm-free. Here’s how:
1. Regular Deworming
- Kittens should be dewormed every 2 weeks until 3 months old, then monthly until 6 months.
- Adult cats should be treated every 3-6 months, depending on their lifestyle.
2. Flea Control
Fleas can carry tapeworm eggs, so keeping fleas away helps prevent worms.
3. Clean Litter Boxes
Scoop daily and disinfect regularly to prevent egg contamination.
4. Keep Cats Indoors
Outdoor cats are more likely to hunt and eat infected prey.
5. Regular Vet Check-ups
Annual fecal tests help detect worms early.
Can Humans Get Roundworms from Cats?
Yes, humans (especially children) can accidentally ingest roundworm eggs from contaminated soil or cat fur. This can lead to visceral larva migrans, where larvae migrate through the body, causing inflammation.
To reduce risk:
- Wash hands after handling cats or cleaning litter boxes.
- Keep sandboxes covered to prevent cats from using them as litter.
- Teach children not to put dirty hands in their mouths.
Frequently Asked Questions
1. How quickly does roundworm medication work?
Most medications start working within 24 hours, with worms passing in the stool within a few days.
2. Can I deworm my cat at home?
Yes, with OTC medications, but a vet’s guidance ensures proper treatment.
3. Will my cat vomit worms after treatment?
Sometimes, especially with heavy infestations. This is normal as the worms die and are expelled.
4. How often should I deworm my cat?
Kittens: Every 2 weeks until 3 months, then monthly. Adults: Every 3-6 months.
5. Can roundworms come back after treatment?
Yes, if the cat is re-exposed. Regular prevention is important.
Conclusion
Roundworms are a common but treatable problem in cats. With the right medication—such as pyrantel pamoate, fenbendazole, or selamectin—you can effectively eliminate these parasites. Always follow your vet’s advice for the best treatment plan.
Prevention is just as important as treatment. Regular deworming, flea control, and good hygiene practices will help keep your cat healthy. If you suspect your cat has roundworms, don’t wait—early treatment prevents complications.
By staying informed and proactive, you can protect your feline friend from roundworms and ensure a long, happy life together. If you have any concerns, always consult your veterinarian for personalized advice.
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