Deworming has become an extremely common practice in veterinary medicine and is pivotal to the health and wellbeing of our pets. Gastrointestinal parasites can be prevalent amongst certain populations of cats including outdoor kitties, kittens from breeding colonies, those from shelters, and any cat not treated routinely with preventatives. Indoor cats are at risk too!
Deworming is often used to prevent disease before it is apparent. It can also be performed as a treatment after fecal testing is positive for parasites or worms are seen/suspected. The type of deworming agent used in your cat is guided either by fecal results, worms that are seen in the stool, or your veterinarian’s preference.
In this article, we will discuss what to expect after deworming your cat, including common side effects, the recovery timeline, and important steps to take at home.
Common side effects of deworming treatments in cats
While significant side effects are uncommon, these are the ones cats may experience within 24 hours of treatment:
- Vomiting
- Diarrhea
- Loss of appetite
- Drooling
- Irritation at the site of administration – if topical medication is used. This can include redness of the skin, and fur loss.
- Worms present in vomit or stools. The worms would usually be dead.
- Lethargy
- Irritability
Rare side effects include:
- Tremors
- Seizures
- Gastrointestinal obstructions from dead worms
After deworming, side effects are typically self-limiting and usually resolve within 24 hours. Diarrhea, drooling, and poor appetite are the most common side effects reported by owners. These side effects may persist for a day or two but usually do not require medical treatment.
Oral deworming products are more likely to cause gastrointestinal upset such as vomiting, diarrhea, or poor appetite. These side effects may be avoided if you give the deworming medication after a meal. If tummy upset occurs, make sure your cat stays well hydrated and continues to eat. You can feed small frequent meals of a wet diet, or even a bland diet like boiled chicken and rice.
Topical deworming products may lead to hypersalivation, irritability, and skin irritation. Some cats can have reactions to topical skin products and lose hair or develop an allergic reaction. If a severe reaction is seen secondary to topical medication, consider bathing your cat in Dawn dish soap right away and have them seen by a veterinarian immediately.
When to contact your vet: If your pet is lethargic, vomits more than twice, has ongoing liquid diarrhea, blood in the stools, or has stopped eating, please contact a veterinarian right away. Any severe side effects like tremors or seizures need to be addressed immediately.
Is deworming 100% effective? Will my cat still have worms after the treatment?
A few key points to know:
No treatment for parasites is 100% effective. Proper administration is a must to increase the likelihood of success.
Repeated fecal testing is important. This helps ensure no ongoing presence of parasites or worms in your cats. Some parasites may resist treatment, and certain deworming treatments only target adult parasites, requiring additional treatments to break the worm lifecycle. To determine if worms are still a problem, consider repeated fecal testing to assure your pet is no longer positive for parasites. You can also go by clinical signs and consider repeated deworming if your pet is losing weight, has a pot belly, or parasites are seen in the feces.
Cats may shed dead worms for a few days to a week following treatment. Seeing dead or dying worms in the feces after treatment is extremely normal! It may be alarming to owners to see a large number of worms in the feces , but this means that the treatment is working. The lack of worms in the feces does not mean that treatment isn’t working. The parasites may be too tiny to see with the naked eye. Learn how long it takes to get rid of worms (after deworming).
Worms often begin to die within hours of administration of deworming medications. Each dewormer works differently to eliminate worms, so some work quicker than others. Some dewormers only target adult parasites and not larvae, so repeated deworming is necessary. Kittens require repeated deworming every 2-3 weeks until they are 12 weeks old.
Repeated treatment and timeline are determined by the type of parasite and dewormer administered. Check with your vet. In kittens, dewormer is often repeated every 2-3 weeks. The same is true for treatments that target adult parasites and not the larva. Certain topical and oral treatments are repeated monthly. Your veterinarian will help you formulate a treatment schedule that is best for your kitty. Here are general guidelines:
- Kittens: Deworming every 2 weeks from 2 weeks until 2-3 months of age is recommended. After 2-3 months of age, broad-spectrum deworming agents should be used regularly. Deworming should continue monthly until at least 6 months of age.
- Outdoor adult cats, shelter cats, or breeding cats: Deworming is recommended every 3 months or as guided by fecal testing results.
- Indoor cats: Deworming may be recommended on an as-needed basis as determined by clinical signs or positive fecal testing. Fecal tests are recommended every 6 months to a year. Monthly prevention is still strongly encouraged. One vet we spoke to, Dr Linda Simon, said ‘I wish owners of indoor cats knew how often we diagnosed worms in these guys. Just last week I diagnosed tapeworm in two kitties who had never been outside’.
Clean your house if your cat has had worms to prevent reinfection and the spread of parasites
Sanitizing the home is very important after your pet has been diagnosed with worms. Some worms pass eggs and larvae in the feces that can cause reinfection of your cat. These parasites can be transmitted to other pets in the home. Some parasites are zoonotic, meaning they can be transmitted from animals to people. Therefore, proper cleaning and hand hygiene are so important. If your pet has been diagnosed with parasites, always wash your hands after touching them. Be extra mindful about cleaning the litter box.
Areas your cat frequents in the home must be disinfected. This will kill the worms and eggs that live in the home. Make a cleaning solution with diluted bleach and use this to clean solid surfaces that your pet comes in contact with. Use this solution to clean litter boxes or any area your pet has had an accident. Steam clean your furniture and wash all bedding your cat has been in contact with.
It is important to continue this regimen during the course of deworming treatment in your pet. You do not want to risk them becoming reinfected. Learn more about cleaning your house after deworming your cat here
FAQ
Can you deworm a pregnant cat?
Yes! It is very important to prevent and treat parasites in pregnant and nursing animals. Some parasites are easily passed from mom to kitten, so prevention is key. Discuss products that are safe to use in pregnant or lactating cats as some are not safe for the kittens. Panacur (Fenbendazole) is one example of a product that is usually safe for pregnant and lactating mums.
Should I feed my cat after deworming?
Ideally, you should feed your cat before deworming to try to eliminate the side effects of an upset stomach. If this is not an option, consider feeding your cat small frequent meals after deworming. If vomiting occurs, let your cat’s stomach settle for 4-6 hours before offering a meal. Consider feeding a bland diet like boiled chicken and rice for a few days to help support good digestion.
Can I bathe my cat after deworming?
When using oral medications, bathing is very safe and sometimes recommended to prevent reinfection from parasites passing in the stool. With topical medications, bathing is not recommended for at least 24-72 hours. Bathing prior to this time frame may wash away the active ingredients of the deworming medication and decrease efficacy. Chat with your veterinarian to determine how long you should wait.
Can indoor cats even get worms?
Even though outdoor kitties are at high risk, indoor pets can get worms too! This is most often caused by the transmission of tapeworms by fleas. Cats can also pick up parasites brought in by other animals or even through our natural movement in and out of the home. Therefore, monthly preventatives are so important.
Learn more about indoor cats getting worms here.
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