Deworming your kitten is one of the most important preventive steps in the first months of life: approximately 80% of kittens are born already carrying intestinal parasites transmitted by their mother, making a timely antiparasitic protocol essential. Starting this process correctly protects not only your little cat's health, but also your family's, since some worms can be transmitted to humans.
Why deworming your kitten is essential
Intestinal parasites pose a serious threat to kittens, interfering with nutrient absorption during a crucial stage of development. Roundworms (Toxocara cati) are the most common parasite, found in 70โ90% of untreated kittens. These cylindrical nematodes, 5โ10 cm in length, feed on intestinal contents and prevent healthy growth.
The consequences of an untreated infestation include:
- Growth delay and insufficient body weight (up to 30% below average)
- Swollen abdomen that is painful to the touch
- Persistent diarrhoea with possible dehydration
- Vomiting containing visible worms
- Dull, dry coat lacking any shine
- Anaemia in severe cases (haematocrit below 25%)
The zoonotic risk should not be underestimated: visceral larva migrans can affect children who play in environments contaminated by infected faeces, causing liver, lung and eye problems. For this reason, WSAVA guidelines recommend strict deworming protocols from the very first weeks of life.
The life cycle of intestinal parasites
Understanding how worms reproduce helps explain why acting promptly is so important. Adult roundworms in the intestine produce up to 200,000 eggs per day, which are shed in the faeces. In the external environment, these eggs become infective within 2โ4 weeks and can survive for months. Kittens become infested through transplacental transmission, through their mother's milk, or by ingesting eggs from the environment.
Vertical mother-to-kitten transmission
Even apparently healthy cats can harbour dormant larvae in their muscle tissue. During pregnancy and nursing, these larvae reactivate and migrate to the uterus and mammary glands, infesting the kittens even before birth. This is why the first deworming of a kitten must begin so early.
When to start deworming your kitten
The antiparasitic schedule follows precise steps based on the biological cycle of the worms and the development of the feline immune system. The first deworming of a kitten is carried out at 3 weeks of age, once the weight exceeds 400 grams and the kitten begins to explore its surroundings.
Protocol for kittens from 3 weeks to 3 months
During this critical phase, treatment is given every two weeks:
- 3 weeks: first treatment with a product specifically formulated for kittens
- 5 weeks: second treatment (eliminates larvae that matured after the first)
- 7 weeks: third treatment
- 9 weeks: fourth treatment, often coinciding with the first vaccination
- 11 weeks: fifth treatment
This intensive schedule is based on the fact that deworming products only eliminate adult parasites present in the intestine at the time of treatment, not larvae migrating through the tissues. Repeating treatment every 15 days intercepts the new worms that mature in cycles.
Protocol from 3 to 6 months
After three months, when the immune system is more capable, the frequency drops to once a month until the sixth month of life. During this phase the kitten completes its vaccination course and is often neutered or spayed โ an ideal time to check parasite status with a faecal examination.
Protocol after 6 months
From 6 months onwards, deworming becomes quarterly (every 3 months) for cats with outdoor access or that hunt, or twice yearly for indoor cats with no contact with other animals. ESCCAP (European Scientific Counsel Companion Animal Parasites) guidelines still recommend at least 4 treatments per year for all adult cats.
Deworming products for kittens: which one to choose
The market offers a range of antiparasitic formulations, with active ingredients tailored to age and type of parasite. The choice must take into account the spectrum of activity, safety for kittens, and ease of administration.
Drontal Junior for kittens
Drontal Junior oral suspension is the gold standard for kittens from 3 weeks of age. It contains febantel and pyrantel pamoate, which are effective against roundworms (Toxocara cati, Toxascaris leonina) and hookworms (Ancylostoma tubaeforme). The dosage is 1 ml per kg of body weight, administered with a graduated syringe. Average cost: โฌ12โ15 per 50 ml bottle, sufficient for multiple treatments of a single kitten.
Advantages: palatable flavour, easy to dose for very low body weights, well tolerated even by debilitated kittens. Disadvantages: does not cover tapeworm; a separate treatment is required if tapeworm is present.
Milpro for young cats
Milpro chewable tablets (available for cats 0.5โ2 kg and 2โ8 kg) combine milbemycin oxime and praziquantel, offering a complete spectrum: roundworms, hookworms, tapeworm (Dipylidium caninum, Taenia spp.) and heartworm prevention. Suitable from 6 months or 500 grams of body weight. Cost: โฌ18โ22 per pack of 2 tablets.
Advantages: complete treatment in a single dose, includes cestodes. Disadvantages: tablets can be harder to administer to very small kittens; higher cost.
Other common products
- Profender spot-on: topical solution (emodepside + praziquantel) applied to the skin on the back of the neck; suitable from 8 weeks and 500 grams. Practical for cats that are difficult to medicate orally. Cost: โฌ15โ18 per single pipette
- Panacur (fenbendazole): broad-spectrum oral paste, particularly effective against Giardia. Treatment course of 3โ5 consecutive days. Cost: โฌ20โ25 per 18.75% syringe
- Stronghold Plus: monthly spot-on combining selamectin and sarolaner; also covers fleas and mites and prevents heartworm. Suitable from 8 weeks. Cost: โฌ16โ20 per pipette
What to avoid
Never use dog products on a cat: some molecules such as permethrin are lethal to felines. Avoid home remedies that have not been scientifically validated (garlic, pumpkin seeds) โ these have no proven efficacy and can be toxic. Always follow the stated dosages and minimum age recommendations: overdosing causes vomiting, excessive salivation and tremors.
Signs of worm infestation in kittens
Recognising the signs of parasitic infection allows for prompt action before the kitten's health is compromised. Some symptoms are obvious; others are more subtle.
Gastrointestinal signs
A swollen, taut belly (pot-bellied appearance) contrasting with an otherwise thin body is typical of heavy roundworm infestations. Diarrhoea may be intermittent or continuous, sometimes containing mucus or streaks of blood if blood-sucking hookworms are present. Occasional vomiting may contain whitish, cylindrical worms several centimetres long, resembling spaghetti.
Changes to the coat and growth
A dull, unkempt coat with dandruff and thinning patches indicates protein malabsorption. An infested kitten grows slowly: at 8 weeks it should weigh 800โ1,000 grams, but severe infestations can keep its weight below 600 grams. Lethargy and low energy levels accompany nutritional deficiency.
Respiratory and eye signs
During larval migration through the lungs (roundworm cycle), dry coughing, sneezing and laboured breathing may appear. Conjunctivitis with a watery eye discharge is associated with mixed infestations. Visible anaemia (pale gums, whitish inner ear surface) indicates hookworms feeding on intestinal blood, which can be potentially fatal in kittens under 500 grams.
Visible parasites
Tapeworm segments (resembling small, whitish, mobile rice grains) around the anus or in the faeces indicate Dipylidium caninum, transmitted by fleas ingested during grooming. Whole worms in the faeces or vomit confirm adult roundworms. The presence of fleas in the litter box always calls for tapeworm treatment.
How to administer dewormer to your kitten
Using the correct technique ensures the treatment is effective and minimises stress for the kitten.
Preparation and timing
Choose a calm moment, away from mealtimes (1โ2 hours before or after) to reduce the risk of vomiting. Weigh your kitten carefully using a digital scale: an error of 50 grams can significantly affect the dosage. Prepare everything you need before picking up the kitten: dosing syringe, product, soft towel, post-treatment treat.
Technique for oral suspensions
Gently wrap the kitten in a towel, leaving only its head free (the "burrito" technique), to limit sudden movements. With one hand, tilt the muzzle slightly upward; with the other, insert the syringe from the side, between the cheek and teeth, aiming towards the throat. Administer slowly, allowing the kitten to swallow โ never force the full dose at once (risk of inhalation). Gently massage the throat to encourage swallowing.
Technique for tablets
If the kitten is cooperative, hide the crushed tablet in a highly appetising wet food (tuna, boiled chicken). Otherwise, gently open the mouth by pressing the corners, place the tablet at the base of the tongue, close the mouth and massage the throat. Check that the kitten has swallowed by making sure it does not spit the tablet out after a few minutes.
After administration
Observe the kitten for 30โ60 minutes: immediate vomiting requires a repeat dose after 2โ3 hours. Diarrhoea within the following 24 hours is normal (expulsion of dead parasites). Offer plenty of fresh water. Note the treatment date on the calendar along with a reminder for the next one.
Costs and financial considerations
Planning a budget for deworming helps ensure continuity in preventive treatments.
First-year investment
A complete protocol for the first year includes:
- 5 fortnightly treatments (3โ11 weeks): โฌ25โ30
- 3 monthly treatments (3โ6 months): โฌ20โ25
- 2 quarterly treatments (6โ12 months): โฌ15โ20
- Faecal examination (recommended at 6 months): โฌ25โ35
Total for the first year: โฌ85โ110 โ a modest outlay considering it protects both your cat's health and your family's. Buying multi-pack or family-size formats reduces the unit cost by 15โ20%.
Annual costs for an adult cat
From 12 months onwards, 4 annual treatments cost โฌ40โ60 for indoor cats and โฌ60โ80 for outdoor cats, which require broader-spectrum products. Veterinary subscription plans or wellness plans often include deworming at reduced rates.
Savings on complications
Treating a severe infestation costs significantly more: intensive care for anaemia (blood transfusions โฌ200โ400), intravenous rehydration (โฌ80โ150), hospitalisation (โฌ50โ100 per day). Regular prevention avoids 95% of these emergencies according to AAFCO data.
Deworming and other preventive treatments
Integrating deworming into the overall health plan maximises your kitten's protection.
Coordination with vaccinations
Your cat's vaccinations begin at 8โ9 weeks, by which point the kitten will have already received 3โ4 deworming treatments. This timing is deliberate: intestinal parasites impair the immune response to vaccines, reducing their effectiveness by up to 40%. Deworming 7โ10 days before vaccination optimises seroconversion.
Integrated flea control
Flea and tick prevention is closely linked to deworming: fleas are carriers of the tapeworm Dipylidium. Monthly spot-on products that combine flea treatment and dewormer (Stronghold Plus, Broadline) simplify the protocol and ensure continuous coverage. Begin from 8 weeks using products that are safe for kittens.
Deworming before neutering or spaying
Before neutering or spaying (recommended at 5โ6 months), check that your kitten has been dewormed in the 2โ3 weeks beforehand. Intestinal parasites increase anaesthetic risk and slow post-surgical healing. Many vets include deworming as part of the neutering package.
Frequently asked questions
Can I deworm a 2-week-old kitten?
No โ most products are approved from 3 weeks of age and a minimum weight of 400 grams. Exceptions exist only in critical situations under close veterinary supervision. Younger kittens have immature livers and kidneys that cannot metabolise antiparasitic drugs properly, with a risk of toxicity. Wait until the kitten reaches the appropriate age and weight; in the meantime, keep the environment clean and disinfect litter trays daily using quaternary ammonium-based products.
Can a kitten be dewormed if it has diarrhoea?
It depends on the cause and severity. Mild diarrhoea without dehydration allows deworming to proceed โ the parasites themselves often cause the diarrhoea. However, if the kitten is debilitated, dehydrated (dry gums, inelastic skin) or has bloody diarrhoea, stabilise its condition first with fluid therapy and nutritional support. Deworming a severely compromised kitten can worsen its overall condition. Always consult your vet to determine the best timing when acute symptoms are present.
How soon after deworming are the worms expelled?
Dead parasites begin to be expelled in the faeces within 12โ24 hours of treatment, peaking at 48โ72 hours. You may see whole worms or segments in the faeces for 3โ5 days. This is normal and indicates the product is working. Transient diarrhoea accompanies expulsion in 30% of cases. If live, moving worms continue to appear after 7 days, contact your vet: a different product or adjusted dosage may be needed. Bear in mind that microscopic eggs continue to be shed for weeks, so rigorous litter tray hygiene is essential.
Can cat worms be transmitted to humans?
Yes, some feline parasites are zoonotic. Toxocara cati causes visceral larva migrans in humans, especially in children who put unwashed hands in their mouths after contact with contaminated soil. The larvae migrate to the liver, lungs and eyes, causing serious damage. Ancylostoma causes cutaneous larva migrans, with itchy, serpentine lesions on the skin. The tapeworm Dipylidium rarely infests humans (only if a person accidentally ingests an infected flea). Prevention: wash hands after handling the litter tray, remove faeces daily, deworm your cat regularly and keep fleas under control. The actual risk is low with good hygiene practices, but it is a sound reason to keep up with preventive treatments consistently.
Protecting your kitten starts with the basics
Deworming your kitten is not optional โ it is a cornerstone of feline preventive medicine, safeguarding your kitten's healthy development and the wellbeing of your entire household. Following the schedule carefully from the very first days of life, choosing products appropriate to your kitten's age, and coordinating with other preventive measures gives your little cat the best possible start. Remember that every kitten is an individual: always discuss the most suitable protocol with your vet, taking into account lifestyle, environment and the presence of other animals. To explore other aspects of kitten care, read our complete guide to cat vaccinations and find out how to manage parasite prevention effectively for a well-rounded approach to feline health.
