Cat Deworming

Caveat on cat deworming: Deworming agents are poisonous drugs that are designed to kill parasites and not hurt the cat but the cat needs to be well enough to cope with the treatment particularly if a kitten is infested. Kittens should be otherwise well and de-stressed. Kittens are commonly infested with ascarids but just treating that type of worm may be unwise as there may be other types present. A vet check is advised. Certain drugs treat certain worms.

Here’s a comprehensive list of treatments. It might be useful to first touch on some clinical signs of internal parasites. A visit to the vet is always recommended.

Signs of worms, internal parasites

Roundworm: usually restricted to cats and kittens living in an environment that is contaminated with ascarid eggs. Infestation in kittens can be a serious health problem. An infested kitten will have a pot-bellied appearance, rough coat and poor muscle development. There may be vomiting and diarrhea that may contain worms.

Hookworms: Blood loss through damage to intestine wall causing feline anemia. This leads to weakness, depression, lethargy. Chronic, dark, tary diarrhea that may contain blood and mucous. Vomiting. Diagnosis: worms in vomit and feces.

Tapeworms: Dull coat, decreased appetite, weight loss. Most cases show no signs. Diagnosis: eggs in feces and around tail and anal region.

Heartworms: persistent cough, dyspnea (shortness of breath), depression, weight loss and “sporadic vomiting”.

Lungworms: most cats show no signs (asymptomatic). Non-productive cough can be present.

Liver Flukes: Liver fluke induced liver disease signs are: vomiting, diarrhea, anorexia, icterus (jaundice).

See more: Cat Parasites

Cat Deworming Treatments

Always read the instructions and check with your vet. Some medications are not suitable for kittens. For example Piperazine (Worm Away, Wormicide – available in USA) is not recommended for kittens by one site.

MedicationWormWhereComment
Drontal“kills every type of intestinal worm commonly found in UK cats”UKDrontal available at Amazon (£1.58)
MilbemaxRoundworm Tapeworm HookwormUKCan only be prescribed by your vet
Bob Martins Cat Spot On Dewormer“effective against the most common worms”UKWorks by dropping liquid on skin
Total care Worming PasteUnclear, probably general purposeUKMin age >6 weeks
Sherley’s Multi Cat Wormer TabletsRoundworm TapewormUKCats over 6 months old
Worm AwayRoundworm Hookworm (partial)USAMin age >6 weeks
WormicideRoundworm Hookworm (partial)USAMin age >6 weeks
NemexRoundworm Hookworm Tapeworm (some)USAMin age >2 weeks
ProWormer-2Roundworm Hookworm Tapeworm (some)USAMin age >2 weeks
PanacurRoundworm Hookworm Taenia sp of tapewormUSA, UKNo age limit
DroncitTapeworm Liver flukesUSA, UKMin age >6 weeks
Feline CestocideTapeworm Liver flukesUSAMin age >6 weeks
CestexTapewormUSAMin age >7 weeks
Triple WormerRoundworm Hookworm Some species of tapewormUSAMin weight >2.5 pounds
Happy JackRoundworm Hookworm Some species of tapewormUSAMin weight >2.5 pounds
HeartgardHeartworm Hookworm (partial)USAMin age >6 weeks


From Cat Deworming to Cat Health Problems

Primary source material for Cat Deworming: The Cat, Its Behavior, Nutrition & Health by Linda P Case.

Cat Deworming – Original photo on Flickr

Please comment here using either Facebook or WordPress (when available).
Michael Broad

Hi, I'm a 71-year-old retired solicitor (attorney in the US). Before qualifying I worked in a many jobs including professional photography. I have a girlfriend, Michelle. I love nature, cats and all animals. I am concerned about their welfare.

Leave a Comment

Recent Posts

Can pumpkin help cats with diarrhea?

Pumpkin contains soluble fibre which absorbs excess water and therefore it firms up a cat's stool. Adding a teaspoon of…

3 hours ago

The meaning of “lines” in cat breeding

The goal of cat breeders should be to found (establish) a line of healthy cats which excel in reference to…

8 hours ago

How do I know my cat is happy?

The signs that your cat is happy will be subtle. It is easier to ask yourself whether you are happy…

12 hours ago

Unwillingness to eat: a classic sign that a cat is dying of old age

People search for signs that their cat is dying of old age. I have just read about a 31-year-old Maine…

13 hours ago

Can cat vaccinations cause diarrhoea?

Yes, cat vaccinations can cause diarrhoea. Sometimes cats have an allergic reaction to a vaccine. These are called type I…

23 hours ago

Is pet insurance worth the cost?

I don't think that pet insurance is worth the cost and I'll tell you why. There is a better alternative.…

1 day ago