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

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Michael Broad

Hi, I am 70-years-of-age at 2019. For 14 years before I retired at 57, I worked as a solicitor in general law specialising in family law. Before that I worked in a number of different jobs including professional photography. I have a longstanding girlfriend, Michelle. We like to walk in Richmond Park which is near my home because I love nature and the landscape (as well as cats and all animals).

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