Itrafungol for Cats is a prescription-only oral antifungal medicine used by veterinary surgeons to treat feline ringworm, also called dermatophytosis. Despite the name, ringworm is not caused by a worm; it is a fungal infection that affects the superficial skin layers and the hair shafts.
VETERINARY PRESCRIPTION REQUIRED
Itrafungol contains itraconazole (10 mg/ml), a triazole antifungal that targets dermatophyte fungi, and it is specifically authorised for cats. Because fungal spores can be shed from the coat even when lesions look small, Itrafungol is often one part of a wider approach that may also include topical therapy and careful environmental cleaning. Used as directed by your vet, Itrafungol helps reduce fungal load in the coat, supports healing of skin lesions, and limits further spread, which is especially important in multi-cat homes or when vulnerable family members are present.
Ringworm in cats is most commonly caused...
Itrafungol for Cats is a prescription-only oral antifungal medicine used by veterinary surgeons to treat feline ringworm, also called dermatophytosis. Despite the name, ringworm is not caused by a worm; it is a fungal infection that affects the superficial skin layers and the hair shafts.
VETERINARY PRESCRIPTION REQUIRED
Itrafungol contains itraconazole (10 mg/ml), a triazole antifungal that targets dermatophyte fungi, and it is specifically authorised for cats. Because fungal spores can be shed from the coat even when lesions look small, Itrafungol is often one part of a wider approach that may also include topical therapy and careful environmental cleaning. Used as directed by your vet, Itrafungol helps reduce fungal load in the coat, supports healing of skin lesions, and limits further spread, which is especially important in multi-cat homes or when vulnerable family members are present.
Ringworm in cats is most commonly caused by a dermatophyte called Microsporum canis. Dermatophytes have the ability to use keratin as a nutrient source, which is why the infection tends to involve hair, claws, and the outer layer of the skin. Infected hairs carry microscopic spores that can be shed into the home and remain infective in dust and on fabrics unless the environment is cleaned thoroughly. Cats can catch ringworm through direct contact with an affected animal, by sharing bedding, grooming tools, carriers, or scratching posts, or by coming into contact with contaminated shed hairs. Kittens, long-haired cats, seniors, and cats with reduced immune function are more at risk, and it is common for apparently healthy cats to carry spores without obvious lesions. Ringworm is zoonotic, meaning it can infect humans, so prompt treatment and sensible hygiene can help protect everyone in the household without causing panic or unnecessary isolation.
Ringworm does not always look the same from one cat to another. Some cats develop classic circular patches of alopecia, whilst others show only mild coat thinning or dandruff-like scaling, particularly on the face, ears, paws, or tail. Pruritus (itching) can be absent or mild, and secondary bacterial folliculitis can change the appearance of lesions. If you are wondering whether your cat’s skin changes could be ringworm, these are common signs your vet may ask about:
Diagnosis is best confirmed with veterinary tests such as microscopic examination of plucked hairs, fungal culture, or PCR testing, and your vet may also use a Wood’s lamp to look for fluorescence. Accurate diagnosis matters, because allergic dermatitis, mites, and bacterial skin infections can mimic ringworm and require different treatment.
Itrafungol works by delivering itraconazole into the bloodstream, where it concentrates in keratin-rich tissues such as the skin and hair follicles. Itraconazole interferes with fungal cell membrane production by inhibiting enzymes involved in ergosterol synthesis, including lanosterol 14‑alpha‑demethylase. Without adequate ergosterol, the fungal cell membrane becomes unstable and the organism cannot grow and reproduce normally, which helps reduce spore shedding and allows the skin to recover. This is why Itrafungol is usually used as part of a planned treatment programme rather than as a single one-off dose. The medicine has a useful tendency to persist in the skin and hair for a period after dosing, which supports the common ‘pulse’ approach to treatment. In ringworm, clearing the infection is not only about improving how the skin looks; it is also about reducing infectivity, which is important for other pets and for the wider home environment.
Itrafungol is supplied as an oral solution, with a graduated dosing syringe designed to support accurate measurement. The labelled regimen for Itrafungol in cats is 0.5ml per kg of bodyweight once daily for seven consecutive days, followed by seven days with no treatment, repeated for three treatment weeks in total. Your vet may tailor this plan depending on your cat’s clinical response, coat length, and household risk, so follow the prescription instructions even if the lesions seem to improve quickly. Give Itrafungol slowly into the side of the mouth, allowing your cat to swallow, and try to dose at roughly the same time each day on dosing weeks. If your cat spits out a dose or vomits shortly after dosing, ask your vet for advice rather than repeating the dose immediately. Many vets recommend combining Itrafungol with topical measures, because washing can remove spores from the coat and reduce environmental contamination, and follow-up testing may be advised before your cat is considered clear.
Most cats tolerate Itrafungol well, but, like all medicines, it can cause side effects. The most commonly reported effects include hypersalivation during dosing, reduced appetite, vomiting, or loose stools, and these often settle as the cat adjusts or during the non-treatment weeks. Less commonly, itraconazole can affect the liver, so your vet may recommend monitoring, particularly if treatment is prolonged, your cat is older, or there is pre-existing hepatic disease. Tell your vet about any other medicines or supplements your cat is taking, because itraconazole can interact with certain drugs. Alongside Itrafungol, good home hygiene supports recovery: vacuum frequently, wash bedding on a hot cycle where safe to do so, and disinfect hard surfaces, carriers, and grooming tools according to veterinary advice. Wearing gloves when handling affected areas and washing hands afterwards can lower the chance of human infection, and if anyone in the household develops a suspicious rash, it is sensible to seek medical advice while your cat continues the prescribed Itrafungol course.
How does Itrafungol work against ringworm?
Itrafungol contains itraconazole, a triazole antifungal. It reduces fungal growth by disrupting ergosterol production, which is needed for a healthy fungal cell membrane. Because itraconazole concentrates in keratin-rich tissues like hair and skin, Itrafungol helps reduce spore shedding and supports lesion healing.
How long does Itrafungol take to clear ringworm in cats?
Some skin improvement can be seen within weeks, but full clearance depends on hair regrowth and test results. Many cats need a pulse-style course over several weeks, plus cleaning to remove spores. Your vet may recommend repeat fungal culture or PCR before declaring your cat clear, even if the skin looks better.
What are the common side effects of Itrafungol in cats?
The most common effects are mild gastrointestinal signs such as hypersalivation at dosing, reduced appetite, vomiting, or loose stools. These can be more noticeable at the start of dosing weeks. Less commonly, itraconazole can affect the liver, so tell your vet if your cat becomes lethargic, stops eating, or seems unwell.
Can ringworm spread to humans while my cat is on Itrafungol?
Yes, ringworm is zoonotic, and people can become infected through contact with spores on fur, bedding, or dust. Itrafungol helps reduce infectivity, but hygiene still matters. Wash hands after handling your cat, avoid face contact, and use gloves for grooming or applying topical products. Seek medical advice for suspicious skin lesions.
