Antifungals Dogs & Cats

Itraconazole for dogs and cats

Treats ringworm and deeper fungal infections such as blastomycosis. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerItraconazole is a prescription medicine for dogs and cats. It blocks fungi from building their cell membranes. The most common side effects: low appetite, vomiting, weight loss and liver problems.

Key facts

Generic nameItraconazole
Common brand namesItrafungol, Sporanox
Used inDogs & Cats
TypeAntifungals
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Treats ringworm and deeper fungal infections such as blastomycosis. [1]

How it works

It blocks fungi from building their cell membranes. [1]

Side effects and cautions

Common side effects: Low appetite, vomiting, weight loss and liver problems. Dogs can get ulcerating skin sores at higher doses. [1]

Use with care: Use extra caution with liver disease. Tell your vet about every other medicine your pet takes. [1]

Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.

About dosingDosing is your vet's call. We don't list doses because the right amount depends on your pet's weight, age, health and other medicines. Don't change a dose or stop a medicine without asking your vet, and never give a pet medicine meant for people unless your vet tells you to [2].

What it costs

We don't list a price for this one because we couldn't find a reliable public source. Ask your vet or pharmacy for a quote; prices depend on your pet's size, the dose and where you fill it.

Itraconazole FAQ

What is Itraconazole used for in dogs and cats?

Treats ringworm and deeper fungal infections such as blastomycosis.

What are the side effects of Itraconazole?

Low appetite, vomiting, weight loss and liver problems. Dogs can get ulcerating skin sores at higher doses.

Does Itraconazole need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Itraconazole should I give my pet?

Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.

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This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.

Sources (2) — tap to show
  1. VCA Animal Hospitals – Itraconazole (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs