Stomach & digestion Dogs & Cats

Mirtazapine (Mirataz) for dogs and cats

Stimulates appetite and manages weight loss, mainly in cats. It also reduces nausea. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerMirtazapine is a prescription medicine for dogs and cats. It acts on serotonin and histamine receptors to boost appetite. Mirataz is an ointment rubbed on the inside of a cat's ear. The most common side effects: vocalizing, agitation, vomiting, wobbliness and restlessness, which can mean the dose is too high.

Key facts

Generic nameMirtazapine
Common brand namesMirataz, Remeron
Used inDogs & Cats
TypeStomach & digestion
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Stimulates appetite and manages weight loss, mainly in cats. It also reduces nausea. [1]

How it works

It acts on serotonin and histamine receptors to boost appetite. Mirataz is an ointment rubbed on the inside of a cat's ear. [1]

Side effects and cautions

Common side effects: Vocalizing, agitation, vomiting, wobbliness and restlessness, which can mean the dose is too high. [1]

Use with care: Not with MAOIs. Use caution in pets with liver or kidney disease. [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.

Mirtazapine FAQ

What is Mirtazapine used for in dogs and cats?

Stimulates appetite and manages weight loss, mainly in cats. It also reduces nausea.

What are the side effects of Mirtazapine?

Vocalizing, agitation, vomiting, wobbliness and restlessness, which can mean the dose is too high.

Does Mirtazapine need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Mirtazapine 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 – Mirtazapine (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs