Eye & skin Dogs & Cats

Dorzolamide for dogs and cats

Lowers pressure inside the eye in glaucoma. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerDorzolamide (dorzolamide (eye drops)) is a prescription medicine for dogs and cats. It reduces the amount of fluid made inside the eye. The most common side effects: stinging, red or watery eyes, and nausea.

Key facts

Generic nameDorzolamide (eye drops)
Common brand namesTrusopt, Cosopt
Used inDogs & Cats
TypeEye & skin
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Lowers pressure inside the eye in glaucoma. [1]

How it works

It reduces the amount of fluid made inside the eye. [1]

Side effects and cautions

Common side effects: Stinging, red or watery eyes, and nausea. [1]

Use with care: Not for pets allergic to sulfa drugs. Glaucoma can blind quickly, so keep rechecks. [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.

Dorzolamide FAQ

What is Dorzolamide used for in dogs and cats?

Lowers pressure inside the eye in glaucoma.

What are the side effects of Dorzolamide?

Stinging, red or watery eyes, and nausea.

Does Dorzolamide need a prescription?

Yes. It needs a prescription from a veterinarian.

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