Stomach & digestion Dogs & Cats

Famotidine (Pepcid) for dogs and cats

Lowers stomach acid for ulcers, stomach inflammation and acid reflux. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerFamotidine is a over the counter medicine for dogs and cats. An H2 blocker: it cuts acid production in the stomach. The most common side effects: vomiting, diarrhea or low appetite; dry mouth.

Key facts

Generic nameFamotidine
Common brand namesPepcid
Used inDogs & Cats
TypeStomach & digestion
Prescription?Over the counter (ask your vet first)
Typical US priceNot listed (no reliable public source)

What it's used for

Lowers stomach acid for ulcers, stomach inflammation and acid reflux. [1]

How it works

An H2 blocker: it cuts acid production in the stomach. [1]

Side effects and cautions

Common side effects: Vomiting, diarrhea or low appetite; dry mouth. [1]

Use with care: Ask your vet first: some products contain extra ingredients. Use caution in older pets and pets with liver, kidney or heart 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.

Famotidine FAQ

What is Famotidine used for in dogs and cats?

Lowers stomach acid for ulcers, stomach inflammation and acid reflux.

What are the side effects of Famotidine?

Vomiting, diarrhea or low appetite; dry mouth.

Does Famotidine need a prescription?

Many forms are sold without a prescription. Still, check with your vet first. Pet doses and safe products are not the same as for people.

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