Antibiotics Dogs & Cats

Amoxicillin for dogs and cats

Treats certain bacterial infections, most often skin, respiratory and urinary infections. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerAmoxicillin is a prescription medicine for dogs and cats. A penicillin-type antibiotic that breaks down bacterial cell walls. The most common side effects: low appetite, vomiting and diarrhea.

Key facts

Generic nameAmoxicillin
Common brand namesAmoxi-Tabs, Amoxi-Drop
Used inDogs & Cats
TypeAntibiotics
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Treats certain bacterial infections, most often skin, respiratory and urinary infections. [1]

How it works

A penicillin-type antibiotic that breaks down bacterial cell walls. [1]

Side effects and cautions

Common side effects: Low appetite, vomiting and diarrhea. [1]

Use with care: Not for pets allergic to penicillins. Never give it to rabbits, guinea pigs, hamsters or other small mammals. [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.

Amoxicillin FAQ

What is Amoxicillin used for in dogs and cats?

Treats certain bacterial infections, most often skin, respiratory and urinary infections.

What are the side effects of Amoxicillin?

Low appetite, vomiting and diarrhea.

Does Amoxicillin need a prescription?

Yes. It needs a prescription from a veterinarian.

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