Other Dogs & Cats

Theophylline for dogs and cats

Treats coughing from narrowed airways. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerTheophylline is a prescription medicine for dogs and cats. A bronchodilator that relaxes the muscles around the airways. The most common side effects: excitement, nausea, vomiting, diarrhea and sleeplessness.

Key facts

Generic nameTheophylline
Common brand namesTheo-24
Used inDogs & Cats
TypeOther
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Treats coughing from narrowed airways. [1]

How it works

A bronchodilator that relaxes the muscles around the airways. [1]

Side effects and cautions

Common side effects: Excitement, nausea, vomiting, diarrhea and sleeplessness. [1]

Use with care: 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.

Theophylline FAQ

What is Theophylline used for in dogs and cats?

Treats coughing from narrowed airways.

What are the side effects of Theophylline?

Excitement, nausea, vomiting, diarrhea and sleeplessness.

Does Theophylline need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Theophylline 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.

Related medications

Related cost guides

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 – Theophylline (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs