Is Allopurinol (Zyloprim) Safe for Dogs?
Why it’s conditional
Veterinarians prescribe allopurinol for certain dogs with urate bladder stones or leishmaniasis, so the drug itself is not foreign to canine medicine. The risk is unsupervised dosing: tablets made for people are sized for human bodies, and an accidental dose can cause vomiting, diarrhea, and, in large ingestions, kidney stress. Dogs with liver or kidney disease are more vulnerable.
How to keep your pet safe
Keep the bottle closed and stored above counter height, and never share your own prescription with a pet. If your vet has prescribed allopurinol for your dog, follow the label exactly and ask before changing anything. Bladder stone management should be vet-directed, not handled with borrowed human pills.
Warning signs to watch for
Vomiting, diarrhea, drooling, loss of appetite, lethargy; with large ingestions, increased thirst or reduced urine output.
When to call the vet
If your dog eats an allopurinol tablet not prescribed for it, call your vet or a pet poison hotline with the tablet strength and your dog’s weight. Most single-tablet exposures are managed with monitoring, but a professional should make that call.
Common questions
Can I give my dog my gout medicine?
Not on your own. Allopurinol is used in dogs for specific conditions, but the dose and monitoring must come from a vet. Human tablets are not interchangeable with veterinary dosing.
What if my dog ate one 100 mg allopurinol tablet?
A single tablet often causes no more than an upset stomach, but effects depend on size and health. Call your vet or a pet poison hotline with the details rather than assuming it is fine.
More medications hazards for dogs
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).