Allopurinol 300mg (100 Tabs) (Manufacture may vary)
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Allopurinol 300mg (100 Tabs) (Manufacture may vary)

Item# IWM046226
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This item has been manufacturer discontinued. We recommend trying Thyro-Tabs

Allopurinol is used to prevent urate bladder stones.

For: Dogs

  • Prevents recurrent urate bladder stones
  • Especially good for breeds prone to blood flow abnormalities

  • How it works: Allopurinol belongs to a class of drugs called xanthine oxidase inhibitors which prevent the accumulation of uric acid. If uric acid accumulates in the body, crystals form in the urine which may congregate to produce kidney or bladder stones.

    Prescription Required


    Dosage & Administration: Give this medication exactly as directed by your veterinarian. Allopurinol should be given with food to lessen stomach upset. Allopurinol should be given with lots of water. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. Store allopurinol at room temperature away from moisture and heat. Keep this medication away from children and pets.

  • Allopurinol is a prescription medication used in dogs for the prevention of urate bladder stones.
  • Allopurinol is not FDA approved for use in veterinary medicine; however, it is a commonly accepted practice for veterinarians to prescribe this medication for dogs.
  • Allopurinol should be used in adult dogs only. Do not use in puppies, kittens, or cats.

  • Tip: The medication should be given with meals. Water should be kept available for the pet. Allopurinol may cause drowsiness.
    Pet Weight Dosage
    Dogs: All weights Give 5mg per pound of pet’s body weight once a day with food
    Cats/Kittens: X X
    Horses: X X
    Storage: Should be stored at room temperature, away from moisture and heat.

    What happens if I miss giving a dose: Give the missed dose as soon as you remember during the same day. However, if you don¿t remember until the next day, skip the dose you missed and give only the next regularly scheduled dose. Do not give a double dose of the medication.

    What happens if I overdose the pet: Seek emergency veterinary medical treatment. Symptoms of allopurinol overdose are not known.

    What should I avoid while giving Allopurinol to my pet: Allopurinol may cause drowsiness.

    Possible side effects of Allopurinol: If any of the following serious side effects occur, stop giving allopurinol and seek emergency veterinary medical attention; an allergic reaction (difficulty breathing; swelling of the lips; tongue or face; hives), blood in the urine or pain when urinating, a rash, eye irritation, fever, chills or joint aches or severe nausea or vomiting. Other less serious side effects may occur. Continue giving allopurinol and talk to your veterinarian if your pet experiences upset stomach or diarrhea, dizziness or drowsiness or an acute attack of arthritis. Other side effects may also occur. Talk to your veterinarian about any side effect that seems unusual or bothersome to the animal.

    What other drugs will affect Allopurinol: Ampicillin or amoxicillin may increase the risk that a rash may develop. Tell your veterinarian if your pet is being given a thiazide diuretic, azathioprine, drugs used to treat cancer, cyclosporine, warfarin or theophylline. Drugs other than those listed may also interact with allopurinol. Talk to your veterinarian or pharmacist before giving any prescription or over the counter medicines.

    What should I discuss with my veterinarian before giving allopurinol to my pet: Tell your veterinarian if your pet has liver or kidney disease or if the pet is pregnant or lactating. Inform your veterinarian of any other medications, including vitamins and supplements your pet may be taking while receiving Allopurinol.

    Cautions: Allopurinol should be given with meals. It should not be given to pregnant or nursing animals and should not be used in puppies.