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Azathioprine is used in dogs and cats for the treatment of autoimmune diseases. Azathioprine is not FDA approved for use in veterinary medicine however, it is a commonly accepted practice for veterinarians to prescribe this medication for dogs and cats.
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Item# Size/Desc Qty Price
50 mg per tablet
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**Note: This product requires a veterinarian's prescription to purchase.At checkout you will need to provide your veterinarian's FAX or email address. We will then send him or her a prescription verification that he or she will need to sign and return before we can ship you this product.

Dosage And Administration:

It is important to follow your Veterinarian's prescription instructions for your pet.

Azathioprine comes in 50 mg tablet forms. The normal dosage for dogs is 0.5 to 1.0 mg per pound 1 to 2 mg/kg administered orally on a daily basis. Cats could be given 0.15 mg per pound 0.3 mg/kg daily.


As azathioprine is a powerful immunosuppressive drug, prescription and administration of this drug should be done with utmost care. Animals allergic to Azathioprine should not be treated with this medication. Cats are highly vulnerable to its immuno suppressant actions hence should only be given very low doses, that too only if found extremely essential. Azathioprine could interact with other medications such as some muscle relaxants and allopurinolDogs and cats could be susceptible to azathioprine as they do not have enzymes to metabolize azathioprine. So it is recommended to get their blood tests done regularly to verify the number of blood cells.

Possible Side Effects:

Symptoms like lethargy, fever, and loss of appetite should be brought to the notice of the veterinarian immediately. It is common for the animals on azathioprine to develop transient diarrhea, which should be of no concern unless the diarrhea continues for long. In some animals, vomiting due to the drug-induced condition of pancreatitis is also seen, which should be attended to promptly.