Do not take this medicine with any of the following medications:
-febuxostat
-mercaptopurine

This medicine may also interact with the following medications:
-allopurinol
-aminosalicylates like sulfasalazine, mesalamine, balsalazide, and olsalazine
-leflunomide
-medicines called ACE inhibitors like benazepril, captopril, enalapril, fosinopril, quinapril, lisinopril, ramipril, and trandolapril
-mycophenolate
-sulfamethoxazole; trimethoprim
-vaccines
-warfarin

They need to know if you have any of these conditions:
-infection
-kidney disease
-liver disease
-an unusual or allergic reaction to azathioprine, other medicines, lactose, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast feeding

Visit your doctor or health care professional for regular checks on your progress. You will need frequent blood checks during the first few months you are receiving the medicine.

If you get a cold or other infection while receiving this medicine, call your doctor or health care professional. Do not treat yourself. The medicine may increase your risk of getting an infection.

Women should inform their doctor if they wish to become pregnant or think they might be pregnant. There is a potential for serious side effects to an unborn child. Talk to your health care professional or pharmacist for more information.

Men may have a reduced sperm count while they are taking this medicine. Talk to your health care professional for more information.

This medicine may increase your risk of getting certain kinds of cancer. Talk to your doctor about healthy lifestyle choices, important screenings, and your risk.

Keep out of the reach of children.

Store at room temperature between 15 and 25 degrees C (59 and 77 degrees F). Protect from light. Throw away any unused medicine after the expiration date.