Your doctor will perform blood tests to make sure you do not have conditions that would prevent you from safely using azathioprine.
Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
When given for kidney transplant, azathioprine is usually given right before or on the day of transplant. For rheumatoid arthritis, azathioprine is taken on a daily basis.
It may take up to 8 weeks before your symptoms improve. Keep using azathioprine as directed and tell your doctor if your symptoms have not improved after 12 weeks of use.
Take with food if azathioprine upsets your stomach.
You may not be able to continue taking other arthritis medications together with azathioprine. Do not change your dose or dosing schedule without your doctor's advice.
Azathioprine affects your immune system. You may get infections more easily, even serious or fatal infections. Your doctor will need to examine you on a regular basis.
Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.
 Detailed Azathioprine dosage information
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What happens if I miss a dose?
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
