Azathioprine
Also known as: Imuran · Azasan
Azathioprine is a long-standing immunosuppressant that has helped many patients with autoimmune rheumatic conditions live more settled lives. Used well, with the right checks, it is a reliable option.
Calm, careful medication review by a consultant rheumatologist.
What this medicine is
Azathioprine is a tablet that reduces overactive immune activity. It is often used to keep autoimmune disease in remission after stronger initial treatments.
Uses and context
It is used in lupus, vasculitis, inflammatory myositis, and some overlap conditions. It may also be used in inflammatory bowel disease and after transplants, under other specialists.
How this relates to rheumatology care
Before starting, I check a TPMT enzyme level, baseline blood counts, and liver function. Dosing is tailored to you, and blood tests are done regularly, more often in the first months.
What safety checks may matter
TPMT enzyme level before starting where available
Baseline full blood count and liver function
Regular blood tests, more frequent early on
Screen for hepatitis B and other infections as advised
Skin protection and regular skin checks (increased skin cancer risk long term)
Side effects and red flags
If you have emergency symptoms such as severe allergic reaction, breathing difficulty, chest pain, stroke-like symptoms, severe abdominal pain, vomiting blood, black stools, sudden vision loss, severe infection symptoms, or severe weakness or confusion, please seek urgent medical care first rather than waiting for a WhatsApp reply.
Unexplained bruising, bleeding, or unusual tiredness
Persistent fever, chills or sore throat
Yellowing of the skin or eyes
Severe abdominal pain or pancreatitis-type pain
A new or changing skin lesion
Signs of severe allergic reaction
Things worth knowing day to day
Avoid live vaccines while on azathioprine unless discussed with me.
Protect your skin from the sun and attend skin checks.
Do not combine with allopurinol or febuxostat without medical adjustment.
Tell me about any planned pregnancy; azathioprine is often continued in pregnancy under review.
Questions patients often ask me about this medicine
Speak with me
If azathioprine has been suggested or you are already on it and have questions, please message my clinic. I would like to keep you safe and well while it works.
Other medications used in rheumatology care
This page is for general education only and does not replace medical advice. Please consult a qualified healthcare professional for diagnosis and treatment. Do not start, stop, or change any medicine without advice from your doctor.