Imuran is a medication given to prevent rejection and taken once a day. It is an older relative of CellCept and sometimes used in its place. How Imuran Is Supplied. Imuran comes as a 50 mg tablet that can be broken up. Some pharmacies, including the outpatient pharmacy at Cincinnati Children's, can also prepare a liquid version of Imuran for patients who have trouble taking the tablet. Myasthenia gravis is a disease in which there is a malfunction in the transmission of signals between the nerves and muscles. Dogs with myasthenia gravis exhibit extreme weakness and excessive fatigue. There are two forms: inherited and acquired, and treatment is with a class of medication that inhibits a nervous system enzyme called acetylcholinesterase. azathioprine (Azasan, Imuran), methotrexate (Trexall, Rheumatrex), or cyclophosphamide, which are all medications that suppress the immune system cancer treatments, such as chemotherapy, biologic. Drugs.com provides accurate and independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. Data sources include IBM Watson Micromedex (updated 11 Oct 2021), Cerner Multum™ (updated 1 Nov 2021), ASHP (updated 14 Oct 2021. Imuran - Uses, Side Effects, and More Generic Name: azathioprine Azathioprine is used to prevent organ rejection in people who have received a kidney transplant. Azathioprine (Imuran®) is a medication that treats diseases that have to do with your immune system. It’s been used in some patients with multiple sclerosis (MS), usually if they have problems with standard FDA-approved medications for their MS. Studies have shown that azathioprine can reduce the number of flare-ups in patients with relapsing MS. It also can reduce new MRI lesion formation. Imuran side effects. Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. Imuran may cause a serious brain infection that can lead to disability or death. Call your doctor right away if you have problems with speech, thought, vision, or muscle movement.