I have been on 6mp(75mg) for 7 months and off all steroid for 1 month. I am feeling fine but still have blood with every BM. Doctors have checked my thiopurine levels and they are actually high but my liver function and CBC are fine so he is not concern. But I don't think, it is helping fully.
I get tired very quickly but not sure it is medicine or uc itself.
Before you start imuran, your doctor should do TPMT blood test. Also while on imuran, check your liver function and CBC frequently. Your doctor might do test to check thiopurine levels to optimise treatment.
Hope it works for you and you enjoy long remmission.