Well I have been taking Azathiaprine for two weeks and wonder how quick they work. On Friday got some slight pain in the back area and now it is slightly worse. Have MRI scan next week to see about the lesions - scared, not the actual scan but what it is going to reveal. I asked my GP why it takes so long to get a scan date and she said she doesn't know why but some people waitng anything from 6-12 months. It was the consultant who arranged this as had a ultrasound but it was /will be nearly 2 months from the us that I have this appt. And it says Amber on the request. I wonder if anyone had an similar experience?