I have been taking 50mg of Imuran (generic) for 5 weeks now. My "Doctor" who is a physician assistant said for me to stay on the 50mg for the remaining two months to see if it will work for me. I got a hold of a Doctor I saw a few months back at a University Medical Center and she said that with my weight, I should have started out on at least 150mg of the Imuran. So in a way I have wasted 5 weeks of this because I was on such a low dose. I weigh 339lbs, so 50mg is not much for my body type. The University Doctor told me that I will probably not achieve remission on such a low dose. So it will be increased to 150mg as of Monday, however I started it today with the prescription that I currently have until I get the new one Monday.