Please do not be upset by this...it is common until they find the right dosage for you, unfortunately it is a trial and error thing. I was on 75 mgs and had to go down to 50 mgs; I was really upset at the time but it wasn't that big a deal when I look back at it now.
What I had to do is stop taking 6-mp for 3 or 4 days and then lower the dose to 50 mgs; I went back for blood work the following week and it was back in acceptable ranges.
My family doc says the normal LFTs for anyone (not on Meds) is within 60 but my GI says that it is 40 and below. My GI wants the LFTs below 80 if he has a patient on 6-mp/imuran; he told me that some GIs will accept 120 and below. My LFTs are in the 30's right now.
DX'd with Pan-Colitis June 2005
Current Status: Flaring since May
Current Meds: 6-mp & Colocort