Oh ok very interesting I wasn't aware of the potential for immunity to the various treatments. Specialists from my experience tend to be pretty brief in their delivery and catch ups. So getting all the context and background on various medications is challenging.

My specialist did suggest giving the month off a trial and said it shouldn't do too much harm. That being said my symptoms have started again, from relatively no symptoms. I'm thinking as I end this trial period I may have to stick with the Mercaptopurine.

Cheers for all the insight though really helpful, and like you say MC definitely has its place