Start the Imuran, but expect to wait 2-3 months for an improvement.
Ask your gasteroenteroligist about
a infliximab/remicade minimum (trough) concentration and antibody bloodtest. Prometheus labs out of CA invented that test, still charges a premium for it, and here's more info on it Anser IFX test:
https://www.anserifx.com/about
.aspx
However, Labcorp and other labs can do a generic version of that test that is just as good.
testmenu.labcorp.com/test-menu/infliximab-concentration-and-anti-infliximab-antibody/a1948211-4072-4432-8b80-43eea8d3e682The test will tell you what is the minimum amount of remicade in your system 24 hours prior to your next infusion and that is helpful with dosing. Low concentrations mean you do not have enough remicade and your dose needs to be increased.
The test will also tell you if your immune system has developed any antibodies that would make remicade less effective or even stop working entirely. If you have some antibodies then a simple dose increase could work to counteract it. Very high antibodies could mean switching to another tnf-alpha-blocking biologic like humira or simponi would be effective for you.
High concentrations of remicade and zero antibodies would mean that you've failed remicade and likely that entire class of biologic medications. In that eventuality, it would be smart to change to another class of biologics like entyvio. Stelara is off label but another option.