... procedures. I have been on xanax ir for several years. 2mgs tid. On the 13 of January I told my p-doc that i thought I was building up a tolerance because after 2-3 hours i needed another dose. He switched me to the xr version. I am having panic attacks when I have to leave the house. Should I go back to ir xanax or ask for k-pin? I go Tuesday for a med check.