I also cannot tell I took anything until the XR doses mix with each other. Then it’s almost identical to the suppression delivered by the vyvanse. I asked her about IR the day I sent the reply to you about your experience. She did not want to at all prescribe the IR medication to me until I had first tried the XR. I’m concerned as well. I’m sure now she will want to up the mg, which is fine, but I’ve read a lot about “tolerance”. I’m 40 and haven’t ever asked for help with ADD because I’ve always been against pharmaceuticals. After experiencing the way this medication works, it’s no longer possible for me to deny my issues, and that there is a solution.