This symptom shows up often enough. For some it gets bad enough that they stop altogether. I think the rise in heart rate is part of what sets it off, though not the only factor. It seems to kick the fight-or-flight response into gear.
I began Reta on June 16th with a 2 mg dose and have kept to that amount once a week. Has anyone else run into more anxiety or other mental side effects while on Reta? I have been dealing with quite a bit of it, though I cannot say for certain the medication is to blame.