I too am prescribed 8mgs xanax. I am tapering under a doctors care. It has been nearly two weeks and I am at 6.5mg (this may seem fast, but the taper plan calls for a rapid taper down to 5mg, then a slower taper down to 2mg, and lastly an inchworm crawl from 2mg to 0). I also take 30mg temazepam a night. Yes I have been noticing cognitive impairment...its subtle. I will reread something I have posted and it will be missing key words that I swore I added to the post in question. Sometimes I lose my train of thought mid sentence or cannot remember the name of a certain thing I am describing causing me to say "whats'its'name" way more than I would like to.
I do not get any of the positive effects I once got from xanax. In the beginning they were a true lifesafer. My panic disorder and OCD would be mitigated to a point of leading a normal life, however, after a while they lose the positive effects and all you are left with is a dependence in which the only difference from not taking them is that I have an intense resurgence of my intrusive thoughts and compulsions. Xanax is not a recreational benzo whatsoever. It has led to many DUI's, failed marriages, and arrests due to benzo blackouts. The problem is you, as the user, do not feel that high so you end up redosing. You then still don't feel high (even though everyone around you knows due to you slurring your words and stumbling on the simplest of ideas) so you take more. Next thing you know, you have time traveled and have to piece together the previous day/s through your outgoing/incoming texts and calls, and pieces of conversation from friends...or at the most extreme you will have to piece it together from the arresting officer's statement.
The reason I can take 8mg and I do not black out, or experience the relief I used to is due to tolerance. If you are not tolerant of benzos I would steer clear of high dosing on xanax, or any of the other drugs in this classification. They are not recreational, and often are the culprit in fatal overdoses involving other Central Nervous Suppressants.
ps: Hey T. Calderone how you doing? I am switching insurance in january so here is crossing my fingers!!! Pray for me and I will pray for you.