I've been taking 1mg of xanax xr a night for awhile now and my dr recently increased it to add 0.5mg in the morning. Well, the office faxed my rx over to the pharmacy and I picked it up and brought it home. When I went to take it that night I realized that it was 2mg tabs instead of 0.5mg tabs but I just thought that my dr decided to increase it more, you know? I took 4mg (2 tabs) for a couple of nights and it was awful :( I slept all night and all day and I was basically high and now I feel like I'm probably going through withdrawals since I had to decrease it again. I'm back to 1.5mg a day. I called my PA about it and she was NOT happy. The pharmacy had to write it up and got in trouble.
So the moral of my story is this; always double check your dosage!