anxiety
"A doctor prescribed this for hypertension, based upon his premise that mine was caused by anxiety. That was almost 40 years ago. After arguing back and forth, I agreed to take it on a limited basis. Now I use 2 mg, 4 times a day as needed, but only before lying down and never when I will be driving or need to otherwise be alert. It is a great help when I do get overly anxious, as I am prone to do. I consider it useless if I am up and about."