I had high blood pressure years ago, and after taking one or two medications with little success, I was given 25mg of Atenolol, which worked extremely well. Since then, the dose has been increased to 50mg, and that has done the trick--kept my blood pressure under 140/90.
Recently though, I've been having an issue controlling my blood pressure. I felt really crappy a few months ago, and when I came home from a hike, my blood pressure was around 160/100.