It's a beta blocker, prescribed for hypertension, and heart related symptoms (ie palpitations), and it's often used on an as needed basis for
people with stage fright
, or fear of giving public demonstrations, etc.
It can be effective for anxiety, and is frequently prescribed for anxiety. How did your doc instruct you to take it? Daily? Or as needed? One of the biggest concerns is a drop in blood pressure. As long as your BP doesn't run exceedingly low, it shouldn't be a concern.