Unfortunately, I made this mistake once. I took metoprolol but my blood pressure wouldn't go down. It was too high. So I took more to try to bring it down. It was a big mistake. I soon felt dizzy and confused. I called my daughter who took me to the hospital and I was treated for an overdose. They told me never to take more medications when my blood pressure doesn't fall. They asked me to go in to the hospital instead.