Beta blocker blues?

Ask the doctor

Q. My doctor added metoprolol to the diuretic medication I'm taking for my high blood pressure. Ever since then, I've felt more tired than usual, and my wife says I seem a little depressed. Could the new drug be to blame, and if so, is there anything I can do about it?

A. Metoprolol (Lopressor, Toprol) belongs to a class of drugs known as beta blockers. These drugs — which make the heart beat slower and with less force — used to be given as a first-choice treatment for high blood pressure. But they can cause fatigue and depression in some people, as well as other side effects, such as erectile dysfunction.