What is a normal hr for a man 53 years old and is metaprolol good for keeping it down?

60-90 beats per min. Depending on the overall health of the individual or accompanying disease condition like fever or inflammation, an adult person's heart rate may vary as above. If it has been determined by physician that a person has tachycardia, or fast heart rate, medication like metoprolol can be used to keep it down.