@kathigg When a person's heart is behaving and beating normally, in sinus rhythm, metoprolol at a even a low or a moderate dose might cause the rate to drop low, but also still cause the beats' contractions, themselves, to be weak and to lower blood pressure. Between the slow beats and the weak contractions, you might be headed for a .....header. A fall. Fainting. You want to avoid that like the plague. So, please contact your primary care provider in the morning and let that person know what you have learned about your heart rate. They should know you're on metoprolol. Let your cardiologist know as well. Between those two, one of them should help you to avoid trouble with low blood pressure.