SN instructed patient / caregiver regarding medication Metoprolol. Metoprolol is used for treating high blood pressure, heart pain, abnormal rhythms of the heart, and some neurologic conditions; it reduces the force of contraction of heart muscle and thereby lowers blood pressure. Side effects to report to physician ( MD ) when taking Metoprolol including diarrhea, constipation, fatigue, insomnia, nausea, depression, memory loss, fever, lightheadedness, slow heart rate, low blood pressure, cold extremities, sore throat, and shortness of breath or wheezing. If experiencing any of these side effects or when systolic BP is >160 or < 90 and / or diastolic BP is > 90 or < 60 notify physician ( MD )