You should not use metoprolol if you have a serious heart problem (heart block, sick sinus syndrome, slow heart rate), severe circulation problems, severe heart failure, or a history of slow heart beats that caused fainting.
Before taking this medicine
You should not use this medicine if you are allergic to metoprolol, or other beta-blockers (atenolol, carvedilol, labetalol, nadolol, nebivolol, propranolol, sotalol, and others), or if you have:
a serious heart problem such as heart block, sick sinus syndrome, or slow heart rate;
severe circulation problems;
severe heart failure (that required you to be in the hospital); or
a history of slow heart beats that have caused you to faint.
To make sure this medicine is safe for you, tell your doctor if you have:
asthma, chronic obstructive pulmonary disease (COPD), sleep apnea, or other breathing disorder;
diabetes (taking metoprolol may make it harder for you to tell when you have low blood sugar);
liver disease;
congestive heart failure;
problems with circulation (such as Raynaud's syndrome);
a thyroid disorder; or
pheochromocytoma (tumor of the adrenal gland).
Do not give this medicine to a child without medical advice.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known whether metoprolol will harm an unborn baby. However, having high blood pressure during pregnancy may cause complications such as diabetes or eclampsia (dangerously high blood pressure that can lead to medical problems in both mother and baby). The benefit of treating hypertension may outweigh any risks to the baby.
Ask a doctor before using this medicine if you are breast-feeding. Metoprolol can pass into breast milk and may cause dry skin, dry mouth, diarrhea, constipation, or slow heartbeats in your baby.
