Metoprolol is a selective β1 receptor blocker medication. It is used to treat high blood pressure, chest pain due to poor blood flow to the heart, and a number of conditions involving an abnormally fast heart rate. It is also used to prevent further heart problems after myocardial infarction and to prevent headaches in those with migraines. 
Dosage: The dosage of this medicine depends on the prescription and instruction given by your doctor.
Precautions: Do not take this medicine without any medical consultation with your doctor.