Metoprolol is the generic form of the brand-name drug Lopressor, prescribed to treat high blood pressure and prevent angina (chest pain). Metoprolol is a type of medication called a beta blocker. It works by relaxing blood vessels and slowing heart rate, which improves blood flow and lowers blood pressure.
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A chest physician--a respiratory specialist. Sometimes called a Pulmonologist. These chaps might call in a cardiologist just to check that the heart rhythms are ok. And they also may consult with an Ear, Nose and Throat (ENT) specialist depending on what they find.