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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Itâs important to see an ear, nose and throat specialist when the hoarseness is associated with: 1  Duration of more than three weeks. 2  Absence of a cold or flu. 3  Coughing up blood. 4  A lump in the neck. 5  Pain when swallowing or talking. 6  Trouble breathing that coincides with the onset of symptoms. 7  Trouble swallowing.