Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Metoprolol" Definition
noun
A selective β1 receptor blocker used in treatment of several diseases of the cardiovascular system, especially hypertension.
Source: Wiktionary
A beta-blocker CHNO used in the form of its succinate and tartrate especially to treat hypertension and angina pectoris.
Source: Merriam-Webster
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