Metoprolol (/mɛˈtoʊproʊlɑːl/ /mɛtoʊˈproʊlɑːl/) is a selective β1 receptor blocker used in treatment of several diseases of the cardiovascular system especially hypertension. The active substance metoprolol is employed either as metoprolol succinate or as metoprolol tartrate (where 100 mg metoprolol tartrate corresponds to 95 mg metoprolol succinate). The tartrate is an immediate-release and the succinate is an extended-release formulation.
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