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Hi and thanks for the query.
Metoprolol tartrate (Lopressor) is a regular, immediate-release tablet, while metoprolol succinate (Toprol XL) is an extended-release. The active ingredient in both is the same, that is the beta blocker Metoprolol. The difference is that Metoprolol succinate is an extended-release version of metoprolol, so it remains in the bloodstream and controls blood pressure for a full 24 hours. Metoprolol tartrate does not stay in the bloodstream for 24 hours.
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