slow relase compared to immitidate releasemetoprolol
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- Responded 15 Jul 2019 · The NLM's Daily Med have an entry for metoprolol succinate extended-release: https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=31d8610a-ab22-49e5-a762-6b08244ee93a This reports: "In five controlled studies in normal healthy subjects, the same daily doses of metoprolol succinate extended-release tablets and immediate-release metoprolol were compared in terms of the extent and duration of beta 1-blockade produced. Both formulations were given in a dose range equivalent to 100 to 400 mg of immediate release metoprolol per day. In these studies, metoprolol succinate extended-release tablets were administered once a day and immediate-release metoprolol was administered once to four times a day. A sixth controlled study compared the beta1- blocking effects of a 50 mg daily dose of the two formulations. In each study, beta1-blockade was expressed as the percent change from baseline in exercise heart rate following standardized submaximal exercise tolerance tests at steady state. Metoprolol succinate extended-release tablets administered once a day, and immediate-release metoprolol administered once to four times a day, provided comparable total beta1-blockade over 24 hours (area under the beta1-blockade versus time curve) in the dose range 100 to 400 mg. At a dosage of 50 mg once daily, metoprolol succinate extended-release tablets produced significantly higher total beta1-blockade over 24 hours than immediate-release metoprolol." Conflict of interest declaration: None
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