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- W4289992530 abstract "Plasma concentrations of tolamolol and bufuralol (beta-blocking agents) were measured after oral and intravenous administration to healthy volunteers. The plasma levels of their main metabolite was also determined. Simultaneously, the effect of the drugs on the heart rate and blood pressure was monitored under various stimuli (isoproterenol, exercise or orthostatism) and Valsalva maneuver. When given orally, the two drugs are extensively metabolized by a hepatic first-pass effect. After reaching the systemic circulation, they are metabolized in the liver to hydroxylated derivatives with similar pharmacologic activity as the parent molecule. For tolamolol it is possible to demonstrate a good correlation between parent drug blood levels and the pharmacodynamic effect; this relation is less evident for bufuralol. The pharmacokinetic analysis of the behaviour of the two beta-blocking agents and their main metabolite makes it possible to explain this difference in part. The results of the present study emphasize the importance of measuring metabolites when dose-action relationships are investigated." @default.
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- W4289992530 date "1978-05-20" @default.
- W4289992530 modified "2023-09-29" @default.
- W4289992530 title "[Role of metabolites in the relationship between pharmacokinetics and the effect of beta blockers. Studies on tolamolol and bufuralol]." @default.
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