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Related Experiment Videos

Dose-response relationships with antihypertensive drugs.

G D Johnston1

  • 1Department of Therapeutics and Pharmacology, Queen's University of Belfast, Northern Ireland.

Pharmacology & Therapeutics
|January 1, 1992
PubMed
Summary

Many antihypertensive drugs are prescribed at excessively high doses, leading to unnecessary adverse effects. Dose-escalating studies often result in suboptimal dosing; parallel group designs are recommended for better antihypertensive drug evaluation.

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Area of Science:

  • Pharmacology
  • Clinical Medicine
  • Drug Safety

Background:

  • Many antihypertensive medications have been introduced using high-dose regimens.
  • Common examples include thiazide diuretics, beta-blockers (propranolol, oxprenolol, atenolol), methyldopa, hydralazine, and captopril.
  • These high doses often stem from dose-escalating studies aiming for therapeutic effect or managing adverse events.

Purpose of the Study:

  • To evaluate the impact of high-dose antihypertensive drug regimens.
  • To identify the adverse effects associated with current high-dose prescribing practices.
  • To propose alternative study designs for more accurate antihypertensive dose-response assessment.

Main Methods:

  • Review of clinical practices and study designs for antihypertensive drug introduction.

Related Experiment Videos

  • Analysis of adverse effects linked to specific high-dose antihypertensive drugs.
  • Comparison of dose-escalating study designs with parallel group designs.

    • Main Results:

    • Excessively high doses of various antihypertensive drugs are common in clinical practice.
    • High doses frequently lead to unnecessary and severe adverse effects, including biochemical disturbances, nephrotic syndrome, taste disturbances, neutropenia, lupus syndrome, and central nervous system effects.
    • Dose-escalating study designs often contribute to suboptimal and potentially harmful dosing strategies.

    Conclusions:

    • Current high-dose prescribing of antihypertensive drugs results in avoidable adverse events.
    • The prevalent dose-escalating study design is inadequate for determining optimal antihypertensive drug doses.
    • Parallel group designs with single doses and adequate statistical power are recommended to better define antihypertensive dose-response relationships and improve patient safety.