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Systemic and cardiac hemodynamic interactions between clonidine and minoxidil
Clinical Pharmacology and Therapeutics
|August 1, 1981
Summary
Clonidine effectively lowers blood pressure and heart rate in hypertensive patients. Combined with minoxidil, it further reduces blood pressure and counteracts minoxidil-induced sympathetic activity.
Area of Science:
- Cardiology
- Pharmacology
Background:
- Refractory or accelerated hypertension requires potent therapeutic strategies.
- Minoxidil is a powerful antihypertensive vasodilator but can increase sympathetic nervous activity.
Purpose of the Study:
- To investigate the hemodynamic interactions between clonidine and minoxidil in patients with severe hypertension.
- To assess the efficacy of clonidine in counteracting minoxidil-induced sympathetic stimulation.
Main Methods:
- A study involving 10 inpatients with refractory or accelerated hypertension.
- Administration of oral clonidine (150-900 micrograms/day) followed by minoxidil (5-22.5 mg/day).
- Hemodynamic parameters including blood pressure, heart rate, blood flow, plasma renin activity, and cardiac resistance indices were monitored.
Main Results:
- Clonidine significantly decreased mean blood pressure, heart rate, limb blood flow, and plasma renin activity.
- Minoxidil addition further reduced mean blood pressure and increased pre-ejection period index.
- The combination therapy demonstrated a significant decrease in limb vascular resistance and total peripheral resistance.
Conclusions:
- Clonidine effectively manages hemodynamic changes associated with severe hypertension.
- Clonidine can serve as an alternative to beta-adrenergic blockers for mitigating minoxidil-induced sympathetic hyperactivity.