Also Known As: Guanadrel, Hylorel

Guanadrel is an antihypertensive agent. It is used in the form of its sulfate.

Guanadrel is a postganglionic adrenergic blocking agent. Uptake of guanadrel and storage in sympathetic neurons occurs via the norepinephrine pump; guanadrel slowly displaces norepinephrine from its storage in nerve endings and thereby blocks the release of norepinephrine normally produced by nerve stimulation. The reduction in neurotransmitter release in response to sympathetic nerve stimulation, as a result of catecholamine depletion, leads to reduced arteriolar vasoconstriction, especially the reflex increase in sympathetic tone that occurs with a change in position. Guanadrel is rapidly and well absorbed from gastrointestinal tract.[2]

In 1981 the JAMA reported guanadrel as an effective step II or step III treatment of hypertension.[3

Print this Page

All Treatments

Average Effectiveness

This is the Average effectiveness per ailment as reported by our participants (you).

  • 0 = No improvement or Worse
  • 1 = Slight improvement
  • 2 = Moderate Improvement
  • 3 = Significant Improvement
  • 4 = Cured

Order By

Type of Treatment

Date Range

Minimum Number of Users

Complete a survey on Guanadrel to help the CureCrowd community

If you have tried to treat this ailment, please complete the following form to help us better our data, and help guide people to the best possible treatments. CureCrowd is a public resource with absolutely no vested interest in the outcomes of our studies.