adrenergic neuronal blocking agent

n.
  1. A drug that blocks sympathetic nerve impulses but does not inhibit the responses of adrenergic receptors to epinephrine and other adrenergic amines.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.