The Correct Option is
C
Phenoxybenzamine binds covalently to the alpha receptor, thereby producing an irreversible (insurmountable) blockade. The other agents are competitive pharmacologic antagonists - ie, their effects can be surmounted by increased concentrations of agonist. This difference may be important in the treatment of pheochromocytoma, because massive releases of catecholamines from the tumor may overcome a reversible blockade.
Category:
Pharmacology MCQs
POST COMMENT
0 comments:
Post a Comment