Mechanism of action: prazosin ()( ) A: alpha-1 receptor blocker B: beta receptor blocker C: phosphodiesterase inhibitor D: calcium channel blocker

c) When administration of a proton-pump inhibitor or an H2-receptor blocker produces an immediate increase in gastric pH but ulcer healing that is delayed, because _______.

A drug combine with the receptors and show its effects, the drug is called A: partial agonist B: agonist C: noncompetitive antagonist D: competitive antagonist E: blocker