Pharmacology General ef4c4401 Dihydroergotamine differs from ergotamine in the following respect : A It is a more potent oxytocic B It has antiemetic property C It has high oral bioavailability D It is more potent α-adrenergic blocker and less potent vasoconstrictor High-Yield Explanation Hydrogenation of ergot alkaloids decrease their vasoconstrictor action and increase the α-blocking activity.