<prompt> Dihydroergotamine differs from ergotamine in the following respect :It is a more potent oxytocicIt has antiemetic propertyIt has high oral bioavailabilityIt is more potent α-adrenergic blocker and less potent vasoconstrictor  <response>: Hydrogenation of ergot alkaloids decrease their vasoconstrictor action and increase the α-blocking activity. 