<prompt> dihydroerigotamine differs from ergotamine in the following respectIt is more potent oxytocicit has antimetic propeyit has high oral bioavailabilityit is more potent alpha adrenergic blocker and less potent vasoconstrictor  <response>: hydrogenation of ergot alkaloids decrease their vasoconstrictor action and increase the Alpha blocking activity Ref-KDT 6e p168 