dihydroerigotamine differs from ergotamine in the following respect: (A) It is more potent oxytocic, (B) it has antimetic propey, (C) it has high oral bioavailability, (D) it is more potent alpha adrenergic blocker and less potent vasoconstrictor
Answer is D. hydrogenation of ergot alkaloids decrease their vasoconstrictor action and increase the Alpha blocking activity Ref-KDT 6/e p168