in ganglion-blocked shr , the smaller dose of diltiazem antagonized by 40 and 80 % the pressor effects of norepinephrine and b-ht 920 , respectively , but failed to change the vasoconstrictor responses of phenylephrine , epinephrine , or vasopressin , which were , however , reduced by the higher dose of diltiazem .
C0028351
norepinephrine
C0014563
epinephrine