intracisternal ( i.c . ) administration ( 25 microgram or 42.6 nmol ) of the potent met-enkephalin analog , d-ala2-met-enkephalinamide ( dala ) in adult male rats increased plasma concentrations of norepinephrine and epinephrine for more than 90 min .
C0028351
norepinephrine
C0014563
epinephrine