the effects of intravenously administered fentanyl ( 25 micrograms/kg , n = 9 ; 50 micrograms/kg , n = 5 ) and alfentanil ( 12.5 micrograms/kg , n = 5 ; 25 micrograms/kg , n = 7 ) on the noxiously evoked , single-unit activity of cells in the nucleus reticularis gigantocellularis ( nrgc ) were studied in decerebrate cats .
C0015846
fentanyl
C0002026
alfentanil