glucagon administered either intravenously ( iv ) ( 100-1000 micrograms/kg ) or intracerebroventricularly ( icv ) ( 5 micrograms ) significantly attenuated morphine-induced ( 200 micrograms/kg , iv ) bradycardia without producing any alterations in cardiovascular parameters when given alone .
C0017687
glucagon
C0428977
bradycardia