while combined treatment with propranolol ( 3 mg/kg i.v . ) and atropine ( 1 mg/kg i.v . ) abolished both the bradycardic and tachycardic actions of i.c.v . clonidine ( 30 micrograms/kg ) , but did not modulate the hypotensive action .
C0004259
atropine
C0039231
tachycardic