Vagal stimulation causes bradycardia, which can be blocked by
Bradycardia due to vagal stimulation is elicited by activation of muscarinic receptor in the heart. Atropine, which is an antagonist at M receptors, blocks bradycardia elicited by stimulation of the vagus, including reflex bradycardia due to increases in mean BP caused by vasoconstrictors.
atenolol
atropine
doxazosin
phenylephrine
A.N.S.