the enhancement was not inhibited by yohimbine ( 10 ( -5 ) m ) , phentolamine ( 10 ( -5 ) m ) , or the histamine h1- or h2-receptor antagonists mepyramine ( 10 ( -6 ) m ) or cimetidine ( 10 ( -5 ) m ) respectively .
C2757005
h2-receptor antagonists
C0008783
cimetidine