two h1 receptor antagonists , mepyramine ( 10 ( -6 ) m ) and pyrobutamine ( 10 ( -7 ) m ) , each competitively blocked the histamine activation of the ns cells , but an h2 receptor antagonist cimetidine ( 10 ( -5 ) m ) did not alter the suppressor-enhancing function of histamine .
C2757048
h1 receptor antagonists
C0034282
mepyramine