as further examined in cortical membranes , this effect on both gaba and benzodiazepine binding sites was specific for imidazole-derived h2-receptor antagonists ( potency : cimetidine greater than metiamide greater than tiotidine ) and not observed with either several h1-receptor antagonists or histamine .
C2757005
h2-receptor antagonists
C0008783
cimetidine