these results suggest that imidazole-derived h2-receptor antagonists ( cimetidine and etintidine ) and non-imidazole h2-receptor antagonists ( famotidine , ranitidine and tzu-0460 ) compete with histamine at different sites on the h2-receptor of the gastric glands .
C2757005
h2-receptor antagonists
C0034665
ranitidine