The compounds are substituted 1,2,4-triazin-5-ones which are histamine H.sub.2 -antagonists. Two specific compounds of the present invention are 3-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-6-(3-methoxybenzyl)-1,2, 4-triazin-5-one and 3-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-6-(3-pyridylmethyl)-1,2, 4-triazin-5-one.
这些化合物是替代了
1,2,4-三嗪-5-酮的组合物,可以作为
组胺H.sub.2受体拮抗剂。本发明的两个具体化合物是3-[2-(5-甲基-4-
咪唑基甲
硫基)乙基
氨基]-6-(3-
甲氧基苯基)-
1,2,4-三嗪-5-酮和3-[2-(5-甲基-4-
咪唑基甲
硫基)乙基
氨基]-6-(3-
吡啶甲基)-
1,2,4-三嗪-5-酮。