A pharmaceutical composition, useful for treating animals of the mammalian species, including humans, to treat diseases and conditions which normally respond to treatment with alpha.sub.2 adrenergic agents, contains as its active alpha.sub.2 adrenergic agent ingredient one or more compounds of the formula ##STR1## where X is O, S or NH; n is an integer with the values of 0, 1 or 2; when n is 0 then R.sub.1 is lower alkyl having 1 to 6 carbon atoms and R.sub.2 is H or lower alkyl having 1 to 6 carbon atoms; when n is 1 or 2, then R.sub.1 and R.sub.2 both are methylene (CH.sub.2), or methylene substituted with an R.sub.5 group where R.sub.5 is lower alkyl of 1 to 6 carbons; R.sub.3 and R.sub.4 independently are H or lower alkyl having 1 to 6 carbons; R.sub.6 is H or lower alkyl of 1 to 6 carbons.
一种药物组合物,用于治疗哺乳动物物种,包括人类,以治疗通常对α.sub.2
肾上腺素能受体药物治疗有反应的疾病和症状,其活性成分为一个或多个化合物,其
化学式为 ##STR1## 其中X为O,S或NH; n为整数,取值为0、1或2; 当n为0时,R.sub.1为1至6个碳原子的低烷基,R.sub.2为H或1至6个碳原子的低烷基; 当n为1或2时,R.sub.1和R.sub.2都是亚甲基(CH.sub.2),或者是被R.sub.5基取代的亚甲基,其中R.sub.5是1至6个碳原子的低烷基; R.sub.3和R.sub.4独立地是H或1至6个碳原子的低烷基; R.sub.6为H或1至6个碳原子的低烷基。