Abstract: Compounds of formula (I), or a pharmaceutically acceptable salt, quaternized derivative, N-oxide or solvate thereof:R.sub.1 --Ar--(CH.sub.2).sub.a --X--(CH.sub.2).sub.b --NH--Het (I)wherein: the substituents are defined in the specification.The compounds are useful in treating excess gastric acid secretions such as peptic ulcers.

Abstract: Compounds of the formula (I) ##STR1## and salts and pro-drugs thereof, wherein: R.sub.1 is a hydrogen atom or a lower alkyl group;R.sub.2 is a hydrogen atom or a lower alkyl group;R.sub.3 is a hydrogen atom or a lower alkyl group;R.sub.4 is a hydrogen atom or an alkyl group;R.sub.5 is a lower alkyl or a substituted alkyl group;or R.sub.4 and R.sub.5 are joined so that together with the nitrogen atom to which they are attached they form a 5-, 6- or 7-membered ring optionally containing an oxygen or sulphur atom;R.sub.6 is an electron donating group;R.sub.7 is an electron withdrawing group; andthe NR.sub.4 R.sub.5 and OR.sub.3 moieties are trans having compositions containing them and processes for their preparation.

Abstract: Compounds of the formula (I): ##STR1## and salts and pro-drugs thereof, wherein: R.sub.1 is a hydrogen atom or a lower alkyl group;R.sub.2 is a hydrogen atom or a lower alkyl group;R.sub.3 is a hydrogen atom or a lower alkyl group;R.sub.4 is a hydrogen atom or an alkyl group;R.sub.5 is a lower alkyl or a substituted alkyl group;or R.sub.4 and R.sub.5 are joined so that together with the nitrogen atom to which they are attached they form a 5-, 6- or 7-membered ring optionally containing an oxygen or sulphur atom;R.sub.6 is an electron donating group;R.sub.7 is an electron withdrawing group; andthe NR.sub.4 R.sub.5 and OR.sub.3 moieties are trans having antihypertensive activity, pharmaceutical compositions containing them and processes for their preparation.

Abstract: Compounds of the formula (II): ##STR1## and pharmaceutically acceptable acid-addition salts thereof wherein Ar is a pyridyl or optionally substituted phenyl group of the sub-formula --C.sub.6 H.sub.3 R.sub.1 R.sub.2 wherein R.sub.1 is a hydrogen, fluorine, chlorine or bromine atom or a lower alkyl, lower alkoxyl, lower acyl, lower acyloxyl or lower alkoxycarbonyl group; and R.sub.2 is a hydrogen, fluorine or chlorine atom or a lower alkyl or lower alkoxy group having useful anti-hypertension activity, their preparation, and pharmaceutical compositions containing them.

Abstract: Orally administrable pharmaceutical compositions for reducing the rate of gastric acid secretion and acid addition salts thereof containing an effective amount of halo-substituted 2-pyridyl thioureas and a pharmaceutical carrier and a method of treating gastric ulcers and reducing gastric acid secretion with such compositions.