Abstract: Carbostyril derivatives of the general formula ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group or a phenyl-lower alkyl group and R.sup.2 and R.sup.3 may be the same or different and each is a substituted or unsubstituted lower alkyl group, or R.sup.2 and R.sup.3 may form, together with the adjacent nitrogen atom, a 5- or 6-membered saturated heterocyclic ring which may be substituted or unsubstituted. The derivatives are useful as the active ingredient in cardiotonic compositions.

Abstract: Novel carbostyril derivatives and their pharmaceutically acceptable salts represented by the formula (I) ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group or a phenyl-lower alkyl group; R.sup.2 and R.sup.3 may be the same or different and each is a lower alkyl group which may have one hydroxy group or one halogen atom as the substituent, or a phenyl-lower alkyl group which may have 1 to 3 substituents selected from the group consisting of a lower alkoxy group and a halogen atom on the phenyl ring, or said phenyl-lower allkyl group may have a lower alkylenedioxy group as the substituent on the phenyl ring; further R.sup.2 and R.sup.

Abstract: Novel carbostyril derivatives and their pharmaceutically acceptable salts represented by the formula (1). ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group or a phenyl-lower alkyl group, R.sup.2 and R.sup.3 form, together with the adjacent nitrogen atom and further with an additional oxygen atom, a 5- or 6-membered saturated heterocyclic ring which may have a lower alkyl group or a phenyl-lower alkyl group as the substituent; the carbon-carbon bond between 3- and 4-positions in the carbostyril skeleton being a single or double bond. The derivatives are useful as the active ingredient in cardiotonic compositions.

Abstract: A piperazinylcarbostyril compound of the formula (I) ##STR1## wherein R.sup.1 represents a hydrogen atom, a lower alkyl group, a lower alkenyl group, a lower alkynyl group, or a phenyl-lower alkyl group;R.sup.2 represents a hydrogen atom or a lower alkoxy group;R.sup.

Abstract: A carbostyril compound of the formula (I) ##STR1## wherein the values of the substituents are as defined in the description, and pharmaceutically acceptable salts thereof, composition containing the compound of the formula (I) or its pharmaceutically acceptable salt as an active ingredient, and process for preparing same. The compound of the formula (I) and its pharmaceutically acceptable salts have cardiotonic effects.