Abstract: Compounds of the formula: ##STR1## wherein: m is 0 or 1;R.sup.1 is hydrogen, hydroxy, or lower alkyl;R.sup.2 is hydrogen, or lower alkyl;R.sup.3 is ##STR2## or R.sup.2 and R.sup.3 taken together with the nitrogen atom to which they are attached represent a group of the formula: ##STR3## wherein: n is 0 or 1;p is 0, 1, 2 or 3;q is 0 or 1;R.sup.4 is hydrogen, lower alkyl, cycloalkyl, or optionally substituted phenyl;R.sup.5 is optionally substituted phenyl;X is (CH.sub.2).sub.p, or 4-piperidin-1-yl;Y is CH, CH--O--, CH--S--, or nitrogen;Z is CH.sub.2, NH, sulfur, or oxygen; andA is a substituted furanyl group.

Abstract: Compounds of the formula: ##STR1## wherein A, R.sup.1, R.sup.2, R.sup.3 and m are defined as in the specification or a pharmaceutically acceptable acid addition salt or N-oxide thereof, are calcium and sodium channel antagonists useful for treating mammals having a variety of disease states, such as stroke, epilepsy, hypertension, angina, migraine, arrhythmia, thrombosis, embolism, and also for treatment of spinal injuries.

Abstract: Carbostyril derivatives of Formula I: ##STR1## wherein: m is 0, 1, or 2;n is 0, 1, or 2;R.sup.1 is hydrogen or lower alkyl;R.sup.2 is hydrogen, halogen, hydroxy, lower alkyl, lower alkoxy, aralkoxy, or acyloxy;R.sup.3 is hydrogen, halogen, lower alkyl, or lower alkoxy;R.sup.4 is hydrogen, hydroxy, lower alkyl, acyloxy, provided that when R.sup.4 is hydroxy or acyloxy, m and n are both 1;R.sup.5 is hydrogen or lower alkyl; andR.sup.6 is alkyl, hydroxyalkyl, alkoxyalkyl, or (dialkylamino)alkyl;and the pharmaceutically acceptable acid addition salts and N-oxides (at the carbostyril nitrogen) thereof, and compositions containing them, are useful in treating cardiovascular diseases, particularly arrhythmias. Methods of preparing intermediates, the compounds, their formulations and methods of treatment therewith are also disclosed.