| abstract |
A dihydropyridine of the formula: <IMAGE> wherein R1 and R2 each is alkyl, alkenyl or alkoxyalkyl, wherein R3 and R4 each is alkyl, wherein benzene ring A is unsubstituted or bears one or more additional substituents selected from halogeno, cyano, nitro, trifluoromethyl and alkyl, or bears the substituent =N-O-N= attached to the 5- and 6-positions, wherein Ar is as defined in the specification, wherein p is 0 or 1, wherein X is -O- or -S-, and wherein Y is straight-or branched-chain alkylene or alkenylene each of 2 to 12 carbon atoms which may optionally be interrupted by one or two groups selected from oxygen, sulphur, imino, substituted imino, phenylene, substituted phenylene, pyridylene, cycloalkylene, 1,4-piperazinediyl, 1,4-piperidinediyl and amido groups; or an acid-addition salt thereof, processes for their manufacture and pharmaceutical compositions containing them. The compounds possess either beta-adrenergic blocking or calcium ion slow channel blocking properties, or both such properties, and may be used in the treatment of hypertension. |