hydroiodic citric acetic benzoic phosphoric nitric mucic isethionic methanesulfonic p toluenesulfonic glucosaccharic palmitic heptanoic oxalic cyclamic succinic malic fumaric mandelic malonic and others the compounds of the present invention shown by the foregoing structural formula contain an asymmetric carbon atom in the propanolamine side chain and occur as optically active isomers as well as racemic mixtures thereof the present invention is intended to include each of the optically active and racemic forms some of the substances of the present invention contain an asymmetric carbon atom in the x substituent and diastereoisomeric pairs of racemates exist these forms are also included resolution of racemic mixtures to provide the optically active isomers of the foregoing compounds is carried out for example by forming a salt with an optically active acid many of which are known to those skilled in the art such as optically active tartaric mandelic cholic o o di p toluoyl tartaric and o o dibenzoyl tartaric acids or other acids conventionally employed for this purpose the claims therefore will be understood to embrace the products in the form of the several racemic mixtures as well as in the form of the optically active isomers where appropriate the therapeutic processes of this invention comprise systemic administration of an effective non toxic amount of a compound of formula i or a pharmaceutically acceptable acid addition salt thereof to a mammal having a disease state resulting from excessive stimulation of the adrenergic u03b2 receptors or to a mammal requiring vasodilation or to.