Soterenol [(+)-1-(3-methanesulphonamido, 4-hydroxyphenyl)-2-isopropylaminoethanol, MJ 1992] is a directly acting sympathomimetic amine which has been shown to display Beta2-adrenoceptor selectivity. Soterenol, a methanesulfonamido-phenethanolamine related structurally to isoproterenol, was a highly effective bronchodilator agent in several animal species by various routes of administration. The bronchodilator potency of soterenol was equivalent to, or greater than, that of isoproterenol. Soterenol also had potent stimulant action on the alpha-receptor of the smooth muscle.