The invention relates to phenylethanolamines of general formula ##STR1## wherein R.sub.1 and R.sub.2 are defined as in claim 1, the enantiomers and the acid addition salts thereof, which have valuable pharmacological properties, not only analgesic, antiphlogistic, broncholytic, uterus-spasmolytic, lipolytic effects and an antispastic effect on the cross-striped muscle, but also .beta..sub.2 -mimetic and/or .beta..sub.1 -blocking effects, the use thereof as pharmaceuticals and as performance enhancers and processes for preparing them.