Prenalterol, sold under the brand name Hyprenan, is a sympathomimetic agent and cardiac stimulant which acts as a β1-adrenergic receptor partial agonist and is used in the treatment of heart failure. It has selectivity for the β1-adrenergic receptor. Its partial agonist activity or intrinsic sympathomimetic activity is about 60%. It is said to have much greater impact on myocardial contractility than on heart rate. The drug has been marketed in Denmark, Norway, and Sweden.
{{Drugbox | Verifiedfields = changed | verifiedrevid = 464213907 | IUPAC_name = 4-{[(2S)-2-hydroxy-3-(isopropylamino)propyl]oxy}phenol | image = Prenalterol.svg | image_class = skin-invert-image | width = 250px
| tradename = Hyprenan | pregnancy_category = | legal_status = Rx-only | routes_of_administration = Oral, IV
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