title: An assessment of beta-adrenoceptor blockade in man by prizidilol hydrochloride.
abstract: 1 Prizidilol hydrochloride (SK&F 92657) is a new compound which causes both arteriolar dilatation and beta-adrenoceptor blockade. The effect of a single oral dose on the responses of heart rate and blood pressure to isoprenaline infusion has been studied in healthy volunteers. 2 Isoprenaline heart rate dose-response curves showed parallel shifts to the right after oral prizidilol, indicating antagonism by this compound at beta-adrenoceptors in the heart. 3 Isoprenaline dose-response curves for decreases in diastolic blood pressure also showed shifts to the right after oral prizidilol, providing evidence of beta-adrenoceptor antagonism by this drug in peripheral resistance vessels. 4 The peak effect of a 40 mg dose of propranolol was greater than that of a 200 mg dose of prizidilol but both drugs caused persistent beta-adrenoceptor blockade for at least 7 h after ingestion.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D006830:Hydralazine / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D008297:Male; D011433:Propranolol / Q000494:pharmacology; D011724:Pyridazines / Q000494:pharmacology*; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D000319:Adrenergic beta-Antagonists; D011724:Pyridazines; D014665:Vasodilator Agents; D006830:Hydralazine; D011433:Propranolol; C024293:prizidilol; D007545:Isoproterenol