[Effect of the beta-adrenergic blocking agent bupranolol on the plasma renin activity in normotensive rats]

The effects of the beta-adrenergic blocking agent 3-tert.-butyl-amino-1-(6'-chloro-3'-methylphenoxy)-propan-2-ol hydrochloride (bupranolol; KL 255; Betadrenol) on the plasma renin activity (PRA) of normotensive rats were studied in comparison to propranolol. Bupranolol (10--100 microgram/kg) reduced basal PRA and inhibited the isoproterenol as well as dihydralazine induced increase of PRA in a dose dependent fashion. Bupranolol exhibited an effect 2--4 times stronger than that of propranolol. The PRA inhibiting effects of bupranolol seem to be linked to its beta-receptor blocking properties.