1 Effective renal plasma flow (ERPF) and glomerular filtration rate (GFR) were measured in two groups of 12 patients both at rest and during sub-maximal cycloergometer exercise while on placebo and after 3 months of treatment with either labetalol or propranolol. 2 ERPF increased and renal vascular resistance decreased both at rest and during exercise after labetalol treatment, compared with placebo; the opposite was observed after propranolol treatment.3 GFR increased after labetalol and decreased after propranolol both at rest and during exercise, compared with placebo, but these changes were not statistically significant. 4 Labetalol and propranolol resulted in the same decrease in blood pressure and a comparable incidence of side effects.

The metabolic effects of Enalapril (EN) were compared in a cross over study with those of Propranolol (PPL). Long term treatment with the ACEI did not modify the lipid and glucose profile and increased urate excretion, while PPL increased triglycerides and decreased urate clearance.

Effective renal plasma flow and glomerular filtration rate were measured in 22 mild-tomoderate, uncomplicated, essential hypertensive patients during placebo and after 3 months of randomly assigned treatment either with prizidilol (n = 10) or propranolol (n = 12). Measurements were performed at rest and during cycloergometer exercise. 2 For a comparable effect on blood pressure effective renal plasma flow was significantly increased at rest by prizidilol (+9%) and decreased by propranolol (-13.6%); these patterns were maintained during exercise. Glomerular filtration rate was immodified after the treatment with both drugs. 3 It is concluded that prizidilol is an effective hypotensive agent with no deleterious effects on renal haemodynamics.

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