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Potassium metabolism was studied in a multicentre trial of 174 out-patients with arterial hypertension of mild or moderate degree who were receiving both beta-adenergic blockers and a diuretic (1 tablet Viskaldix, containing 10 mg pindolol and 5 mg clopamide). The antihypertensive effect, heart rate and drug tolerance were also analysed. During the 15-week treatment there were no significant changes in potassium metabolism. Systolic and diastolic blood pressure, both on standing and lying, were significantly decreased, while heart rate remained within normal limits. In no instance was it necessary to discontinue the drug because it was not well tolerated.