A total of 1,117 patients with inadequately controlled hypertension in spite of treatment with a combination of diuretic and β-adrenergic blocker were studied. Treatment was changed to one or two tablets daily of Trasidrex (160 mg oxprenolol hydrochloride in a sustained release formulation and 0.25 mg cyclopenthiazide) with a subsequent improvement, 4 weeks later, in blood pressure control.
Side-effects of treatment were uncommon and treatment was approved by the majority of patients. The majority of doctors participating thought a fixed combination would improve patient compliance with therapy.
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