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  • Title: Comparative clinical trial of bemetizide/triamterene and cyclopenthiazide/potassium chloride combinations in patients with mild to moderate hypertension.
    Author: Wray R, Benton KG, Whitehill D, Wright B, Weener W, Whittington JR.
    Journal: Curr Med Res Opin; 1983; 8(9):665-74. PubMed ID: 6365467.
    Abstract:
    A double-blind trial was carried out to compare the combination of 25 mg bemetizide plus 50 mg triamterene ('Hypertane') and 0.25 mg cyclopenthiazide plus 600 mg potassium chloride ('Navidrex' K) in the treatment of mild to moderate essential hypertension. Two well matched groups of patients were treated for periods of 6 weeks with one or other of the drugs under test. There were 2-week placebo run-in and run-out periods. Blood pressure and laboratory investigations were performed every 2 weeks during the trial period. Both treatments resulted in similar overall statistically significant reductions in blood pressure during the trial. With bemetizide/triamterene, mean lying blood pressure decreased by 11.1/11.2 mmHg and mean standing blood pressure by 15.9/10.3 mmHg; with cyclopenthiazide/potassium chloride the corresponding reductions were 14.9/12.1 mmHg and 9.1/11.7 mmHg. The fact that some of the observed overall reduction seen with both drugs was due to 'placebo effect' is discussed but the clinical importance of overall changes is stressed. There were no significant differences between changes in blood pressure with the two treatments. Biochemical changes were those expected with thiazide diuretics. However, the decrease in potassium and increases in urea and uric acid levels were less with bemetizide/triamterene than with cyclopenthiazide/potassium chloride. Clinical tolerance of both treatments was good.
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