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The saluretic and diuretic properties of 4-chloro-5-sulfamoyl-2',6'-salicyloxylidide (xipamide) and 2,4,7-triamino-6-phenyl-pteridine (triamterene) were determined in rats following sole and combined application in various dosages and dose ratios. Xipamide dosages ranged from 0.01-30 mg/kg body weight. Xipamide, when given alone, revealed a significant dose-dependent increase in sodium excretion and urine volume compared to control animals even in the smallest dose to be tested (0.01 mg/kg). Triamterene as sole agent led to an increased sodium and water excretion when given in a natriuretic threshold dose of approximately 1.0 mg/kg. Potassium excretion was slightly enhanced following xipamide application and decreased significantly with triamterene treatment. The combined application of xipamide and triamterene in dose ratios of 1:1-1:4 (xipamide/triamterene) resulted in an increased sodium excretion which was almost additive following high triamterene dosages. Potassium elimination decreased significantly when threshold triamterene dosages were added. High triamterene dosages in all dose ratios of the combined application resulted in potassium levels which only could be registered following sole triamterene application.
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