title: Failure of alkaline diuresis to enhance diflunisal elimination.
abstract: 1 The effects of alkaline diuresis on the elimination of a single oral dose of 750 mg diflunisal were studied in six healthy male volunteers. 2 The plasma concentrations and half-life of diflunisal were not reduced by alkaline diuresis. 3 The 72 h urinary recovery of unchanged diflunisal was more than doubled with alkaline diuresis, but even so, only 5-7% of the administered dose was excreted unchanged. 4 With alkaline diuresis there was a significant increase in the mean renal clearance of diflunisal from 0.27 to 0.46 ml/min, but there was no significant correlation between the renal clearance of diflunisal and urine flow or pH. 5 However, there was a significant increase in the overall mean renal clearance of diflunisal from 0.22 ml/min over the period 0-24 h to 0.73 ml/min from 48-72 h. 6 Forced alkaline diuresis is unlikely to be of value in diflunisal poisoning.
mesh_terms: D000328:Adult; D001639:Bicarbonates / Q000494:pharmacology*; D004061:Diflunisal / Q000097:blood / Q000378:metabolism* / Q000652:urine; D004231:Diuresis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008657:Metabolic Clearance Rate; D012459:Salicylates / Q000378:metabolism*
chemical_list: D001639:Bicarbonates; D012459:Salicylates; D004061:Diflunisal