Effect of sulfisoxazole on the pharmacodynamics of furosemide in patients with nephrotic syndrome

J. Gorski, Y. Liu, K. Sundblad, D. C. Brater, R. Agarwal

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Studies have shown that substantial amounts of furosemide (F) bind to urinary protein in animals with nephrotic syndrome (NS) making the diuretic inactive. In these models, displacement of F from binding sites by sulfisoxazole (S) restores F's diuretic effectiveness. The current study was designed to determine if this occurs in humans and if so whether using S in patients with NS might be a helpful therapeutic strategy. Seven (4 males, 3 females) patient volunteers with NS between the ages of 20-60yrs participated in a randomized, placebo-controlled, crossover study investigating the effect of S on F pharmacodynamics. After achieving sodium (Na+) balance volunteers received S (2 grams Q8H × 3 doses) or placebo orally followed by an IV infusion of F (120 mg over 30min). Serum and urine samples were obtained and F, S, Na+ and potassium (K+) concentrations were determined by HPLC or flame-photometry. The results of the study are given in the Table. In conclusion, unlike the effects of S on F in animal models with NS, S does not increase the efficacy of F in patients with NS. Total Na+ Total K+ Total F Weight Excretion Excretion Excretion N (Kg) (mmol) (mmol) (mg) F alone 7 99±21 239±90 31±5 50±15 F+S 7 99±21 231±125 31±10 50±15.

Original languageEnglish (US)
Number of pages1
JournalClinical Pharmacology and Therapeutics
Volume65
Issue number2
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)

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