Effects of acetaminophen and ibuprofen on renal function in the stressed kidney

W. B. Farquhar, A. L. Morgan, E. J. Zambraski, W. L. Kenney

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Abstract

Exercise, salt restriction, and/or dehydration causes transient reductions in renal function that may be buffered by vasodilatory prostaglandins (PGs). Over-the-counter (OTC) analgesics have the potential to alter renal hemodynamics by inhibiting renal PGs. Therefore, we tested the renal effects of the maximal recommended dose of acetaminophen (Acet, 4 g/day) and ibuprofen (Ibu, 1.2 g/day) vs. a placebo (Pl) in humans subjected to progressive renal stresses. After baseline measurements, 12 fit young (25 ± 1 yr) men and women underwent 3 days of a low (10 meq/day)-sodium diet while taking one of the drugs or Pl (crossover design). Day 4 involved dehydration (- 1.6% body wt) followed by 45 min of treadmill exercise (65% maximal O2 uptake) in the heat (36°C). These combined stressors caused dramatic decreases in effective renal plasma flow, glomerular filtration rate (GFR), and sodium excretion. Baseline GFR (range: 118-123 ml/min) decreased to 78 ± 4, 73 ± 5, and 82 ± 5 ml/min postexercise in the Acer, Ibu, and Pl trials, respectively, with a significantly greater decrease in GFR in the Ibu trial (P < 0.05 vs. Pl). OTC Ibu has small but statistically significant effects on GFR during exercise in a sodium- and volume-depleted state; OTC Acet was associated with no such effects.

Original languageEnglish (US)
Pages (from-to)598-604
Number of pages7
JournalJournal of applied physiology
Volume86
Issue number2
DOIs
StatePublished - Feb 1999

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All Science Journal Classification (ASJC) codes

  • Physiology
  • Physiology (medical)

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