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Attenuation of furosemide's diuretic effect by indomethacin: Pharmacokinetic evaluation

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Abstract

The pharmacokinetics and pharmacodynamics of intravenous furosemide, 40 mg, were studied in four normal males in a crossover fashion with and without indomethacin pretreatment. In each study 16 plasma and 10 urine samples were collected over 24 hr. Fluid and electrolyte urinary losses were replaced orally throughout the study. Unchanged furosemide and indomethacin were measured using HPLC; urinary sodium was measured by flame photometry. Pretreatment with indomethacin resulted in increased and prolonged furosemide plasma levels, increased area under the curve, decreased plasma clearance, decreased renal clearance, increased half-life, no change in volume of distribution, and decreased sodium excretion and urine volume. Analysis of sodium excretion rate with time shows that the inhibiting effect of indomethacin was greater during the first 2 hr than at later times.

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This work was supported in part by National Institutes of Health Grants GM 16496 and AM 20884. During a portion of this work, Mr. Smith received support as a National Institutes of Health predoctoral fellow through Training Grant GM 07175.

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Smith, D.E., Brater, D.C., Lin, E.T. et al. Attenuation of furosemide's diuretic effect by indomethacin: Pharmacokinetic evaluation. Journal of Pharmacokinetics and Biopharmaceutics 7, 265–274 (1979). https://doi.org/10.1007/BF01060017

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