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  • Title: The pharmacodynamics of intravenous and oral torsemide in patients with chronic renal insufficiency.
    Author: Rudy DW, Gehr TW, Matzke GR, Kramer WG, Sica DA, Brater DC.
    Journal: Clin Pharmacol Ther; 1994 Jul; 56(1):39-47. PubMed ID: 8033493.
    Abstract:
    The pharmacodynamics of intravenous and oral torsemide were determined in two randomized cross-over clinical trials in patients with chronic renal insufficiency. There was no significant difference in the rate or magnitude of the diuretic response between oral and intravenous administration. As has been shown with other loop diuretics, patients with chronic renal insufficiency have a reduced diuretic response compared with healthy subjects. This diuretic resistance is primarily related to a diminished delivery of drug to the urinary site of action. The response of torsemide at the tubular level is not different from that seen in subjects with normal renal function. Metabolites of torsemide do not appear to contribute to the diuretic response. A dose of 50 to 100 mg dependent on renal function is required to obtain a maximal response. A ceiling dose of approximately 100 mg in patients with chronic renal insufficiency is therefore recommended.
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