Summary
In a pharmacokinetic study on 18 healthy male volunteers the bioavailability and elimination kinetics of furosemide-retard and the combination furosemide-retard/triamterene were investigated and compared with the non-retarded form and another retard form of furosemide. The relative bioavailability of t h e non-retarded form of furosemide was distinctly reduced by the retardation in the substances investigated. It varied between 42–66% in the plasma a n d between 37–73% in the urine. In the combination with triamterene the serum concentration time curve of furosemide was only slightly modified but the renal excretion of furosemide was more influenced (36% for furosemide-retard a n d 25% for furosemide-retard/triamterene). In comparison, the values for the renal excretion of triamterene and OH-TA sulfate were distinctly greater than those obtained after administration of triamterene alone. A renewed increase of the plasma concentration and renal excretion of furosemide were observed between 9 and 10.5 h after administration of furosemideretard/ triamterene. This observation suggests that a further absorption of furosemide occurs as a consequence of the delayed release from distal parts of the small intestine or from the large intestine.
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Schuster, O., Loew, D. & Knoell, H.E. Bioavailability and elimination kinetics of the combination furosemide-retard/triamterene. European Journal of Drug Metabolism and Pharmacokinetics 10, 127–132 (1985). https://doi.org/10.1007/BF03189706
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DOI: https://doi.org/10.1007/BF03189706