Schuster O, Loew D, Knoell HE. Bioavailability and elimination kinetics of the combination furosemide-retard/triamterene.
Eur J Drug Metab Pharmacokinet 1985;
10:127-32. [PMID:
4043142 DOI:
10.1007/bf03189706]
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Abstract
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 the non-retarded form of furosemide was distinctly reduced by the retardation in the substances investigated. It varied between 42-66% in the plasma and 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 and 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 furosemide-retard/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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