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Articles

Intestinal absorption of amiodarone in man

A Pfeiffer, N Vidon, M Bovet, M Rongier, and JJ Bernier

The jejunal absorption rate of amiodarone and the influence of lipids on it were studied in human volunteers using the intestinal perfusion technique. A nutrient solution (Realmentyl, Sopharga Laboratories, France) with 300 mg of the drug was infused for 120 minutes at the ligament of Treitz. The segment tested was 25 cm long. Two caloric loads of the nutrient solution, 3.3 Kcal/min (solution A) and 1.3 Kcal/min (solution B), A containing total lipid and caloric load 2.5 times higher than B, were administered. Minor interindividual differences in amiodarone absorption rate were observed (20.2 to 31.7%) with solution A. Amiodarone absorption correlated with lipid absorption significantly. Since the maximal plasma concentrations of the drug and the area under the curve (AUC/24 hours) did not correlate with the amount of amiodarone absorbed, the wide fluctuations of amiodarone pharmacokinetics must mainly be due to amiodarone tissue distribution and metabolic pathway.
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