Effect of fluid volume on gastric emptying and intestinal drug absorption. II. dihydrocodeine and thiopental concentration profiles in plasma after oral administration in different fluid volumes to mice.
作者:OSAMI TSUZUKI、KIMIHIKO KOUNO、MICHIKO MATSUMOTO、YASUYOSHI NOGAMI、TOSHITAKA KOGA
DOI:10.1248/cpb.30.1892
日期:——
Dihydrocodeine was orally administered to mice and the effect of fluid volume on intestinal absorption and acute toxicity was investigated. An increase in fluid volume from 5 to 20 ml/kg resulted in a significant increase in maximum plasma dihydrocodeine concentration (Cmax); the time required to reach Cmax (Tmax) was reduced from 15 to 5 min. However, fluid volume had little effect on the area under the plasma dihydrocodeine concentration-time curve (AUC0→90). The acute toxicity of dihydrocodeine in the initial stage after oral administration increased in proportion to the fluid volume. These results indicate that early acceleration of the gastric emptying rate due to the increase of fluid volume increases the rate, but not the extent, of dihydrocodeine absorption, resulting in the enhancement of acute toxicity. As for thiopental, the influence of fluid volume on intestinal absorption was also examined using [35S]-thiopental. The Cmax value increased and Tmax was reduced from 20 to 5 min by increase of the fluid volume. However, the volume did not influence AUC0→60 values.
给小鼠口服双氢可待因,研究了液体容量对肠道吸收和急性毒性的影响。液体容量从 5 毫升/千克增加到 20 毫升/千克后,血浆中双氢可待因的最大浓度(Cmax)显著增加;达到 Cmax 所需的时间(Tmax)从 15 分钟缩短到 5 分钟。然而,输液量对血浆中双氢可待因浓度-时间曲线下面积(AUC0→90)的影响很小。口服后初期,双氢可待因的急性毒性随输液量的增加而增加。这些结果表明,液体容量的增加会加快胃排空速度,从而增加双氢可待因的吸收速度,但不会增加吸收程度,从而导致急性毒性增强。至于硫喷妥类药物,也使用[35S]-硫喷妥类药物研究了液体容量对肠道吸收的影响。液体容量增加后,Cmax 值增加,Tmax 从 20 分钟降至 5 分钟。然而,液体容量并不影响 AUC0→60 值。