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Absorption of Sodium γ-hydroxybutyrate and its Prodrug γ-butyrolactone: Relationship Between in vitro Transport and in Vivo Absorption

1980; Elsevier BV; Volume: 69; Issue: 3 Linguagem: Inglês

10.1002/jps.2600690331

1520-6017

Charles Arena, Ho‐Leung Fung,

Pharmacology and Obesity Treatment

A qualitative relationship between in vitro transport and in vivo absorption of sodium gamma-hydroxybutyrate and gamma-butyrolactone was demonstrated. As with other short-chain acids, sodium gamma-hydroxybutyrate showed capacity-limited transport in vitro, consistent with the previous observation that this drug exhibited slower in vivo absorption with increasing dose. The prodrug lactone, on the other hand, showed a higher intestinal flux than the acid in the everted gut, and in vivo absorption also was more rapid. Capacity-limited transport and absorption of the lactone appeared less evident. Thus, the increased oral hypnotic activity of the lactone over that of the acid most likely is a result of its more favorable intestinal transport characteristics.