Abstract
The absorption of sodium valproate was studied in 5 rabbits. Each animal received the drug (70 mg/kg) via 3 routes: intravenous, gastric and duodenal. For the 2 extravascular routes, the absolute bioavailability F, maximal plasma concentrations Cmax, times to peak Tmax and absorption coefficients Kabs were the same. Absolute bioavailability was always close to unity. This indicated that valproic acid was absorbed from the intestine as well as from the whole gastrointestinal tract. The other pharmacokinetic parameters such as terminal plasma half-life, total clearance and volume of distribution remained unchanged whatever the route of administration.
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