Effect of carbamazepine on the single oral dose pharmacokinetics of alprazolam

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
H FurukoriK Sugawara

Abstract

The effect of carbamazepine, an inducer of cytochrome P450 (CYP) 3A4, on the single oral dose pharmacokinetics of alprazolam was examined in a double-blind, randomized crossover study with two phases. Seven healthy male subjects took carbamazepine 300 mg/day or matched placebo orally for 10 days, and on the 8th day they took a single oral 0.8 mg dose of alprazolam. Blood samples were taken and psychomotor function was assessed by the Digit Symbol Substitution Test, Visual Analog Scale, and UKU Side Effect Rating Scale up to 48 h after alprazolam dosing. Carbamazepine significantly (p < .01 to .001) decreased the plasma alprazolam concentrations during the elimination phase. Carbamazepine significantly (p < .001) increased the apparent oral clearance (0.90 +/- 0.21 vs. 2.13 +/- 0.54 ml/min/kg) and shortened the elimination half-life (17.1 +/- 4.9 vs. 7.7 +/- 1.7 h), with no significant effect on the peak plasma concentration (11.7 +/- 1.5 vs. 13.0 +/- 3.5 ng/ml). The majority of psychomotor function parameters during the carbamazepine treatment were not significantly different from those during the placebo treatment, probably because of the sedative effect of carbamazepine itself. The present study suggests that carbamazepine de...Continue Reading

Citations

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