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Clinical Trial
. 2007 Apr;29(2):185-9.
doi: 10.1097/FTD.0b013e318038d835.

Dose-dependent Effects of the 3435 C>T Genotype of ABCB1 Gene on the Steady-State Plasma Concentration of Fluvoxamine in Psychiatric Patients

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Clinical Trial

Dose-dependent Effects of the 3435 C>T Genotype of ABCB1 Gene on the Steady-State Plasma Concentration of Fluvoxamine in Psychiatric Patients

Naoki Fukui et al. Ther Drug Monit. .

Abstract

This study investigated effects of the 3435 C>T genotype of the adenosine triphosphate-binding cassette subfamily B member 1 (ABCB1, MDR1) gene on the steady-state plasma concentration of fluvoxamine (FLV).

Methods: Sixty-two psychiatric patients were treated with different doses (50, 100, 150, and 200 mg/d) of FLV. Blood samples were collected after at least 2 weeks of treatment with the same daily dose to obtain steady-state concentrations of FLV, and 3435 C>T genotype was determined by polymerase chain reaction.

Results: FLV concentration-to-dose ratio was significantly different among 3435 C>T genotype groups at the 200 mg/d dose (P = 0.019). A post-hoc analysis revealed that FLV concentration-to-dose ratio was significantly higher in the TT genotype group as compared with the CC genotype group at the 200 mg/d dose (median value of concentration-to-dose ratio (ng/mL)/(mg/d), 0.861 vs 0.434, P = 0.026). FLV concentration-to-dose ratio was significantly higher in the CT + TT genotype group than the CC genotype group at the 200 mg/d dose (median value of concentration-to-dose ratio (ng/mL)/(mg/d), 0.618 vs 0.434, P = 0.031). At 50, 100, and 150 mg/d dose, FLV concentration-to-dose ratios were not significantly different among 3435 C>T genotype groups. At 50, 100, and 150 mg/d dose, no significant differences were found in FLV concentration-to-dose ratios between the CT + TT genotype group and CC genotype group.

Conclusions: This study suggests that pharmacokinetics of FLV depend on ABCB1 gene polymorphism only at the 200 mg/d dose.

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