Lack of effect of amitriptyline on risperidone pharmacokinetics in schizophrenic patients.

Abstract:

:The interaction between plasma concentrations of the tricyclic antidepressant amitriptyline and the metabolism of the new antipsychotic risperidone was studied in 12 patients with chronic schizophrenia. Each patient received 3 mg risperidone twice a day for 28 days. Amitriptyline was coadministered at doses of 50 mg/day on day 15 and 100 mg/day on days 16 to 21. Amitriptyline did not significantly affect the mean plasma concentrations or pharmacokinetics of risperidone in schizophrenic patients or influence the antipsychotic fraction (the total concentration of risperidone and 9-hydroxyrisperidone, its primary and biologically active metabolite). These results suggest that risperidone dose need not be adjusted when coadministered with amitriptyline at doses up to 100 mg/day in schizophrenic patients.

authors

Sommers DK,Snyman JR,van Wyk M,Blom MW,Huang ML,Levron JC

doi

10.1097/00004850-199705000-00004

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

141-5

issue

3

eissn

0268-1315

issn

1473-5857

journal_volume

12

pub_type

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