No pharmacokinetic but pharmacodynamic interactions between cisapride and bromperidol or haloperidol.

Abstract:

:Pharmacokinetic and pharmacodynamic interactions between the gastrokinetic drug cisapride and the antipsychotic drugs bromperidol and haloperidol were studied in 29 schizophrenic inpatients. Fourteen patients were taking bromperidol (12-24 mg/d), and 15 were taking haloperidol (12-36 mg/d). Cisapride 10 mg/d was coadministered for 1 week, and blood sampling was performed before cisapride treatment, 1 week after starting cisapride treatment, and I week after stopping cisapride treatment. On the same days as the blood sampling, psychotic symptoms and side effects were evaluated using the Brief Psychiatric Rating Scale (BPRS) and the Udvalg for Kliniske Undersøgelser (UKU) side effect rating scale (UKU), respectively. Plasma concentrations of bromperidol, haloperidol, and their reduced metabolites were measured by high-performance liquid chromatography. The mean BPRS scores after adding cisapride were significantly higher than those before cisapride (p<0.01) and after stopping cisapride (p<0.001) in the haloperidol group in this uncontrolled study. A similar tendency was observed in the bromperidol group, although it did not reach statistical significance (p = 0.08). Cisapride coadministration caused no significant changes in the mean plasma concentrations of bromperidol, haloperidol, and their reduced metabolites or in the mean UKU score. The present study suggests that there is no significant pharmacokinetic interaction between cisapride and bromperidol or haloperidol, but cisapride appears to deteriorate psychotic symptoms by a pharmacodynamic interaction in schizophrenic patients treated with haloperidol.

journal_name

Ther Drug Monit

authors

Mihara K,Otani K,Yasui N,Ishida M,Kondo T,Suzuki A,Furukori H,Nagashima U,Kaneko S,Inoue Y

doi

10.1097/00007691-199906000-00007

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

297-300

issue

3

eissn

0163-4356

issn

1536-3694

journal_volume

21

pub_type

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