In vitro and in vivo evaluation of the inhibition potential of risperidone toward clozapine biotransformation.

Abstract:

AIMS:To study the impact of risperidone (RISP) on clozapine (CLZ) biotransformation in vitro in microsomal fractions containing varying expression of CYP oxidases and in vivo in patients. METHODS:Human liver microsomes (n= 11) were assessed for expression of CYPs 1A2, 2D6 and 3A4, because these enzymes mediate RISP and CLZ oxidation. Inhibition of CLZ oxidation by RISP was assessed. Plasma CLZ elimination was estimated in patients with schizophrenia who received either CLZ alone or the CLZ-RISP combination (n= 10 per group). RESULTS:(i) The CYP3A4 and CYP1A2 inhibitors ketoconazole and fluvoxamine inhibited CLZ oxidation to varying extents in individual microsomal fractions. (ii) RISP did not inhibit CLZ oxidation, regardless of variations in CYP expression. (iii) RISP co-administration did not impair CLZ clearance. CONCLUSIONS:No evidence was found for CYP-mediated inhibitory or pharmacokinetic interactions between RISP and CLZ. Occasional literature reports of such interactions may involve other pathways that participate in CLZ disposition.

journal_name

Br J Clin Pharmacol

authors

Chetty M,d'Esposito F,Zhang WV,Glen J,Dore G,Stankovic Z,Edwards RJ,Ramzan I,Murray M

doi

10.1111/j.1365-2125.2009.03476.x

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

574-9

issue

4

eissn

0306-5251

issn

1365-2125

pii

BCP3476

journal_volume

68

pub_type

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