Terbinafine and risperidone drug interaction contributing to clinical changes in a forensic psychiatric patient

Risperidone is a second generation "atypical" antipsychotic that exhibits its clinical effects through a combined effort of risperidone and its active metabolite, 9-hydroxyrisperidone (9-OHR), otherwise known as paliperidone. Risperidone is hepatically metabolized by the cytochrome P450 2D...

Full description

Saved in:
Bibliographic Details
Published in:The mental health clinician 2023-06, Vol.13 (3), p.159-162
Main Authors: Reynolds, Jamie, Gramlich, Nicole
Format: Article
Language:English
Subjects:
Case Reports
cyp2d6 inhibitor
drug interactions
risperidone
terbinafine
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Risperidone is a second generation "atypical" antipsychotic that exhibits its clinical effects through a combined effort of risperidone and its active metabolite, 9-hydroxyrisperidone (9-OHR), otherwise known as paliperidone. Risperidone is hepatically metabolized by the cytochrome P450 2D6 (CYP2D6) enzyme into 9-OHR. Significant interference with the metabolism of risperidone may lead to clinical consequences for patients via alterations in the ratio of the parent compound and active metabolite. This patient case reports 1 example of how a drug interaction could contribute to delayed response to a medication increase after psychiatric decompensation. A forensic psychiatric patient was transitioned from oral risperidone to risperidone microspheres long-acting injectable and had worsening of symptoms, necessitating an increased dose of the injection. This increase in symptoms may have been prolonged by addition of a CYP2D6 inhibitor, terbinafine. The changes in clinical symptoms correlate with medication concentrations that were drawn before terbinafine was started, during terbinafine therapy, and after terbinafine was discontinued.
ISSN:2168-9709
2168-9709
DOI:10.9740/mhc.2023.06.159