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Related Experiment Videos

Risperidone half-life in a patient taking paroxetine -- a case report.

J Barnhill, M T Susce, F J Diaz

    Pharmacopsychiatry
    |September 29, 2005
    PubMed
    Summary

    Paroxetine inhibits risperidone metabolism, as shown by decreased drug levels after discontinuation. This case highlights potential drug interactions affecting antipsychotic treatment efficacy and safety.

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    Area of Science:

    • Pharmacology
    • Clinical Pharmacy

    Background:

    • Risperidone is an antipsychotic medication metabolized in the liver.
    • Paroxetine is a selective serotonin reuptake inhibitor (SSRI) known to inhibit certain cytochrome P450 enzymes.
    • Drug-drug interactions can alter the metabolism and efficacy of antipsychotics.

    Observation:

    • A patient experiencing side effects discontinued risperidone.
    • Blood levels of risperidone and its active metabolite 9-hydroxyrisperidone were monitored.
    • Significant decreases in risperidone and 9-hydroxyrisperidone levels were observed post-discontinuation.

    Findings:

    • The estimated half-lives of risperidone, 9-hydroxyrisperidone, and the total moiety were calculated.
    • The pharmacokinetic data suggest a significant drug interaction, likely due to paroxetine's inhibitory effect on risperidone metabolism.

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  • Baseline risperidone levels were 33 ng/ml, decreasing to 4 ng/ml after discontinuation.

    • Implications:

    • Clinicians should consider potential interactions between paroxetine and risperidone.
    • Monitoring drug levels may be necessary in patients taking both medications.
    • Understanding these interactions is crucial for optimizing antipsychotic therapy and minimizing adverse events.