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Related Experiment Videos

Decreased methadone effect after ritonavir initiation.

S M Geletko1, A D Erickson

  • 1University of Rhode Island College of Pharmacy, Department of Pharmacy Practice, Veterans Affairs Medical Center, Providence 02908, USA.

Pharmacotherapy
|January 21, 2000
PubMed
Summary

Ritonavir, a protease inhibitor for HIV, can lower methadone levels, potentially causing withdrawal symptoms in patients undergoing treatment. This highlights significant drug-drug interactions to monitor in co-infected individuals.

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Area of Science:

  • Pharmacology
  • Virology
  • Drug Metabolism

Background:

  • Combination antiretroviral therapy (cART) has improved human immunodeficiency virus (HIV) management.
  • Protease inhibitors (PIs) are key components of cART, offering increased potency.
  • Significant drug-drug interactions are a concern with potent antiretroviral agents.

Observation:

  • Methadone, an opioid agonist therapy, is metabolized by cytochrome P450 3A4 (CYP3A4).
  • Ritonavir is a potent inhibitor and inducer of CYP enzymes, including CYP3A4.
  • An HIV-positive patient on methadone maintenance therapy (MMT) experienced withdrawal symptoms.

Findings:

  • The addition of ritonavir to the patient's cART regimen coincided with the onset of withdrawal symptoms.
  • Ritonavir's known effect as a CYP3A4 inducer can decrease methadone plasma levels.

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  • Ritonavir was identified as the most probable cause of reduced methadone efficacy.

    • Implications:

    • Clinicians must be aware of ritonavir's potential to reduce methadone levels in co-treated patients.
    • Monitoring for opioid withdrawal symptoms is crucial in HIV patients receiving both MMT and ritonavir-containing cART.
    • Careful management of drug-drug interactions is essential for optimizing treatment outcomes in coinfection scenarios.