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Plasma methadone measurements and their role in methadone detoxification programs
K Wolff1, A W Hay, D Raistrick
1Department of Chemical Pathology & Immunology, Old Medical School, University of Leeds, U.K.
Clinical Chemistry
|March 1, 1992
Summary
Low plasma methadone levels during detoxification correlate with withdrawal symptoms and relapse. Monitoring methadone concentrations may improve treatment outcomes for opioid addiction.
Area of Science:
- Addiction Medicine
- Pharmacology
- Clinical Toxicology
Background:
- Opioid addiction is a major public health concern.
- Methadone maintenance therapy is a common treatment for opioid use disorder.
- Detoxification from methadone can be challenging, with high rates of relapse.
Purpose of the Study:
- To investigate the relationship between plasma methadone concentrations and treatment outcomes during detoxification.
- To determine if plasma methadone levels can predict withdrawal symptoms, relapse, and illicit drug re-abuse.
- To assess the feasibility of using plasma methadone monitoring in clinical detoxification programs.
Main Methods:
- Prospective monitoring of eight patients undergoing methadone detoxification.
- Measurement of plasma methadone concentrations at regular intervals.
- Assessment of withdrawal symptoms, relapse, and illicit drug use throughout the study period.
Main Results:
- Patients with plasma methadone concentrations below 0.05 mg/L experienced withdrawal symptoms, relapse, and illicit drug re-abuse.
- None of the eight patients completed the detoxification program successfully.
- Four patients illicitly obtained and took additional methadone during treatment.
- Two patients returned to formal methadone programs, and four relapsed to illicit drug misuse.
Conclusions:
- Plasma methadone concentrations are a critical indicator of treatment success during detoxification.
- Low methadone levels are associated with adverse outcomes, including withdrawal and relapse.
- Plasma monitoring could aid clinicians in adjusting methadone doses and preventing relapse during detoxification.