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Course of weight change during naltrexone versus methadone maintenance for opioid-dependent patients

David J. Mysels, MD, MBA, Suzanne K. Vosburg, PhD, Ileana Benga, MD, Frances R. Levin, MD, Maria A. Sullivan, MD, PhD

Abstract


Background: μ-Opiate receptor agonism has been associated with weight gain, whereas μ-antagonists have been associated with weight neutrality, or even weight loss.
Aim: This study examined the course of weight changes in opiate-dependent patients over the first 6 months of treatment in methadone (agonist) versus naltrexone (antagonist) maintenance.
Design: A retrospective chart review was conducted on 36 opiate-dependent patients maintained on methadone (n = 16) or naltrexone (n = 20). Outcome measures and analyses: The primary outcome measure was change in body weight from baseline to 3 months and 6 months into treatment. Analysis of variance was used to compare mean weights between the methadone- and naltrexone-maintained patients. Secondarily, mean percent weight changes from baseline to 3 months and from baseline to 6 months into treatment were compared using Student’s t-test.
Results: There was no difference between weight at baseline, 3 months, or 6 months into treatment between the two treatment groups. Furthermore, there was also no difference between the two groups regarding percent weight change from baseline to 3 months or baseline to 6 months. At 3 months, n = 16 methadone patients had a mean weight increase of 1.86 percent (standard deviation [SD] = 7.22 percent) when compared with n = 20 Behavioral Naltrexone Therapy (BNT) patients with an increase of 4.63 percent (SD = 6.49 percent). At 6 months, n = 16 methadone patients had a mean weight increase relative to baseline of 3.67 percent (SD = 9.52 percent) when compared with n = 20 BNT patients, who demonstrated a mean increase of 6.69 percent (SD = 7.56 percent). No association was found between baseline weight, defined as “low” or “high” relative to group medians, and percent gain within and between treatment groups.
Conclusions: This study did not detect a statistically different course of weight gain between methadone and naltrexone maintenance treatment for opiate-dependent patients.


Keywords


methadone, naltrexone, weight gain, opiate dependence

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References


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DOI: https://doi.org/10.5055/jom.2011.0048

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