Abstract
Background
Opioid-induced constipation (OIC) is the most prevalent side effect of methadone maintenance therapy (MMT). Naloxone could reduce the OIC.
Method
Fifty-six MMT cases (< 75 mg/day methadone, > 3 months) were entered randomly into four groups of a trial. They received placebo or naloxone tablets (0.5, 2, or 4 mg/day) once a day for 2 weeks. They continued their conventional laxative. Their constipation and opiate withdrawal (OWS) were evaluated by the Bristol Stool Form Scale (stool consistency and frequency), Patient Assessment of Constipation Symptoms (PAC-SYM) questionnaire, Constipation Scoring System (CSS), and the Subjective Opiate Withdrawal Scale (SOWS) before starting treatment and at the end of the first and second weeks.
Results
The dose of 4 mg/day naloxone was excluded from the study due to severe OWS. The precipitants of groups had similar ages, methadone dose and duration, laxative use, and constipation scores at the start of the trial. However, 2 mg of naloxone could change the stool consistency (PV = 0.0052) and frequency (P = 0.0133), 0.5 mg/day dose only improved the stool consistency (P = 0.0016). The patients’ CSS and PAC-SYM scores were reduced by naloxone after the 1st week of treatment. However, there was no significant difference in the mean score of SOWS at different assessment times and groups. Also, 3 and 4 cases of 0.5 and 2 mg/day groups, respectively, withdrew from the study due to OWS.
Conclusion
Oral naloxone at doses of 0.5 and 2 mg/day was significantly more effective than placebo on OIC in MMT. However, the dose of 4 mg induced intolerable OWS.
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Data availability
The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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Acknowledgements
The data reported in this article are part of a Pharm D. thesis. The researchers especially thank the participants who were included in the study. We also thank the eight addiction treatment centers of Khorasan-Razavi.
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Shaghayegh Akhgarandooz: data curation and writing—original draft; Mohammad Moshiri: conceptualization, methodology, software, formal analysis, and writing—review and editing; Bita Dadpour: writing—review and editing; Majid Khadem-Rezaiyan: writing—review and editing, methodology, and formal analysis; Leila Etemad: conceptualization, methodology, and writing—review and editing; Nasser Vahdati-Mashhadian: writing—review and editing, supervision, funding acquisition, and corresponding. All authors reviewed the results and approved the final version of the manuscript.
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Akhgarandouz, S., Moshiri, M., Etemad, L. et al. Effect of oral naloxone on opioid-induced constipation in methadone maintenance treatment patients, a double-blind, placebo-control, clinical trial. Ir J Med Sci (2024). https://doi.org/10.1007/s11845-024-03652-2
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DOI: https://doi.org/10.1007/s11845-024-03652-2