World Health Organization2025-10-052025-10-052025-10-05https://iris.who.int/handle/10665/383055vi, 14 p.enCC BY-NC-SA 3.0 IGOhttps://creativecommons.org/licenses/by-nc-sa/3.0/igoOpioid-Related DisordersSubstance-Related DisordersSubstance Abuse Treatment CentersAnalgesics, OpioidDrug OverdoseMethadoneBuprenorphineNaltrexoneContinuity of Patient CarePsychosocial Support SystemsEmergenciesHealth ServicesResilience, PsychologicalGuidelineOpioid agonist maintenance treatment as an essential health service: implementation guidance on mitigating disruption of services for treatment of opioid dependenceTechnical Documentsprevention and controldrug therapymethodsWorld Health Organization10.2471/B09543