Psychological distress and quality of life among Opioid Agonist Treatment service users with a history of injecting and non-injecting drug use: A cross-sectional study in Kathmandu, Nepal.

Those who had history of injecting were younger, had frequent quit attempts, higher medical comorbidity, lower socioeconomic status and remained longer in OAT services. Alongside OAT, the complex and entangled needs of service users, especially those with a history of injecting drugs, need to be addressed to improve quality of life and lessen psychological distress.