Aim
MH, opioid use disorder
Considering the high withdrawal rate in methadone maintenance treatment (MMT) programs alongside mental health (MH) problems appearing in patients with opioid use disorder and the lack of prior research on the effect of zinc supplementation on PoR and MH status in patients with opioid use disorder undergoing MMT, the present study aimed at:Investigating the effect of zinc supplementation on PoR in patients with opioid use disorder undergoing MMTInvestigating the effect of zinc supplementation on MH status in patients with opioid use disorder undergoing MMT