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Wiessing, Lucas and Akartuna, Deniz and Antoine, Jérôme and Banka-Cullen, Sonam Prakashini and Barbaglia, María Gabriela and Belackova, Vendula and Belbaisi, Saed AS and Bernardini, Claudia and Bitri, Sonila and Blanken, Peter and Carrieri, Patrizia and Čelojević, Saša and Comiskey, Catherine and Dacosta-Sánchez, Daniel and Dale, Laura and Dom, Geert and Fabricius, Venus and Faria, Hugo and Fischer, Gabriele and Fotopoulos, Dimos and Hijazi, Lina and Ičanović, Dario and Ignjatova, Liljana and Inić, Nemanja and Jacobsen, Britta and Jakavicius, Haris and Janíková, Barbara and Javakhishvili, Jana D and Kamendy, Zuzana and Kapitány-Fövény, Máté and Karczewska, Roksana and Kiss, Anna and Krasias, Andreas and Kyprianou, Evi and Lamy, Dominique and Landsmane, Inga and MacLeod, Katy and Marchand, Kirsten and Martinelli, Thomas F and Millar, Tim and et al, . (2026) The OPTIMUS international consensus guidance for monitoring user-reported outcomes of opioid maintenance treatment: a delphi study. International Journal of Mental Health and Addiction , 24 , pp. 1319-1341.