Clinical Pharmacogenetics Implementation Consortium Guideline for CYP2B6 Genotype and Methadone Therapy CLINICAL PHARMACOLOGY & THERAPEUTICS | VOLUME 0 NUMBER 0 | Month 20241Clinical Pharmacogenetics Implementation Consortium Guideline for CYP2B6 Genotype and Methadone TherapyKatherine M. Robinson1, Seenae Eum2, Zeruesenay Desta3, Rachel F. Tyndale4, Andrea Gaedigk5,6, Richard C. Crist7, Cyrine E. Haidar8, Alan L. Myers9, Caroline F. Samer10, Andrew A. Somogyi11, Pablo Zubiaur12, Otito F. Iwuchukwu13, Michelle Whirl- Carrillo14, Teri E. Klein14, Kelly E. Caudle8, Roseann S. Donnelly8,15 and Evan D. Kharasch16,*Methadone is a mu (μ) opioid receptor agonist used clinically in adults and children to manage opioid use disorder, neonatal abstinence syndrome, and acute and chronic pain