Family-Focused Study to Support Medication for Opioid Use Disorder

Inclusion Criteria: * Be 18 years or older who meet the criteria for moderate or severe opioid use disorder (OUD) as determined by the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). Referred to as the "Identified Patient" or IP. * Be a parent, spouse or committed romantic partner, other family member, or friend, age 21 or older, of the individual with OUD. Referred to as "Concerned Significant Other" or CSO. * Able to communicate fluently in English. * Own a smartphone. Exclusion Criteria: * IP must not have been on MOUD in the last 2 weeks. * CSO must not meet criteria for any severity of substance use disorder (SUD), except tobacco use.