['opioid dependence', 'opioid related disorders']
['suboxone', 'rbp-6000', 'placebo']

        Inclusion Criteria:

          -  Currently meets Diagnostic and Statistical Manual of Mental Disorders, 5th Edition
             (DSM-5) criteria for moderate or severe opioid use disorder

          -  By medical history has met DSM-5 criteria for moderate or severe opioid use disorder
             for the 3 months immediately prior to signing the informed consent form

          -  Is seeking medication-assisted treatment for opioid use disorder

          -  Is an appropriate candidate for opioid partial-agonist medication-assisted treatment
             in the opinion of the investigator or medically responsible physician

          -  Body mass index (BMI) of ≥ 18.0 to ≤ 35.0 kg/m^2

        Exclusion Criteria:

          -  Current diagnosis other than opioid use disorder requiring chronic opioid treatment

          -  Current substance use disorder as defined by DSM-5 criteria with regard to any
             substances other than opioids, cocaine, cannabis, tobacco, or alcohol.

          -  Positive urine drug screen (UDS) result at screening for cocaine or cannabis AND meets
             DSM-5 criteria for either moderate or severe cocaine or cannabis use disorder,
             respectively

          -  Meets DSM-5 criteria for moderate or severe alcohol use disorder

          -  Received medication-assisted treatment for opioid use disorder (e.g., methadone,
             buprenorphine) in the 90 days prior to providing written informed consent
      