This session presents the science behind Medication-Assisted Treatment specific to Methadone Maintenance Treatment Programs (MMTP) in Opioid Treatment Programs (OTP). The session also describes a day in the life and the lifecycle of a patient in an OTP. Presenters will also cover innovative ways that they have seen success in patient retention and outcomes. Finally, attendees will be given the opportunity to pose medical questions about MMTP to an Addiction Certified Specialist.