Inclusion Criteria:  age 18 and older American Society of Anesthesia health class I-III Currently taking buprenorphine formulation equivalent to 8mg or greater for at least 30 days for treatment of Opioid Use Disorder Scheduled for surgery at Maine Medical Center for a procedure with a greater than 4/10 pain intensity is expected on post-op day one.  Exclusion Criteria:  unable to consent to the study currently pregnant current major medical illness that could limit the ability to utilize medications within our protocol driven multimodal analgesic plan (e.g. cancer, severe end-stage organ disease, or dementia)