Inclusion criteria:  Pt undergoing open thoracotomy at Indiana University Hospital ASA 1,2,3 or 4 Age 18 or older, male or female  Exclusion criteria:  History of substance abuse in the past 6 months which would include heroin, marijuana or any other illegal street drugs Patient on home dose of gabapentin or pregabalin Patient staying intubated after surgery Patient above 70yo Patient (home dose) taking more than 30mg PO morphine equivalent (PME) per day Known allergy or other contraindications to the study medications, which include gabapentin Patient unable to receive post-op epidural BMI above 40 Creatinine clearance less than 30