Medication cost is significantly reduced after Roux-en-Y gastric bypass in obese patients.

Background: This study aims to determine the influence of Roux-en-Y gastric bypass (RYGB) on medication-related costs.

Methods: The study analyzed the types, dosages, and costs of drugs and medical devices prescribed before and after surgery (1, 3, 6, and 12 months and yearly thereafter) in patients who underwent RYGB between June 2004 and May 2010 and had an outpatient visit between December 2009 and May 2010 at Pitié-Salpêtrière University Hospital, Paris, France.

Results: The cohort included 143 patients (78 % female; mean age, 42.