Drug Absorption after Bariatric Surgery. The solubility of a drug, surface area for absorption, and blood flow to the gastrointestinal tract influence oral absorption and bioavailability. Bariatric surgery is currently considered the most effective and durable treatment for morbid obesity, with a lack of efficacy or durability a hallmark of the course of conservative therapies. Several associations have been demonstrated between morbid obesity and psychiatric disease. 1. Marson AG, Al-Kharusi AM, Alwaidh M, Appleton R, Baker GA, et al. (2007) The SANAD study of effectiveness of valproate, lamotrigine, or topiramate for generalised and unclassifiable epilepsy: an unblinded randomised controlled trial. Changes to gastric pH, gastric emptying time, gastrointestinal transit-time or the pre-systemic metabolizing effect of enzymes secreted in the mucosa may all alter the pharmacokinetics of medicines. I have started the process for having bariatric surgery. I intially believed I should have gastric bypass because of the impact it can have on diabetes. But I have been reading lately that similar res. Approximately 113,000 bariatric sur­geries were performed in the United States in 2010; as many as 80% of persons seeking weight loss surgery have a history of a psychiatric disorder. 1,2 Bariatric surgery can be “restrictive” (limiting food intake) or “malabsorptive” (limiting food absorption). Bariatric surgery procedures, including laparoscopic adjustable gastric banding, laparoscopic sleeve gastrectomy, and Roux-en-Y gastric bypass, result in an average weight loss of 50 percent of. Management of Bariatric Surgery Patients: Implications for Pharmacy Practice. Learning Objectives. 1. Review the epidemiology, associated complications, and treatment options related to obesity 2. Understand selection criteria in assessing candidates for bariatric surgery 3. Discuss the risk and benefits of bariatric surgery 4. Outlines the various types of bariatric surgery procedures 5. Bariatric surgery in patients with bipolar disorder: an emerging issue. Mrs. F is a 45-year-old woman with type 1 bipolar disorder who has been a patient in your practice for 8 months.