10 years ago I had the Roux-en Y Gastric Bypass surgery, which gave me malabsorption syndrome. That means that food, vitamins, minerals, meds, ect...do NOT digest in my "pouch", they digest in the lower intestine or go through my liver. So all meds had to be adjusted. I have had the same doctor for 3 years, she put me on Fentanyl 25 every 72 hours and 4 norco 5/325 for break through pain.