Background: I was prescribed Creon, not in relation to DS, but in relation to a distal pancreatectomy / liver resection post-DS due to cancer eight months later. At the time I started Creon, I had achieved my desired weight loss from DS, but the additional loss of much of my pancreas was causing me to lose about a pound a day. The Creon effectively stabilized my weight.
I had my gall bladder removed with the second surgery, which led to the complication of bile salt diarrhea, so I was also prescribed Welchol (which worked well for that issue). I think that Creon *may* have also contributed to the very acidic and painful nature of my bowel movements.
It's a bit hard to isolate the side effects. That said, I was on Creon for about 18 months, if memory serves. During my time on Creon, I had issues with gassiness and diarrhea, especially if I ate any grains. Once I stopped Creon, this abated. I also stopped Welchol and the burn effect was gone.
I still have nutritional issues and may return to Creon if needed, but I wanted to give my pancreatic remnant the challenge. I figured it would never develop new production capabilities (to take over for the missing half) if it didn't need to do. I didn't want to develop a lifelong dependency on Creon if it was possible for my body to recover that capacity.
So, Creon worked very well at keeping weight stable and likely caused some gastrointestinal discomfort.