has anyone tried kefir probiotic drink?
Why not? Kefir is a great probiotic, that is very useful in disorders of the gastrointestinal tract, and especially in pancreatitis. So yes, you can drink it!
If you have pancreatitis, this drink acts just like a source of digestible animal protein, which is really needed daily to maintain the normal functioning of the pancreas. Feel free to drink it, but don't drink it that much.
You have to have a measure in this as well. You can also make it at home, there are so many recipes that actually can tell you how to use kefir grains to make kefir at home. Good luck!