I have been taking dexilant (dexlansoprazole) for a few years for GERD, heartburn, etc and it does it great job. Recently I have been experiencing constipation and ga?

What is your diet. Make sure you had your colonoscopy check your diet what are you eating. Watch especially sugarless products cause a lot of gas probably not the devil ant but you should talk to your gi or primary to see if you can decrease discontinue it.