Constipation is a very common side effect of this medicine because of the way it works. Normally, bile acids in the intestine help control how much water is in your stool which in turn regulates your bowel movement. By binding to bile acid, this medication may remove some water in your stool, causing constipation. To get relief from constipation, increase your water intake and include fiber-rich food like green vegetables, fruits, cereals in your diet.