<Tr> <Th> Formula </Th> <Td> BaSO4 </Td> </Tr> <Tr> <Th> Molar mass </Th> <Td> 233.3896 </Td> </Tr> <P> Barium sulfate suspension, often simply called barium, is a contrast agent used during X-rays . Specifically it is used to improve visualization of the gastrointestinal tract (esophagus, stomach, intestines) on plain X-ray or computed tomography . It is taken by mouth or used rectally . </P> <P> Side effects include constipation, diarrhea, appendicitis, and if inhaled inflammation of the lungs . It is not recommended in people with intestinal perforation or bowel obstruction . Allergic reactions are rare . The use of barium during pregnancy is safe for the baby; however, X-rays may result in harm . Barium sulfate suspension is typically made by mixing barium sulfate powder with water . It is a non-iodinated contrast media . </P>

What does barium do in a ct scan