The commonly used contrast medium for GI ultrasound is barium sulfate suspension, which basically has no side effects on the human body, but only people who have a bad stomach may experience slight constipation and other uncomfortable symptoms. As the main active ingredient of barium sulfate suspension is barium sulfate, barium sulfate is insoluble in water, that is to say, in the human digestive tract is also insoluble, and will not be absorbed into the body, so the human body basically has no effect, only the people who have a bad stomach may have difficulty in digesting the people with minor constipation and other symptoms. Barium Sulfate Suspension Solution is suitable for single and double contrast examinations of the esophagus, stomach, duodenum, small intestine and colon. Under normal circumstances, Barium Sulfate Suspension can be excreted in the feces within 24 hours. It is recommended that patients drink plenty of water after using Barium Sulfate Suspension to promote the elimination of Barium Sulfate Suspension.