Gastrografin Injection, whose generic name is Metoclopramide Hydrochloride Injection, is an antiemetic medication that can treat vomiting caused by chemotherapy, acute gastroenteritis, and other illnesses, and can be used for barium gastrointestinal exams, but is not effective for vomiting caused by motion sickness. The drug is usually used for vomiting caused by chemotherapy, radiation therapy, surgery, craniocerebral injury, and medications. It is also used to treat vomiting and nausea caused by acute gastroenteritis, biliary pancreas, and uremia. The drug is used before diagnostic duodenal intubation to facilitate smooth intubation. It is used for gastrointestinal barium X-rays to relieve nausea and vomiting reactions and facilitate the passage of barium. Adverse reactions that may occur with the use of this medication include lethargy, restlessness, malaise, constipation, rash, and upright hypotension. It is contraindicated in people who are allergic to procaine or procainamide. Use with caution in hepatic failure and loss of the body’s ability to bind to protein. Pregnant women should not use it, and children should not use it for a long time. The use of the drug should be under the guidance of a doctor, choose the appropriate dose for the condition.