The patient will be asked to drink significantly less than a quart disseminate over 1 slightly.5 to 2 hours.. CT Scan Preparation If a patient will have a contrast injection, he or she should not have anything to eat or drink for a few hours before the CT scan because the injection could cause stomach upset. To receive the contrast injection, an IV is inserted into the arm just prior to the scan. The contrast enters your body through the IV then. Ahead of most CT scans of the abdomen and pelvis, it is necessary to drink an oral contrast agent which has dilute barium. This contrast agent assists the radiologist identify the gastrointestinal tract , identify abnormalities of these organs, and to individual these structures from other structures within the belly.Common adverse events experienced by children after administration of seasonal and H1N1 vaccines typically include pain, redness and swelling at the injection site and also, in some full cases, irritability, loss of appetite and drowsiness. As with any medical product, unpredicted or rare significant adverse events might occur. FDA is definitely collaborating with the U.S. Division of Human and Health Services, like the Centers for Disease Avoidance and Control, and other government organizations to enhance the capacity for adverse event safety monitoring during and after the 2009 2009 H1N1 vaccination program.