ACR Contrast Reaction Card
http://radiology.world/wp-content/uploads/2019/06/Contrast-Reaction-Card.pdf
Pre-Medication for IV Contrast
50 mg prednisone oral (3 doses) at 13 hours, 7 hours, and 1 hour prior to CT examination. (You must have a prescription from your doctor prednisone.)
50 mg benadryl (diphenhydramine) oral - 1 hour prior to the CT examination. (You do not need a prescription for benadryl - it can be purchased at any pharmacy.)