Most of the medications are not affected by t low doses of radiation emitted by screening machines, even if they're exposed several times in a trip. Certain drugs which include insulin and red blood-cell boosters such as epoetin alfa injection etc require special handling and storage. But according to the FDA's Center for Biologics, any harmful effects from x-rays on these medications would occur only at higher doses If a drug's effectiveness or safety could be affected by x-ray screening, the danger would be indicated on the label or package insert.If you're still concerned, you can call the manufacturer of each of your medications