The MHRA is a UK government body that regulates medicines, medical devices and blood components for transfusion. It was formed in 2003 by merging the Medicines Control Agency and Medical Devices Agency. The MHRA licenses pharmaceutical manufacturers, medicines importers, new drugs and devices, clinical trials, and traditional herbal medicines. Licenses must be renewed every five years by re-evaluating the risk-benefit balance. The MHRA can cancel licenses if products affect public health or manufacturers fail to renew on time. Certain drugs also require permission to export.