The medication routinely injected during an MRI is a gadolinium agent, usually gadopentetate dextran, abbreviated as Gd-DTPA. The reason why gadopentetate dextran is injected at the time of the MRI is because it is necessary to inject a specialized contrast agent from the patient’s peripheral veins during the MRI enhancement scanning examination. Its pharmacological effect is to be used to enhance the image representation of the whole body flowing through the body, and it is able to effectively enhance the contrast and clarity of the captured image, thus increasing the credibility of the examination. The drugs injected for MRI are not therapeutic drugs, but merely contrast agents used in imaging, but they are able to clearly characterize and differentiate the scope, size, and structure of the examined area, thus making the results more accurate.