In most cases an MRI exam does not require any injections. In some situations, however, a substance known as a contrast agent may be needed to enhance the ability of the MRI to see into your body. All contrast agents are FDA-approved and are considered safe.
Very anxious patients and small children may be given a sedative to help them relax and lie still during the exam. If you think you will require a sedative, you will need to bring someone to drive you home.