Hi orange.There aren't usually problems with using contrast in MRI.If you are prone to unusual allergies you could mention it to the radiographers who are doing the scan. MRI scannners are noisy.Generally speaking there aren't usually any side effects to having an MRI scan.The contrast is used to get a better image,so they may or may not use it. If you do have
a reaction you could take an antihystamine and/or contact the hospital for advice.They usually discuss health issues with you before you have your scan.All the best.