, Regarding medications for multiple sclerosis, this would be a great question for your doctor. I conducted a very quick search and found a short list of medications that could be harmful to the kidneys: https://www.kidney.org/atoz/content/drugs-your-kidneys . Besides things like pain medications, alcohol, antibiotics, and other therapies, I noticed that contrast agents (like gadolinium which is used for MRI scans to show active lesions) is on the list. This is one reason that the MRI facility might request recent laboratory/blood test results prior to MRIs to make sure that your kidney function is not impaired. Best wishes, Lisa, MS Team Member