August 2026

Medications to Pause Before an MRI With Contrast

By Your Health Magazine Health Information Team

You have an MRI with contrast tomorrow, and the appointment instructions say to bring a medication list. Does that mean you should stop metformin, blood pressure medicine, pain relievers, or other daily prescriptions? In most cases, no. Most people can take their usual medications before an MRI with gadolinium-based contrast unless the imaging center or prescribing clinician gives different instructions.

The important exceptions usually involve fasting, sedation, medication patches, wearable drug-delivery devices, or medicines that can interfere with MRI images. Because stopping a necessary medication may be more dangerous than taking it, never pause a prescription on your own.

Do Any Medications Need to Be Stopped Before an MRI With Contrast?

There is no universal list of medications to avoid before MRI with contrast. Standard MRI contrast is usually a gadolinium-based contrast agent, which is different from the iodine-containing contrast commonly used for CT scans. Instructions you previously received before a CT scan may not apply to an MRI.

For a routine contrast-enhanced MRI without sedation or an additional procedure, patients are generally told to continue their regular medicines. This often includes:

Blood pressure and heart medications
Seizure medications
Thyroid medications
Antidepressants and other psychiatric medications
Blood thinners
Prescription and over-the-counter pain relievers
Antibiotics
Most vitamins and supplements

An ordinary MRI does not involve an incision, so blood thinners usually do not need to be paused. However, different instructions may apply if the appointment includes a biopsy, anesthesia, an injection into a joint, or another invasive procedure.

Metformin Usually Does Not Need to Be Held

Metformin is frequently mentioned in contrast instructions, leading many people to assume it must be stopped before every contrast-enhanced scan. The concern is mainly associated with certain situations involving iodinated contrast, kidney function, and CT or angiographic procedures.

Metformin generally does not need to be discontinued for an MRI using a standard dose of gadolinium-based contrast. Still, tell the imaging team that you take it, especially if you have acute kidney problems, advanced chronic kidney disease, dehydration, or a recent serious illness.

If your MRI requires fasting, your diabetes treatment plan may need temporary changes to prevent low or high blood sugar. Ask the clinician managing your diabetes how to handle insulin or other glucose-lowering medicines. The answer depends on the length of the fast, appointment time, and your usual treatment—not simply on the presence of MRI contrast.

Medication-Related Situations That Need Special Planning

Ferumoxytol Iron Infusions

Ferumoxytol is an intravenous iron treatment that can change the appearance of MRI studies. Its effects on some MRI sequences may persist for up to three months after the last infusion. If you have recently received ferumoxytol or have an infusion scheduled, tell the radiology department before your appointment.

Do not cancel or delay prescribed iron treatment yourself. The radiologist and prescribing clinician may recommend completing the MRI first, changing the imaging technique, or rescheduling one of the appointments.

Medication Patches

Some transdermal medication patches contain metallic components that may heat during an MRI and cause skin irritation or burns. Examples can include certain scopolamine and other medicated patches, but construction varies by manufacturer and product.

Tell the MRI technologist about every patch you are wearing. Do not assume a patch is safe because it looks like fabric or plastic. The team will check the product and determine whether it should be removed. Ask when and how to replace it so that treatment is not unintentionally interrupted.

Insulin Pumps, Continuous Glucose Monitors, and Infusion Devices

An insulin pump, continuous glucose monitor, implanted drug pump, or external infusion device may be unsafe in the MRI environment or may function incorrectly after exposure to the magnetic field. These devices must be identified and checked before entering the scanner room.

Removing a diabetes device may require a temporary glucose-management plan. Contact the imaging center and the clinician who manages your diabetes in advance rather than disconnecting the device without a safe alternative.

Medicines Used for Anxiety or Sedation

If claustrophobia makes MRI difficult, a clinician may prescribe medicine to help you relax. Take it only according to the instructions provided. Sedatives can cause sleepiness, impaired coordination, slowed reactions, and occasionally breathing problems.

You will generally need a responsible adult to drive you home if you take a sedative. If deeper sedation or anesthesia is planned, the facility may provide separate fasting and medication instructions. Review those directions carefully because they can differ from standard MRI preparation.

Kidney Disease Changes the Screening, Not Necessarily Your Medication List

Gadolinium contrast is cleared mainly through the kidneys. Before giving it, the imaging team may ask about chronic kidney disease, dialysis, kidney transplant, recent kidney injury, diabetes, or high blood pressure. Some patients need a recent blood test to estimate kidney function.

Modern gadolinium agents have a very low risk of nephrogenic systemic fibrosis when appropriately selected and administered, but extra precautions may be necessary for people with acute kidney injury or severe kidney failure. Do not change dialysis sessions or pause medicines that affect the kidneys unless your nephrologist, radiologist, or prescribing clinician specifically recommends it.

How to Prepare Safely

Call the imaging center before the appointment if the instructions are unclear. Provide a complete list of prescriptions, over-the-counter medicines, vitamins, supplements, patches, injections, and recent infusions. You can also review trustworthy information about prescription and over-the-counter drugs when confirming the exact names of your medications.

Ask whether you may eat and drink normally. Routine fasting is not required for every contrast-enhanced MRI, but certain abdominal examinations, sedation plans, or procedures have different requirements. If you must fast, ask specifically how to manage diabetes medicines and other drugs normally taken with food.

Bring device identification cards for pacemakers, implanted pumps, stimulators, or other implants. For a broader overview of clothing, metal screening, contrast, and the scanning process, read this guide on how to prepare for an MRI and what to expect.

When to Seek Care

During or immediately after contrast administration, alert the technologist at once if you develop trouble breathing, throat or facial swelling, widespread hives, severe dizziness, faintness, or rapidly worsening symptoms. Emergency evaluation may be necessary for signs of a serious allergic reaction.

Contact the ordering clinician or radiology department if you develop persistent pain, swelling, redness, or blistering near the IV site. People with significant kidney disease should also report unusual skin tightening or hardening, marked swelling, worsening joint stiffness, or unexplained muscle weakness after receiving gadolinium contrast.

The Bottom Line

For most routine MRIs with gadolinium contrast, there are no standard daily medications that everyone must pause. Metformin, blood pressure medicines, blood thinners, and most other prescriptions can usually be continued. The main concerns are ferumoxytol infusions, metallic medication patches, pumps and wearable devices, fasting-related diabetes management, and medicines used for sedation. Follow the imaging center’s instructions and confirm any medication change with the clinician who prescribed it.