This information will help prevent an allergic reaction to the contrast dye you’ll receive during your scan.
About Contrast Dye
Sometimes, contrast dye (or contrast) is used in imaging scans to help your doctors see your organs better. There are different kinds of contrast used. Computed tomography (CT) scans and magnetic resonance imaging (MRI) use different kinds of contrast.
Preventing an Allergic Reaction to Contrast with Medication
In the past, you had an allergic reaction to contrast you got during a scan. You’re having another scan that requires the same type of contrast. To prevent an allergic reaction, you’ll need to take a steroid medication before your scan. Remember, having an allergic reaction to one type of contrast doesn’t mean you need premedication for another type of contrast.
There are different medications that you can take to prevent an allergic reaction. Your doctor will tell you which one you need and give you a prescription for it.
Prednisone
If you’re taking prednisone before your scan, you’ll have to take 3 doses of it. Take the first dose 13 hours before your scan, the second dose 7 hours before your scan, and the third dose 1 hour before your scan. If you have any questions about when to take your medication, ask your nurse.
Methylprednisolone
If you’re taking methylprednisolone before your scan, you’ll have to take 2 doses of it. Take the first dose 12 hours before your scan and the second dose 2 hours before your scan. If you have any questions about when to take your medication, ask your nurse.
Other medications
You may need to take other medications or a different medication instead. If you do, your doctor will write more instructions in the “Notes” section.
If you have any questions about your premedication plan, call the doctor that ordered your premedication.