Report Abuse. It's not exactly a substitute but it's antiviral medication that is also used to help heal out breaks of herpes and viruses related to it like shingles. Also some people don't react well to acyclovir so Famvir can be used instead. LINDSEY S Â· 5 years ago.
No MRI takes more than 60 minutes. If doctors do not suggest MRI suggest then it will take 30 minutes to 45 minutes. So the question âHow Long Does an MRI Takeâ depends on the requirements of your doctor. If your radiologist has decided for an MRI of the brain plus further requirements, such as IACs (inner auditory canals), orbits or the CCJ (Cervical Cranial Junction), then the test may take 45 minutes.
An MRI scan is a painless procedure which allows your doctor to see detailed images of the inside of your body. You will have the scan in a hospital, but you can usually go home the same day. An MRI scan usually takes between 30 and 50 minutes. However, some scans may last for an hour to an hour and a half.Youâll be told beforehand how long your scan will take.ometimes a special dye (contrast medium) is used during an MRI scan to produce more detailed images. If you have kidney problems, you may need a blood test before your scan to check how well your kidneys are working. If your kidneys arenât working well enough you may not be able to have the contrast medium.