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.
Each procedure will take between 30-45 minutes. Scanning times will vary, depending on the scanning protocol and machine at each facility. For a more accurate time frame, you should call the facility where you are scheduled and ask how long those exams take.A brain MRI shows brain tissue, ventricles, sinuses etc.t's also real loud, so if you can, bring those little foam ear plugs with you and put them in before hand. Hope it helps! http://wiki.answers.com/Q/How_long_does_an_mri_take. A complete scan, depending on the organs studied, sequences performed, and need for contrast enhancement may take up to one hour or more.