Exclusivity is the sole marketing rights granted by the FDA to a manufacturer upon the approval of Xanax and may run simultaneously with a patent. Exclusivity periods can run from 180 days to seven years depending upon the circumstance of the exclusivity grant. Xanax is one of the most popular prescribed psychotropic medication in the U.S. to use for anxiety reduction. You can purchase Xanax online used to alleviate epileptic seizures and convulsive states of different origins, often in combination with other anticonvulsant medications.