Annual access to Lexicomp via mobile devices expired on May 31, 2015. You can renew your access by clicking on the "Mobile App Access" link in the upper right hand corner of the Lexicomp home page, and follow the instructions for your particular type of mobile device. You will need to re-download the database.
If you have any questions or concerns about the download process, it is best to contact Lexicomp’s technical support directly. They are excellent! Here is their technical support site: http://www.lexi.com/home/support/
Please note that access to Lexicomp for graduating students will end in August 2015.