By giving your pharmacy the exact name of one's medication it is possible to better safe guard your health.  Insurance is confusing to start with, and yes it is constantly changing.  This is really a common occurrence as January 1 kicks off a fresh year of pharmacy benefits and beneficiaries are kept in (with minor exceptions needless to say called qualifying life events or QLEs) until the next open enrollment season in November.  
https://masters.adminskiracing.com/node/413038