Will my doctor see what I got at another pharmacy?

Maybe. A doctor may call up any pharmacy in the U.S. To get your prescription history. This is easier with large chains like cvs, walgreens, duane reade, rite aid, target, and wal-mart where all that company's pharmacies have a central computer. In addition, there are programs in several states where certain medications are registered in a central database for a doctor to access.