There is an order on someone's MAR for a PRN calcium channel blocker. Supposedly the MD made it PRN because one of a communication in put that this particular person had the med held often. The cartizam was scheduled QID previously and held about every other time. Why would it go from QID to PRN, why not once Or twice a day? Or why not have a different BP med? Has anyone else come across a PRN BP med, and know why this is done (and shouldn't there be an order for daily BPs, or twice a day) To go along with this?