The MEDPRE message is sent from a prescriber (issuer) of prescriptions (healthcare professionals, i.e. physician,dentist, or veterinarian) to a dispensing agent (i.e. pharmacy) in order to allow the dispenser to deliver dispensed medicines(s) for the treatment of a subject of care (patient,patient group, animal or animal group).

The MEDPRE message may also be sent via a relaying agent for storage until it is requested by a dispenser.  Copies of the message may also be sent to parties entitled to receive a copy.

The MEDPRE message can also be used as a request for a prescription from a dispensing agent to a prescriber.