Thank you for the responses, it seems MedicationStatement is the most suitable for GP data we currently hold.
Having looked at the MedicationStatement profile, I have come across some issues while trying to do the mapping, there is no obvious field to store a patient’s prescription quantity and units for example “100 tablets”. Under the Dosage field, there is maxDosePerPeriod, maxDosePerAdministration and maxDosePerLifetime. These fields do not seem suitable to store the total quantity/units prescribed for a patient, they are too specific whereas I’m looking to a generic field to be able to store a patient’s prescription quantity/units. Where could the quantity and units be placed and perhaps clarification of what the above fields mean, would be appreciated.