<MedicationRequest>
  <id value="a8ca980c-72aa-11e7-8cf7-a6006ad3dba0" />
  <contained>
    <Medication>
      <id value="med1" />
      <code>
        <coding>
          <system value="http://snomed.info/sct" />
          <code value="322307006" />
          <display value="Co-codamol 8mg/500mg tablets" />
        </coding>
      </code>
    </Medication>
  </contained>
  <status value="active" />
  <intent value="order" />
  <medicationReference>
    <reference value="#med1" />
  </medicationReference>
  <subject>
    <identifier>
      <system value="https://fhir.nhs.uk/Id/nhs-number" />
      <value value="9999999999" />
    </identifier>
  </subject>
  <dosageInstruction>
    <patientInstruction value="Additional doses only to be taken after migraine recurrence" />
    <timing>
      <repeat>
        <frequency value="1" />
        <period value="4" />
        <periodUnit value="h" />
      </repeat>
    </timing>
    <asNeededCodeableConcept>
      <coding>
        <system value="http://snomed.info/sct" />
        <code value="37796009" />
        <display value="Migraine" />
      </coding>
    </asNeededCodeableConcept>
    <doseQuantity>
      <value value="2" />
      <unit value="tablet" />
      <system value="http://snomed.info/sct" />
      <code value="428673006" />
    </doseQuantity>
    <maxDosePerPeriod>
      <numerator>
        <value value="6" />
        <unit value="dose" />
        <system value="http://snomed.info/sct" />
        <code value="3317411000001100" />
      </numerator>
      <denominator>
        <value value="24" />
        <unit value="hour" />
        <system value="http://unitsofmeasure.org/" />
        <code value="h" />
      </denominator>
    </maxDosePerPeriod>
  </dosageInstruction>
</MedicationRequest>