Dose syntax implementation guidance for FHIR STU3

This guidance is under active development by NHS Digital and content may be added or updated on a regular basis.

Aspirin 300mg dispersible tablets, two tablets to be taken four times daily well diluted in water. To be taken with food.

Product-based prescription using additional instruction field to convey dosing instructions. 
<MedicationRequest xmlns="http://hl7.org/fhir">
    <id value="a8ca980c-72aa-11e7-8cf7-a6006ad3dba0" />
    <contained>
        <Medication>
            <id value="med1" />
            <code>
                <coding>
                    <system value="http://snomed.info/sct" />
                    <code value="329526003" />
                    <display value="Aspirin 300mg dispersible 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>
        <additionalInstruction>
            <coding>
                <system value="http://snomed.info/sct" />
                <code value="417995008" />
                <display value="Dissolve or mix with water before taking" />
            </coding>
        </additionalInstruction>
        <timing>
            <repeat>
                <frequency value="4" />
                <period value="1" />
                <periodUnit value="d" />
                <when value="C" />
                <when value="PC" />
            </repeat>
        </timing>
        <doseQuantity>
            <value value="2" />
            <unit value="tablet" />
            <system value="http://snomed.info/sct" />
            <code value="428673006" />
        </doseQuantity>
    </dosageInstruction>
</MedicationRequest>

{
    "resourceType": "MedicationRequest",
    "id": "a8ca980c-72aa-11e7-8cf7-a6006ad3dba0",
    "contained":  [
        {
            "resourceType": "Medication",
            "id": "med1",
            "code": {
                "coding":  [
                    {
                        "system": "http://snomed.info/sct",
                        "code": "329526003",
                        "display": "Aspirin 300mg dispersible tablets"
                    }
                ]
            }
        }
    ],
    "status": "active",
    "intent": "order",
    "medicationReference": {
        "reference": "#med1"
    },
    "subject": {
        "identifier": {
            "system": "https://fhir.nhs.uk/Id/nhs-number",
            "value": "9999999999"
        }
    },
    "dosageInstruction":  [
        {
            "additionalInstruction":  [
                {
                    "coding":  [
                        {
                            "system": "http://snomed.info/sct",
                            "code": "417995008",
                            "display": "Dissolve or mix with water before taking"
                        }
                    ]
                }
            ],
            "timing": {
                "repeat": {
                    "frequency": 4,
                    "period": 1,
                    "periodUnit": "d",
                    "when":  [
                        "C",
                        "PC"
                    ]
                }
            },
            "doseQuantity": {
                "value": 2,
                "unit": "tablet",
                "system": "http://snomed.info/sct",
                "code": "428673006"
            }
        }
    ]
}
MedicationRequest.id[0]a8ca980c-72aa-11e7-8cf7-a6006ad3dba0
MedicationRequest.contained[0].id[0]med1
MedicationRequest.contained[0].code[0].coding[0].system[0]http://snomed.info/sct
MedicationRequest.contained[0].code[0].coding[0].code[0]329526003
MedicationRequest.contained[0].code[0].coding[0].display[0]Aspirin 300mg dispersible tablets
MedicationRequest.status[0]active
MedicationRequest.intent[0]order
MedicationRequest.medication[0].reference[0]#med1
MedicationRequest.subject[0].identifier[0].system[0]https://fhir.nhs.uk/Id/nhs-number
MedicationRequest.subject[0].identifier[0].value[0]9999999999
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].system[0]http://snomed.info/sct
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].code[0]417995008
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].display[0]Dissolve or mix with water before taking
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].frequency[0]4
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].period[0]1
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].periodUnit[0]d
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].when[0]C
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].when[1]PC
MedicationRequest.dosageInstruction[0].dose[0].value[0]2
MedicationRequest.dosageInstruction[0].dose[0].unit[0]tablet
MedicationRequest.dosageInstruction[0].dose[0].system[0]http://snomed.info/sct
MedicationRequest.dosageInstruction[0].dose[0].code[0]428673006
MedicationRequest
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