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.

Prednisolone 5mg tablets, have 8 tablets a day after food for 7 days then stop

Product-based prescription with course length, when and additional instruction. 
<MedicationRequest xmlns="http://hl7.org/fhir">
    <id value="a2477cc3-432c-420a-a219-c6bf5af646da" />
    <contained>
        <Medication>
            <id value="internalMedicationIdnetifierXYZ" />
            <code>
                <coding>
                    <system value="http://snomed.info/sct" />
                    <code value="325427002" />
                    <display value="Prednisolone 5mg tablets" />
                </coding>
            </code>
        </Medication>
    </contained>
    <status value="active" />
    <intent value="order" />
    <medicationReference>
        <reference value="#internalMedicationIdnetifierXYZ" />
        <display value="Prednisolone 5mg tablets" />
    </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="422327006" />
                <display value="Then stop" />
            </coding>
        </additionalInstruction>
        <timing>
            <repeat>
                <boundsDuration>
                    <value value="7" />
                    <unit value="day" />
                    <system value="http://unitsofmeasure.org" />
                    <code value="d" />
                </boundsDuration>
                <frequency value="1" />
                <period value="1" />
                <periodMax value="1" />
                <periodUnit value="d" />
                <when value="PC" />
            </repeat>
        </timing>
        <doseQuantity>
            <value value="8" />
            <unit value="tablet" />
            <system value="http://snomed.info/sct" />
            <code value="428673006" />
        </doseQuantity>
    </dosageInstruction>
</MedicationRequest>

{
    "resourceType": "MedicationRequest",
    "id": "a2477cc3-432c-420a-a219-c6bf5af646da",
    "contained":  [
        {
            "resourceType": "Medication",
            "id": "internalMedicationIdnetifierXYZ",
            "code": {
                "coding":  [
                    {
                        "system": "http://snomed.info/sct",
                        "code": "325427002",
                        "display": "Prednisolone 5mg tablets"
                    }
                ]
            }
        }
    ],
    "status": "active",
    "intent": "order",
    "medicationReference": {
        "reference": "#internalMedicationIdnetifierXYZ",
        "display": "Prednisolone 5mg tablets"
    },
    "subject": {
        "identifier": {
            "system": "https://fhir.nhs.uk/Id/nhs-number",
            "value": "9999999999"
        }
    },
    "dosageInstruction":  [
        {
            "additionalInstruction":  [
                {
                    "coding":  [
                        {
                            "system": "http://snomed.info/sct",
                            "code": "422327006",
                            "display": "Then stop"
                        }
                    ]
                }
            ],
            "timing": {
                "repeat": {
                    "boundsDuration": {
                        "value": 7,
                        "unit": "day",
                        "system": "http://unitsofmeasure.org",
                        "code": "d"
                    },
                    "frequency": 1,
                    "period": 1,
                    "periodMax": 1,
                    "periodUnit": "d",
                    "when":  [
                        "PC"
                    ]
                }
            },
            "doseQuantity": {
                "value": 8,
                "unit": "tablet",
                "system": "http://snomed.info/sct",
                "code": "428673006"
            }
        }
    ]
}
MedicationRequest.id[0]a2477cc3-432c-420a-a219-c6bf5af646da
MedicationRequest.contained[0].id[0]internalMedicationIdnetifierXYZ
MedicationRequest.contained[0].code[0].coding[0].system[0]http://snomed.info/sct
MedicationRequest.contained[0].code[0].coding[0].code[0]325427002
MedicationRequest.contained[0].code[0].coding[0].display[0]Prednisolone 5mg tablets
MedicationRequest.status[0]active
MedicationRequest.intent[0]order
MedicationRequest.medication[0].reference[0]#internalMedicationIdnetifierXYZ
MedicationRequest.medication[0].display[0]Prednisolone 5mg tablets
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]422327006
MedicationRequest.dosageInstruction[0].additionalInstruction[0].coding[0].display[0]Then stop
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].bounds[0].value[0]7
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].bounds[0].unit[0]day
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].bounds[0].system[0]http://unitsofmeasure.org
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].bounds[0].code[0]d
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].frequency[0]1
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].period[0]1
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].periodMax[0]1
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].periodUnit[0]d
MedicationRequest.dosageInstruction[0].timing[0].repeat[0].when[0]PC
MedicationRequest.dosageInstruction[0].dose[0].value[0]8
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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