Common Components FHIR Implementation Guide, published by Australian Digital Health Agency. This guide is not an authorized publication; it is the continuous build for version 26.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/AuDigitalHealth/common-components/ and changes regularly. See the Directory of published versions

Extension: Medication Formula String

Official URL: http://digitalhealth.gov.au/fhir/cc/StructureDefinition/medication-formula-string Version: 26.0.0
Draft as of 2026-07-14 Computable Name: Medication_Formula_String

Copyright/Legal: This content is licensed under a Creative Commons Attribution 4.0 International License. See https://creativecommons.org/licenses/by/4.0/

Captures compounded medication formulas from CDA entry relationships to provide formula information in FHIR Medication resources for the PCEHR Prescription and Dispense View.

The purpose of this extension is to carry compounded medication formula text from CDA sources when equivalent structured representation is not available in the base FHIR Medication model.

Context of Use

    This extension may be used on the following element(s)

Usage info

Usages:

You can also check for usages in the FHIR IG Statistics

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension(4.0.1) Medication Formula String
... extension 0..0 Extension
... url 1..1 uri "http://digitalhealth.gov.au/fhir/cc/StructureDefinition/medication-formula-string"
... value[x] 0..1 string Medication formula text

doco Documentation for this format
NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension(4.0.1) Medication Formula String
Constraints: ext-1
... id 0..1 string Unique id for inter-element referencing
... extension 0..0 Extension
Slice: Unordered, Open by value:url
Constraints: ext-1
... url 1..1 uri "http://digitalhealth.gov.au/fhir/cc/StructureDefinition/medication-formula-string"

doco Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type string: Captures compounded medication formulas from CDA entry relationships to provide formula information in FHIR Medication resources for the PCEHR Prescription and Dispense View.

Differential View

This structure is derived from Extension

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension(4.0.1) Medication Formula String
... extension 0..0 Extension
... url 1..1 uri "http://digitalhealth.gov.au/fhir/cc/StructureDefinition/medication-formula-string"
... value[x] 0..1 string Medication formula text

doco Documentation for this format

Snapshot View

NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
.. Extension 0..* Extension(4.0.1) Medication Formula String
Constraints: ext-1
... id 0..1 string Unique id for inter-element referencing
... extension 0..0 Extension
Slice: Unordered, Open by value:url
Constraints: ext-1
... url 1..1 uri "http://digitalhealth.gov.au/fhir/cc/StructureDefinition/medication-formula-string"

doco Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type string: Captures compounded medication formulas from CDA entry relationships to provide formula information in FHIR Medication resources for the PCEHR Prescription and Dispense View.

 

Other representations of profile: CSV, Excel, Schematron

Constraints

Id Grade Path(s) Description Expression
ele-1 error Extension, Extension.value[x] All FHIR elements must have a @value or children hasValue() or (children().count() > id.count())
ext-1 error Extension Must have either extensions or value[x], not both extension.exists() != value.exists()