Core information standard: CORE INFORMATION STANDARD IMPLEMENTATION GUIDANCE
3.29 Medications and medical devices
The medications section allows for using structured dose and timing information that is machine readable to facilitate the reading and transfer of medications information between systems and providers of care, through the structured dose direction cluster. Technical guidance for implementing the structured dose and timing in Fast Healthcare Interoperable Resource (FHIR) messaging is available from NHS Digital https://developer.nhs.uk/apis/dose-syntax-implementation/.
The free text Dose directions description is the form of dosage direction typically used in UK GP Systems.
Dose direction duration can be derived from the start and end dates if no other information is available.
When sharing Dose duration direction, the following examples are provided to clarify definitions for two of the coded text items which appear similar. In both cases, these directions are not an absolute instruction. They are:
- ‘continue medication indefinitely’ - ongoing treatment planned for example when starting daily aspirin or a statin. There will be circumstances where you would stop them such as a GI bleed.
- ‘do not discontinue’ refers to medication where suddenly stopping could be dangerous, for example the abrupt withdrawal of long-term steroids.
The medication change cluster and medications discontinued cluster both derive from discharge standards to ensure clarity of what medications had changed or been stopped in hospital. They are retained in the core information standard as they may still be useful to professionals in understanding previous medications.
The Medical devices element is for medical devices that cannot be prescribed and do not have representation in the NHS dictionary of medicines and medical devices (dm+d). Whilst medical devices that can be prescribed in primary care are generally well represented in dm+d, there are other kinds of devices used in hospital care which may not be so this section provides for this.
Page last updated: 06 January 2026