> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-data-analytics-guide/appendix/12.1-project-case-studies/12.1.3-national-medication-decision-support-system-denmark.md).
# National Medication Decision Support System (Denmark)
The National Release Centre of Denmark (National eHealth Authority) produces a SNOMED CT drug extension for medications. The Danish SNOMED CT drug extension was primed by data extraction, cleansing and conversion of content from the Danish Medicine Agency Database (DKMDB), which is primarily meant for pricing and stock handling. The DKMDB was then complemented with SNOMED CT substances and their unique IDs. The Danish SNOMED CT drug extension includes information such as trade names, substances, dose forms, strengths and units of measure.
Building upon the Danish drug extension, the National eHealth Authority is working to introduce centralized decision support (CDS) services for both primary care and hospital prescribing systems.
The CDS server will respond to web service requests from the various electronic medication systems and return alerts and other prescribing information
Denmark medication decision support services overview
Allergies Register
A group of allergy specialists, family practitioners and CDS experts are developing a standard set of information to be used in a patient drug allergy register. A SNOMED CT subset, from the Drug Allergy (disorder) sub hierarchy in the Findings hierarchy, is used to document allergies. .
## Allergy Alert Service
Allergy alerts are enabled by the relationships in SNOMED CT between allergy disorders and substances (via the |causative agent| attribute), and relationships between drug products and substance concepts (via the |has active ingredient| attribute).
## Interactions Service
Based on an existing service, with data primarily drawn from peer-reviewed literature, the interaction database describes 2,500 interactions between different drugs based on their ingredients.
The database contains a short description of all interactions and a recommendation of how the physician can handle the interaction. The ingredients have been linked to SNOMED CT substances to directly inform the decision support service.
## Risk Situation Database
The risk situation database contains drugs evaluated by experts as being potentially dangerous in specific situations. Drug products, ingredients and dose forms are converted to SNOMED CT concepts, which thus contribute to the decision support service.
## Maximum Dose Database
An existing database contains maximum doses for all drugs and recommended doses for patients with impaired renal function. In the decision support service ingredients are once again expressed as SNOMED CT substances.
## Alert Filtering
The decision support platform will incorporate an alert filtering service in which physicians can set up their personal preferences for the displaying of alerts. For example, the dose form hierarchy of SNOMED CT will be used to enable filtering of unwanted alerts for specific dose forms (such as cutaneous dose forms).
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