IHE Pharmacy Medication Overview, published by Integrating the Healthcare Enterprise (IHE). This guide is not an authorized publication; it is the continuous build for version 1.0.0-preview2 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/IHE/pharm-meow/tree/r4 and changes regularly. See the Directory of published versions
Built from commit b1e06305.   Branch: r4.

Issues

Page standards status: Informative

1. how to identify drugs and different granularities (from dispense to presc to MTL)
2. OTC should be considered to MTL?
3. examples and profiles check
4. …

please see also here