Is there a way to access defined daily dose (DDD) information for drugs, as created by the WHO (https://www.whocc.no/ddd/definition_and_general_considera/) within the OMOP common data model. The WHO connects ATC codes to this index so it would presumably be a relatively simple mapping, but I haven’t seen DDD among the vocabularies that are currently being updated.
Daily dose is a part of ATC codes, so it (ideally) would be incorporated into the mapping from ATC to RxNorm so that ATC codes with specific daily dosages will be mapped to corresponding RxNorms with the appropriate dosages. Still work in progress though, see here:ATC Working Group: Meeting Agenda and Minutes
Wait, what if someone uses 2 or 4 or 1/2 pills a day? How do you relate daily dosage to the drug product dosage?