Non standard drug_concept_id mapped to standard concept with different concept_class
As per OMOP CDM v5.3 , we need to consider below given concept_class for drug exposure but some non standard drug_concept_id is mapped to standard drug_concept_id with cconcept_class like Marketed Product.
Do we need to consider such standard concept_id which belongs to different concept_class
You seem to confuse Concept Class and Drug Class. One is an attribute of a Concept, as explained in the text. The other one is it’s own Concept, denoting a Drug Classification from another vocabulary, like ATC. The text really is not clear about that. Did you get that from the Book of OHDSI?