The |Pharmaceutical / biologic product (product)| hierarchy is comprised of multiple smaller hierarchies, e.g. the Medicinal product (product) hierarchy. Supporting subhierarchies from Qualifier value (qualifier value) are also explained in this section of the guide. For implementation guidance regarding national extensions, please see SNOMED CT Drug Model for National Extensions.
A top-level hierarchy to clearly distinguish drug products (products) from their chemical constituents (substances)