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The classes of the national extension model are, with the exception of the MP Precisely and the PCD, shown on the right hand side: two of the classes of the national extension model 'mirror' classes in the international model; their concepts represent the real world medicinal products available within a nation that are types of the concepts in the international release:

• the optional Real Medicinal Product (RMP) mirrors the Medicinal Product Only class and represents products marketed by a single organisation (supplier) under a single name (which may be a trade or brand name) and which contain the same set of active ingredient substances
• the Real Clinical Drug (RCD) mirrors the Clinical Drug class and represents a product marketed by a single organisation (supplier) under a single name (which may be a trade or brand name) which contains the same set of active ingredient substances in the same strength and which is formulated within a single dose form; this class, like its partner in the international edition content, is at the core of the specification 

Then there are two three classes in the national extension model that represent classes that are more specific than the classes of the international model in that they represent real either a more specific abstraction of a medicinal product (the MP Precisely) or medicinal products as they are presented in the supply chain in packages for clinical/patient use  in a particular country.  Any sub-packaging used inside a single package (for example, blister strips) and the aggregate packaging used in wholesaling and delivery such as shrink-wraps and pallets are excluded. The two three additional package classes are

• The optional Medicinal Product Precisely (MP Precisely) which is an abstract representation of a medicinal product based on description of only and exclusively the precise active ingredients it contains
• the optional Real Packaged Clinical Drug (RPCD) which is a representation of a packaged product marketed by a single organisation (manufacturer or supplier) under a single name (which may be a trade or brand name) which contains one or more Real Clinical Drugs within it, in set amounts
• the optional Packaged Clinical Drug (PCD) which is an abstract representation of the Real Packaged Clinical Drug, in that it has no manufacturer or supplier information and therefore represents a package containing one or more Clinical Drugs within it, in set amounts

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