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Guidelines for ATC classification and DDD assignment - WHOCC

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VIII. <strong>ATC</strong>/<strong>DDD</strong> INTERPRETATIVE GUIDELINES<br />

This book includes all <strong>ATC</strong> headings down to the 4th level.<br />

The comments included vary from one <strong>ATC</strong> group to another. No comments are<br />

given if the establishment of <strong>ATC</strong> codes <strong>and</strong> <strong>DDD</strong>s is considered to cause no<br />

special problems.<br />

Comments related to the <strong>assignment</strong> of <strong>DDD</strong>s are given in shadowed boxes.<br />

The interpretative guidelines that follow should be consulted whenever the<br />

<strong>ATC</strong>/<strong>DDD</strong> system is used <strong>for</strong> drug utilization research. They describe particular<br />

issues that were discussed <strong>and</strong> resolved by consensus of the Working Group during<br />

deliberation while establishing <strong>ATC</strong>/<strong>DDD</strong>s. If no special problems or issues arose<br />

during that process, no comments are given.<br />

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