Guidelines for ATC classification and DDD assignment - WHOCC

Plain preparation Preparations containing one active component (page 18).
Pseudo-double medication The simultaneous use of two chemically different substances
with similar pharmacodynamic properties (page 36).
U Unit, both international as well as others (page 27).
UD The unit dose is used when a DDD for various reasons cannot
be given in amount of active ingredient (page 27).
USAN United States Adopted Name (page 15).
WHO Collaborating Centre The centre responsible for the development and
for Drug Statistics maintenance of the ATC/DDD system (page 11).
Methodology
WHO Collaborating Centre A collaborating centre situated in Uppsala, Sweden,
for International Drug which receives spontaneous reports of suspected
Monitoring adverse reactions from national centres and carries the
operational responsibilities for WHO´s programme on
International Monitoring (page 36).
WHO Drug Information Published by WHO 4 times a year to bring issues of primary
concern to drug regulators and pharmaceutical manufacturers
to the attention of a wide audience of health professionals
and policy-makers concerned with the rational use of drugs.
Publishes the new ATC codes/DDD approved at the working
group meetings (page 39, 41, 43). Can be ordered from:
Marketing and Dissemination, World Health Organization,
1211 Geneva 27, Switzerland,
Telephone: +41 22 791 24 76, Fax: +41 22 791 48 57
Email: publications@who.int
WHO International Working WHO appointed experts in medicine and statistics
Group for Drug Statistics who advise the collaborating centre in the
Methodology assignment of ATC/DDD and carries out research into the
use of these methodologies in drug utilization. The Working
Group meets two times a year, normally March and October
(page 12).
WHO Pharmacological Action A standard list of terms in current use describing
and Therapeutic Use of Drugs – pharmacological action and therapeutic use of
List of Terms pharmaceuticals. All rights are reserved by WHO. Limited
distribution (page 15).
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