WHOCC
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WHO Collaborating Centre for Drug Statistics Methodology
Norwegian Institute of Public Health
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0403 Oslo
Norway

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N NERVOUS SYSTEM

N01 ANESTHETICS

No DDDs have been established in this group because the doses used vary substantially.

N02 ANALGESICS

This group comprises general analgesics and antipyretics.

All salicylic acid derivatives except combinations with corticosteroids are classified in N02BA - Salicylic acid and derivatives, as it is difficult to differentiate between the use of salicylates in rheumatic conditions and other therapeutic uses of salicylates.

All plain ibuprofen preparations are classified in M01A, even if they are only intended for use as pain relief.

Salicylic acid derivatives in combination with corticosteroids are classified in M01B.

There are a number of combined preparations, which contain analgesics and psycholeptics. These are classified in N02, as pain relief must be regarded as the main indication. Analgesics used for specific indications are classified in the respective ATC groups. E.g.:

A03D/
A03EA - Antispasmodic/psycholeptics/analgesic combinations
M01 - Antiinflammatory and antirheumatic products
M02A - Topical products for joint and muscular pain
M03 - Muscle relaxants

See comments to these groups.

Lidocaine indicated for postherpetic pain is classified in N01BB.

N03 ANTIEPILEPTICS
N04 ANTI-PARKINSON DRUGS

This group comprises preparations used in the treatment of Parkinson's disease and related conditions, including drug-induced parkinsonism.

The DDDs are based on recommended doses for the long-term treatment of symptoms of Parkinson's disease.

No separate DDDs are established for oral depot formulations.

N05 PSYCHOLEPTICS

The group is divided into therapeutic subgroups:

N05A - Antipsychotics
N05B - Anxiolytics
N05C - Hypnotics and sedatives

N06 PSYCHOANALEPTICS

This group comprises antidepressants, psychostimulants, nootropics anti-dementia drugs and combinations with psycholeptics.

Antiobesity preparations are classified in A08 - Antiobesity preparations, excl. diet products.

N07 OTHER NERVOUS SYSTEM DRUGS

This group comprises other nervous system drugs, which cannot be classified in the preceding 2nd levels in ATC group N.

Last updated: 2013-12-19