Anatomical Therapeutic Chemical • N02A • Opioids

A Alimentary tract and metabolism

B Blood and blood forming organs

C Cardiovascular system

D Dermatologicals

G Genito urinary system and sex hormones

H Systemic hormonal preparations, excluding sex hormones and insulins

J Antiinfectives for systemic use

L Antineoplastic and immunomodulating agents

M Musculo-skeletal system

N Nervous system

N01 Anesthetics

N02 Analgesics

N02A Opioids

N02AA Natural opium alkaloids

N02AB Phenylpiperidine derivatives

N02AC Diphenylpropylamine derivatives

N02AD Benzomorphan derivatives

N02AE Oripavine derivatives

N02AF Morphinan derivatives

N02AG Opioids in combination with antispasmodics

N02AJ Opioids in combination with non-opioid analgesics

N02AX Other opioids

N02B Other analgesics and antipyretics

N02C Antimigraine preparations

N03 Antiepileptics

N04 Anti-parkinson drugs

N05 Psycholeptics

N06 Psychoanaleptics

N07 Other nervous system drugs

P Antiparasitic products, insecticides and repellents

R Respiratory system

S Sensory organs

V Various