Table 5.

Anatomical therapeutic chemical (ATC) codes used to define medicine groups

Medicine group	ATC code(s)
Opioids	N02A
Anti-epileptic drugs	N03A except N02AE01 (clonazepam)
Anticholinergic agents	N04A
Anti-Parkinson medicines	N04
Antipsychotics	N05A except N05AN01 (lithium) and N05AB04 (prochlorperazine)
Benzodiazepines	N03AE, N05BA and N05CD
Benzodiazepine-related medicines	N05CF
TCAs	N06AA
SSRIs	N06AB
Other antidepressants	N06AG02, N06AX03, N06AX11, N06AX18 and N06AX22
SNRIs	N06AX16, N06AX21 and N06AX23
Anticholinesterases	N06DA

SNRIs serotonin and noradrenaline reuptake inhibitors, SSRIs selective serotonin reuptake inhibitors, TCAs tricyclic antidepressants