United Kingdom. Department of Transport. [gov.uk] [UK] Public approval for driving limits for 16 drugs. (27 Mar 2014)

Medicines and Healthcare products Regulatory Agency. (2016) Citalopram: suspected drug interaction with cocaine; prescribers should consider enquiring about illicit drug use. Drug Safety Update, 9, (12),

United Kingdom. Government Digital Service. (2025) UK information. Drug misuse and dependency.