Valerian

Alcohol multiplies the sedation and reaction-time impairment of this medicine. The two clocks run separately: the 8-hour alcohol restriction (and the 0.02 g/100 ml limit) and the medicine's own washout period — you are only clear once the later of the two has passed and you are completely side-effect free.

No aviation duty within 8 hours of any alcohol — and never above 0.02 g/100 ml blood alcohol concentration.

Many liquid medicines (cough mixtures, elixirs, tinctures, tonics, some drops and mouthwashes) contain ethanol as a solvent, and the label may only say 'ethanol', 'alcohol' or 'spiritus'. No aviation duty within 8 hours of consuming any alcohol, and never with a blood alcohol concentration of 0.02 g/100 ml or higher (CAR 91.02.3 / Part 67). Alcohol also multiplies the sedating effect of antihistamines, benzodiazepines, opioids and Z-drugs. Choose an alcohol-free preparation whenever one exists, and check the label of every liquid medicine before duty.