If you take legally prescribed drugs it is your responsibility to speak with your GP or consultant and follow their advice about driving. Police advise you keep evidence with you of your prescription when driving.
It’s fine to drive when taking prescription drugs if you’re following your doctor’s advice and you’re not impaired.
The measurement of drugs is conducted in microgrammes per litre of blood. A microgramme is one millionth of a gramme.
This the list of thresholds for prosecution for illegal drugs:
(metabolite of cocaine)
|lysergic acid diethylamide
|List of thresholds for ‘medicinal’ drugs:|
Separate approach (to balance its risk against legitimate use and abuse)