Prescribed medical cannabis doesn't exempt you from road laws. While a medical...

https://www.bookmark-step.win/prescribed-medical-cannabis-is-legal-but-for-uk-drivers-the-2mg-l-thc-limit

Prescribed medical cannabis doesn't exempt you from road laws. While a medical defence exists for the 2mcg/l THC limit, the DVLA requires you to be fit to drive. Legality isn't a safety net; your responsibility for road safety remains absolute.