Rule 96, Highway code – drugs & Medicine

The Highway Code applies to England, Scotland and Wales and is essential reading for everyone.
Rule 96

You MUST NOT drive under the influence of drugs or medicine. Check the instructions or ask your doctor or pharmacist. Using illegal drugs is highly dangerous. Never take them if you intend to drive; the effects are unpredictable, but can be even more severe than alcohol and may result in fatal or serious road crashes.