Under the influence: Drug driving calculator

Find out how your medication could impact your ability to drive.

When it comes to 'driving under the influence' many drivers wouldn't consider their over-the-counter hay fever medication as being particularly dangerous.

However, the rules are never that straightforward, leaving many confused as to what medication you're able to take and still be able to drive.

Our drug-driving calculator looks at the legal limits for driving after taking common over-the-counter and prescription medications. In the interest of completeness, common illegal drugs have also been included as they have an 'accidental exposure' limit when it comes to driving.

Take a look at our in-depth guide for more information on drug-driving and the law.