One would hope all users of these medications would seek and follow guidance from a qualified professional and keep suitable documentation. Otherwise you might up shite creek and no paddle.

However the same goes any condition, migraine, lack of sleep, influenza - if you drive while unfit you lay yourself open to prosecution or even prison if you cause injury or death and you may face civil action and your insurance is invalidated.

However don't worry most people render themselves unfit to drive by using their phone while driving, and life goes on.

Have you ever tried tweeting while overtaking a lorry and trailer on a narrow twisting road - it is not as easy as it looks.