Via the NHS they'd be able to get methylphenidate or a number other drugs to help treat ADHD alot of these drugs work as stimulates that work for long periods of time making them much more effective then energy drinks regarding convenience

But I still get your concern as waiting lists are quite long In this country but there are other forms of caffeine as well that are alot more healthy, I still think this ban is awful though but it's not the end of the world for people with ADHD I luckily don't think