Caffeine pill giving you 50mg of the shaky drug in each pill. Supposedly for the "Rapid Relief of Temporary Tiredness", but used extensively (as are other such pills) by people long term.
The people behind pro-plus, "PP Products", have a slightly surreal and very scary website at http://www.proplus.co.uk/ with the following words on the homepage:
If you don't know your Hokey Cokey from your
body popping, booty shaking, electric boogaloo...
then you need to start practising your moonwalk too!
Is that the kind of stuff you write when you abuse their product?