Many psychoactive drugs are prescribed to children to treat depression, but have not been adequately tested on children. The use of these drugs for children is therefore referred to as:

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath. 

It allowed for things to be produced much more quickly and efficiently