Before revision: Drugs used to increase alertness Around the world, the stimulant adenosine receptor antagonist caffeine is widely used to increase alertness or wakefulness and improve mood or performance, typically in the form of drinks like green tea (where it is mixed with bioactive l-theanine), energy drinks ( also containing high amounts of sugar/sugar-substitutes), or coffee ( like teas also containing various bioactive polyphenols).
After revision: Drugs used to increase alertness The stimulant and adenosine receptor antagonist caffeine is widely used to increase alertness or wakefulness and improve mood or performance, typically in the form of drinks like green tea (where it is present alongside the l-theanine), energy drinks ( often containing sugar/sugar-substitutes), or coffee ( which containing various polyphenols).