xanthine alkaloids such as caffeine and theophylline.
1 compound · filter the full catalogue by this class
Caffeine is the world's most widely used psychoactive compound, a methylxanthine that works by blocking adenosine receptors. At low to moderate doses it reliably improves alertness, vigilance, attention and reaction time, with weaker and less consistent effects on memory and higher-order judgement. It is the reference point every other stimulant on this wiki gets compared to.