Other subjects explored include hydrogen bonding effects on the photochemistry of chromophores in solution, photochemical generation of silicon-centered radicals and their reactions, and photochemical processes at the air-water interface of atmospheric droplets.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class of psychoactive drugs. It is the world's most widely consumed psychoactive drug, but unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world.
Many common drugs fall into the following drug classes: 1  selective serotonin reuptake inhibitors (SSRIs) 2  serotonin and norepinephrine reuptake inhibitors (SNRIs) 3  tricyclic antidepressants (TCAs)  tetracyclic 1  antidepressant. dopamine reuptake blocker.  5-HT1A receptor 1  antagonist. 5-HT2 receptor antagonists.  5-HT3 receptor antagonist.