Caffeine

Stimulant
Adenosinergic
Eugeroic
Nootropic
Anxiogenic
Analeptic
Competitive Nonselective PDE inhibitor
Diuretic
Raises Intracellular Cyclic AMP
Activates Protein Kinase A
Inhibits TNF-alpha Synthesis
Inhibits Leukotriene Synthesis
Reduces Inflammation
Reduces Innate Immunity
Metabolized in the liver via a single demethylation, resulting in three primary metabolites