3,7-Dihydro-1,3,7-trimethyl-1H-purine-2,6-dione; 1,3,7-Trimethylxanthine; 7-Methyltheophylline; Alert-Pep; Cafalgine; Cafeina; Caffedrine; Caffein; Cafipel; DHCplus; Dasin; Diurex; Durvitan; Guaranine; Hycomine; Koffein; Mateina; Methyltheobromine; Miudol; NSC 5036; New Cetamol; No-Doz; Palergot-C; Phensal; Refresh'n; SK 65 Compound; Shape Plus; Stay Alert; Stim; Synalgos; Thein; Theine; Tri-Aqua; Wigraine

Caffeine is a naturally occurring chemical that is present in tea, cola nuts, guarana and coffee. It is able to stimulate the central nervous system, cardiac muscle, stimulate the respiratory system, act as a diuretic and delay fatigue. The chemical structure for caffeine is 1,3,7-tri methylxanthine. As a modified purine it can act as an inhibitor of enzymes that use compounds containing adenine or guanine as substrates.