Caffeine & related stimulants Alkaloid: methylxanthines CompoundSourceeffect Caffeine Coffee, tea, cola nuts Stimulant of central nervous system, cardiac muscle, and respiratory system, diuretic TheophyllineTeaCardiac stimulant, smooth muscle relaxant, diuretic, vasodilator Theobrominecocoa bean, cola nuts & tea Diuretic, smooth muscle relaxant, cardiac stimulant, vasodilator
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