transtornos due to uso of caffeine are characterised by the padrão and consequences of caffeine uso. Caffeine is a leve psychostimulant and diuretic that is found in the beans of the coffee plant (Coffea species) and is a constituent of coffee, cola drinks, chocolate, a range of proprietary 'energy drinks' and weight-loss aids. It is the most commonly used psychoactive substance worldwide and several clinical conditions related to its uso are described, although grave transtornos are comparatively rare considering its ubiquity. Caffeine intoxicação related to consumption of relatively higher doses (i.e., > 1 g per day) is described. Caffeine abstinência is common upon cessation of uso among individuals who have used caffeine for a prolonged period or in large amounts. Caffeine-Induced Anxiety transtorno has been described, often following intoxicação or heavy uso.