Caffeine is the most commonly used drug in the world. It is a naturally occurring substance found in coffee, tea, chocolate, and certain other plants; it is also frequently added to other products such as soda, energy drinks, over-the-counter cold medications, and weight-loss aids. Although consumption of small to moderate doses of caffeine is thought to be safe, some users become dependent on it and are unable to cut back despite problems caused by their intake.
While not technically a diagnosable condition, caffeine-related disorder, or caffeine-use disorder, is listed in the DSM-5 as a condition that warrants further study because the stimulating effects and side effects of caffeine can mimic those of recreational drugs. Some people, particularly adolescents, are known to use and abuse caffeinated products such as energy drinks and to combine caffeine and alcohol for a more potent effect. Caffeine-related disorders include caffeine intoxication and caffeine withdrawal.