Stimulants are drugs that speed up the activity of the central nervous system. Some stimulants are successfully used to treat conditions such as AD/HD, narcolepsy, asthma, obesity, and depression. Most stimulants are a controlled substance because they have high potential for abuse. There are several types of stimulants, with the most common being caffeine, nicotine, and cocaine.

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addiction SUD Substance Use Disorder drug drugs