Which type of substances is considered a stimulant?

Stimulants are substances that increase the activity of the central nervous system, leading to heightened alertness, increased energy, and often euphoria. Cocaine is a clear example of a stimulant as it works by blocking the reuptake of dopamine in the brain, leading to increased levels of this neurotransmitter and resulting in stimulation of both the mind and body.

In contrast, marijuana primarily acts as a depressant, although it has complex effects that can be both stimulating and sedating, making it not a true stimulant. Depressants, as a class, lower brain activity and diminish alertness. Narcotics typically refer to opioids that also have depressant effects, primarily used for pain relief, and do not increase activity in the way stimulants do. Therefore, the classification of cocaine as a stimulant is accurate and aligns with its pharmacological effects on the body.