Chemical Dependency Counselor Practice Exam 2025 – Comprehensive All-in-One Guide to Exam Success!

Cocaine is classified as a stimulant because it works by increasing the levels of dopamine, a neurotransmitter associated with pleasure and reward, in the brain. This happens by inhibiting the reuptake of dopamine, leading to enhanced levels in the synaptic cleft and producing feelings of euphoria, heightened energy, and alertness. Stimulants like cocaine can elevate heart rate, boost blood pressure, and energize the user, which distinguishes them from other drug categories.

In contrast, alcohol is categorized as a depressant, affecting the central nervous system by slowing brain activity and producing sedative effects. Heroin is classified as an opioid, which is primarily used for pain relief and can induce euphoria but often results in respiratory depression and sedation rather than stimulation. Barbiturates are also depressants that calm the central nervous system and can induce sleep, making them the opposite of stimulants. Thus, cocaine stands out as the sole stimulant among the provided options.