Alcohol is considered a psychoactive drug because it affects the central nervous system and alters brain function. It leads to changes in mood, behavior, and perception. As a depressant, alcohol slows down brain activity, which can result in sedation, relaxation, and impaired coordination. These effects can become more pronounced with higher doses, leading to significant impairment and potentially dangerous situations. Understanding that alcohol is a psychoactive substance is crucial for recognizing its effects and the risks associated with its consumption.