Why can alcohol make a person less coordinated and slower to react?

Alcohol is classified as a depressant that impacts the central nervous system. Its effect on coordination and reaction time is not caused by direct damage to muscles or sensory organs, but rather by its influence on the specific brain centers responsible for controlling muscle activity and processing information.21

As blood alcohol concentration (BAC) rises, the brain's ability to manage neuromuscular functions and reflex responses diminishes. Even at low concentrations, laboratory tests show that alertness, visual acuity, and the capacity to distinguish between sensory signals are reduced. Because alcohol impairs the brain's higher functions—including judgment and the ability to process multiple streams of information simultaneously—complex tasks become significantly more difficult to perform.32

At higher levels of intoxication, these impairments manifest physically as slurred speech, unsteady gait, and a major loss of balance and physical control. Ultimately, alcohol acts as a sedative on the brain, and in extreme cases, it can suppress vital functions to the point of coma or respiratory arrest.23