Alcohol Most adverse effects of alcohol are associated with the brain, the eyes, and the inner ear. Effects on the brain include impaired reaction time, reasoning, judgment, and memory. Alcohol also decreases the ability of the brain to make use of oxygen. The atmosphere in an aircraft is pressurized. Any alcohol you consume will affect you more noticably than at sea level.
Moderation is a good policy at any altitude.
Keep in mind that over indulgence of alcohol can result in boarding being denied, or you being unloaded before your destination. For more information regarding this subject, see our section on unruly passengers.