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Blackouts Caused by Alcohol or Drugs - Topic Overview

A blackout means not being able to remember what happened when you were drinking or using drugs. Blackouts are not the same as passing out. Passing out occurs when you lose consciousness. You don't pass out when you have a drug or alcohol blackout. In a blackout, you lose short-term memories. A blackout is a type of amnesia.

During a blackout, you may function normally. People around you may not notice anything different about your behavior. You might do the things you normally do, such as eat dinner, wash dishes, or watch television. But later you have no memory of doing them.

Many people who have blackouts aren't worried about them. They might remember feeling good but be unable to remember what they did. This is called euphoric recall. Other people find blackouts very disturbing and seek treatment because of them.

You may pass out during a blackout. This can be caused by the effects of the alcohol or drugs, a head injury from a fall when you were drunk or high, or a seizure. You probably will not remember hurting yourself or having a seizure.

If you think you have blackouts, don't drive or operate any kind of machinery. Talk to your doctor about your blackouts. You might need to be tested for other problems that can cause loss of consciousness.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: March 12, 2014
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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