Blacking out due to alcohol or drug use is a significant health concern that can impact individuals of various ages and backgrounds. Understanding these memory lapses and how they occur is paramount in creating and employing strategies to prevent them.

What Does ‘Blacking Out’ Mean?

Blacking out refers to a period in which you experience partial or complete memory loss. During a blackout, you are unable to recall events that occurred while being intoxicated. This ‘blackout’ is temporary, and your brain cannot form new memories. This is often a product of overindulgence in substances like alcohol and drugs that harm your brain’s functions. Blackouts tend to begin at blood alcohol concentrations (BACs) of about 0.16 percent (nearly twice the legal driving limit) and higher.[1]

Two types of blackouts can affect your memory. In a partial blackout, you may have spotty or fragmented memories of events that occurred while you were under the influence. You may remember some parts of this period but not others. This may also be referred to as a ‘brownout.’

If you suffer a complete blackout, you’ll have no memory whatsoever of what happened during your time of intoxication – your memory loss is total for that time frame. As such, you may only learn of events and your actions via the recollection of others.

How Blackouts Occur

The science behind blackouts can be eye-opening. Here’s a primer:[2]

• Neurotransmitters: Substances like alcohol and benzodiazepines affect the neurotransmitters in your brain – specifically gamma-aminobutyric acid, or GABA. GABA is an inhibitory neurotransmitter that reduces neuronal excitability throughout the nervous system. Alcohol enhances the effects of GABA, leading to sedation, relaxation, and impairment of brain functions.
• Hippocampus: The hippocampus is a part of the brain that forms new memories and transfers short-term memories to long-term storage. Alcohol and some drugs can interfere with the functioning of your hippocampus. They disrupt the ability of neurons located in your hippocampus to communicate effectively. This makes the encoding of new memories less effective.
• Dosage and blood alcohol concentration (or BAC): The likelihood of experiencing a blackout depends on the amount of alcohol or drug that you consume, as well as your level of tolerance. Binge drinking greatly increases the risk of a blackout. Your blood alcohol level also plays a critical role. When your BAC rises quickly, it can overwhelm your brain’s ability to form memories.
• Individual factors: Factors like genetics, age, sex, overall health, and previous experiences with alcohol or drugs affect your susceptibility to blackouts. You may be more prone to blackouts than others based on how your body metabolizes substances and your brain’s reaction to the chemicals.

How To Prevent Blackouts

You may prevent a blackout by employing several strategies focusing on responsible consumption[3]. Here are some ways you can prevent blackouts:

• Moderate consumption: Limit the amount of alcohol or drugs you use in a single day. Stick to recommended guidelines for safe drinking and avoid binge drinking.
• Know your body’s limits: Understand your tolerance to alcohol and drugs. Weight and metabolism can affect how substances impact your body and brain.
• Avoid mixing substances: Combining alcohol with drugs is likely to increase the risk of blackout. Follow the medical advice of professionals when it comes to drinking alcohol or taking drugs while using medications.
• Stay hydrated: Alcohol and drugs may dehydrate you. This can exacerbate the effects of intoxication. Drink water between and during any alcoholic beverages you consume.
• ​​Eat: Consuming food both before drinking or taking drugs can slow down their absorption into your bloodstream. This can blunt their impact, providing more of a buffer to blacking out.
• Avoid shots: Shots may lead to rapid intoxication due to their condensed, high alcohol concentration. Stick to beverages with lower alcohol content and consume them slowly.
• Plan: Make sure you have a safe way to get home BEFORE you start drinking. Avoid situations where you may drink excessively or engage in risky behaviors.
• Monitor yourself: Keep track of how many drinks you have or how many drugs you take. Set limits and stick to them.
• Pace yourself: Alternate alcoholic drinks with glasses of water to your consumption and give your body the time it needs to process the alcohol.
• Recognize warning signs: Learn to recognize the early signs of intoxication. These signs include slurred speech, impaired coordination, and changes in behavior. If you notice any of these signs, it’s time to slow down or stop drinking.
• Have a sober friend: Recruit a friend who can help you monitor your drinking and drug use and make sure you don’t take it too far. They can also help you get home safely if you need to.
• Educate yourself: Research and understand the effects of alcohol and drugs on your body. Knowing the risks will help you make better decisions.
• Find support: If you are blacking out regularly or struggling with controlling your substance use, it may be time to seek help from a healthcare professional or addiction specialist.

Treatment and Support Is Available

If you find yourself drinking or using drugs to the point of blacking out, it’s time to slow down. Treatment options are available, and support is crucial. Get the help you need from medical professionals who can give you the specialized care and attention you deserve.