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LSD Flashbacks

LSD Flashbacks

Giordano Novak

Giordano Novak

Medically reviewed by Giordano Novak, University of São Paulo on April 3rd 2022

Key Takeaways:

  • LSD flashbacks are not common but can be experienced by some who have taken acid.
  • It is possible to reduce the risk of experiencing flashbacks with proper preparation and safety measures.
  • Flashbacks can be unpleasant but not dangerous, and coping strategies are available if you experience one.


Have you ever had the feeling that you’ve been here before? That’s what we call a “flashback” in psychedelic lingo, and it can be an unexpectedly intense experience.

LSD flashbacks are intense re-experiences of the drug’s effects, even without taking any LSD. The phenomenon is thought to be caused by an accumulation of residual psychedelic molecules in the brain and body.

So why do they happen, and how can we ensure they don’t turn into something scarier than expected? Let’s dive right in and find out!


LSD And Its Components

LSD (lysergic acid diethylamide) is a popular hallucinogenic drug that produces feelings of euphoria, peace and enlightenment among users. 

It’s derived from ergot fungus found in rye grain, which Albert Hofmann first synthesized in 1938 [1].

It works by altering serotonin levels in the brain and heightening sensory perceptions. It also causes vivid colours, sounds and visions that can last for hours or even days.

It comprises three main components: lysergic acid, diethylamide, and other chemicals. 

The lysergic acid component can stay in the body for weeks or even months after a single use, and this is thought to be one of the main culprits behind flashbacks.

In addition to its effects on the brain, LSD drug use also affects the body. It increases blood pressure and heart rate and can cause nausea or vomiting, leading to extreme emotional reactions such as anxiety or fear.

If you are experiencing flashbacks and feel anxious or panicked, you should seek medical help. They would likely refer you to a psychiatrist or the American Board of Addiction Medicine (ABAM) [4].


Erika Dyck LSD Quote (White)


What You Need To Know About LSD Flashbacks

When LSD is taken, its effects can last for hours or even days. Long after the drug has worn off, people may experience vivid flashbacks of their LSD trip.

These are called “flashbacks” or “hallucinogen-persisting perception disorder” (HPPD) [2]. They involve sensations similar to those experienced while under the influence of the drug and can be quite intense.

These mental disorders can occur a few days or even months after taking LSD and can include visual disturbances such as vivid colors, shapes, and objects that appear to be moving.

Although not everyone who has taken LSD will have a flashback, it is a critical issue to be aware of in case you do experience it. People who have had exciting trips are more likely to suffer from flashbacks.

It’s also possible that regular users may become more prone over time due to an accumulation of residual psychedelic molecules in their brains.


Here are some signs that you may be experiencing a flashback:

  • Visual disturbances such as bright lights or geometric shapes.
  • Sound distortions like ringing in the ears or echoes.
  • Feelings of being disconnected from reality, such as floating away or time dilation.
  • Body sensations mimic the effects of LSD, such as nausea, muscle tension, and chills.
  • Intense feelings of anxiety, fear or other powerful emotions.


Pro Tip: If you think someone is having a flashback, it’s important to stay calm and provide a comforting environment for them.


Reasons Why You Experience Acid Flashbacks

Have you ever wondered why some people experience LSD flashbacks? Flashbacks are intense re-experiences of the drug’s effects, even without taking LSD. 

It is thought to be caused by an accumulation of residual psychedelic molecules in the brain and body.

Here are some common reasons why people experience flashbacks:


Significant distress can be a major factor in causing LSD flashbacks. Stressful events or situations can trigger the release of residual molecules stored in the brain, causing an intense re-experience of the drug’s effects.

These effects may include visual disturbances, sound distortions, and body sensations mimicking those of taking the drug. 

Additionally, stress can cause an increase in cortisol levels which leads to increased anxiety and fear, two common reactions when having a flashback.

Sleep Deprivation

Sleep deprivation is another COMMON reason for experiencing LSD flashbacks. People who don’t get enough sleep are more likely to have vivid and intense dreams that feel like reality when they finally enter REM sleep.

This means that the vivid and complex visual, auditory, and emotional experiences of an LSD trip can be re-experienced during dream states, leading to flashbacks. 

So if you’re having flashbacks after taking LSD, it may be a good idea to ensure you’re getting enough rest.

Drug Interactions

Drug interactions may also cause LSD flashbacks. Certain medications, such as anti-depressants or MAO inhibitors, may INTERACT with the remaining psychedelic molecules in your system and trigger a flashback.

It’s important to talk to your doctor if you think this might be happening. They can help you determine the best course of action regarding any drug interactions you may have experienced.

Previous Use

Also, your previous LSD use is another common cause of flashbacks. Flashbacks occur more frequently in those who have had an exciting LSD trip and taken the drug on MULTIPLE occasions.

It’s thought that regular users may become more prone to flashbacks over time due to accumulating residual psychedelic molecules in their brains. 

So if you’ve taken LSD several times, it’s essential to be aware of this possibility and plan accordingly.

Intensity of Experience

Additionally, the intensity of your experience may also be a factor in experiencing flashbacks. Some people report that their flashbacks are particularly vivid and intense when they were having powerful trips.

Residual Psychotropic Molecules (RPMs)

Finally, Residual Psychotropic Molecules (RPMs) are molecules that REMAIN in the brain after taking psychedelics [3]. 

These molecules can be stored for a prolonged period and may be released when a person is exposed to certain environmental triggers or stressors.

This could explain why some people experience LSD flashbacks years after their last dose – because they still have residual psychedelic molecules in their brains.


Pro Tip: Try to manage your stress and get enough rest if you’re prone to having acid flashbacks.


How Long Until LSD-Induced Flashbacks Stop?

The length of LSD-induced flashbacks can vary widely from person to person. Generally, these types of flashbacks tend to dissipate between one week and several months after the last dose was taken.

It is important to note that although some people may experience them for extended periods, these hallucinations are usually quite fleeting and don’t last for very long in most cases.

Additionally, it is possible that if you take a break from consuming psychedelics, your flashbacks will stop completely. However, if you continue taking the drug, it may linger or even become more intense.

Therefore, it is wise to keep track of your usage and consider taking breaks as necessary to minimize any potential effects associated with acid flashbacks.


Pro Tip: Try taking regular breaks from psychedelics and managing your stress.


Best Place to Buy LSD Online in Canada

If you are looking for a reliable place to buy LSD online in Canada, several websites and vendors are available. 

Doing your research before purchasing is important to ensure that the website or vendor is trustworthy and provides a quality product.

Additionally, read customer reviews to understand what other people think about the website or vendor. Finally, make sure to check their policies and regulations before mase to ensure that the transaction is legal and secure.



LSD flashbacks can be a disturbing experience, but there are ways to reduce your risk of having them.

The most important things to remember are to pay attention to potential drug interactions, limit your usage of psychedelics, and manage stress levels.

By following these tips, you can minimize the occurrence of LSD flashbacks and enjoy the psychedelic experience without any long-term effects.



  1. Editors. LSD. HISTORY. Published June 14, 2017. Accessed January 3, 2023.
  2. Halpern JH, Lerner AG, Passie T. A Review of Hallucinogen Persisting Perception Disorder (HPPD) and an Exploratory Study of Subjects Claiming Symptoms of HPPD. Behavioral Neurobiology of Psychedelic Drugs. Published online 2016:333-360. doi:10.1007/7854_2016_457
  3. Seo MS, Scarr E, Lai CY, Dean B. Potential Molecular and Cellular Mechanism of Psychotropic Drugs. Clinical Psychopharmacology and Neuroscience. 2014;12(2):94-110. doi:10.9758/cpn.2014.12.2.94
  4. Levreau D. Home. Published 2015. Accessed January 3, 2023.
  5. Radcliffe, S. (2017, January 6). Illegal Drugs Are Now Used as Medicine. Healthline. Available at:

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