What Does Ayahuasca Do to Your Brain

Ayahuasca is a bitter plant brew that has been used for a long time in parts of the Amazon rainforest, and in recent years it has become much better known in other countries too. People hear about it through travel stories, documentaries, retreats and social media, and the accounts they hear are often very different from each other. Some people describe it as a spiritual or healing experience. Others describe it as frightening, confusing or physically very hard. Both kinds of stories can be true for different people, because the brew is powerful, unpredictable, and its effects depend on the person, their health, their state of mind, and what else is in their body at the time. This article does not promote ayahuasca and does not give instructions for using it. It explains, in plain words, what it does to the brain, why thinking and judgement change during the experience, what can go wrong, and what the longer-term risks look like according to research and public-health guidance.

The first thing to understand is that ayahuasca is not a gentle herbal tea. It contains strong psychoactive compounds, which means it changes how the brain processes information. During the experience, which can last for several hours, a person may see vivid images with their eyes open or closed, hear sounds differently, lose track of time, feel strong emotions, and find it hard to tell what is real from what is imagined. Many people also feel very sick, with vomiting and diarrhoea, and their heart may beat faster while their blood pressure rises. These are not side effects that happen only in rare cases. They are common parts of the experience, and they are the reason health organisations warn that ayahuasca carries real risks, especially for people with certain health conditions or mental health problems.

It also matters that ayahuasca is illegal in many countries, including the United States and the United Kingdom, and that the brew is not made to a standard strength. One cup can be much stronger than another, even when it comes from the same place, because the plants vary and the preparation varies. That means a person cannot know in advance how strong the effect will be, and cannot control it once it has started. The experience cannot be switched off. A person has to wait for it to pass, and for some people those hours feel very long. If you are reading this because you are curious, the honest message from health guidance is simple: the risks to the brain and to mental health are real, they are not always predictable, and they are not removed by taking it in a calm place or with people who seem experienced.

What Ayahuasca Is and Why People Talk About It

Ayahuasca is traditionally made from two plants: a vine and a leaf. The vine contains compounds that stop the body from breaking down the active substance in the leaf too quickly, and the leaf contains a powerful hallucinogenic compound. Together, they produce an effect that neither plant would produce on its own in the same way. In traditional settings in the Amazon, the brew is used in ceremonies led by someone with long experience, and it has cultural and religious meaning for the communities that use it. That history is important to respect, but it does not make the brew safe for everyone, and it does not mean the same use in a different setting carries the same meaning or the same safety.

In recent years, ayahuasca retreats have grown in South America and in other parts of the world, and many people travel to them hoping for help with depression, anxiety, trauma or addiction, or hoping for a spiritual insight. Some small research studies have looked at whether ayahuasca could help with depression, and a few have found short-term improvements in mood for some people, but the research is still early, the studies are small, and the results are mixed. Health organisations do not recommend ayahuasca as a treatment, and they warn that the same brew that some people say helped them has caused serious harm to others. The gap between those two outcomes is part of what makes ayahuasca so hard to judge from stories alone, because the people who had a bad experience are less likely to write about it in glowing terms.

People also talk about ayahuasca because it is different from many other substances. It is not usually described as something people take to feel relaxed on a Friday night. It is described as intense, demanding and sometimes frightening, and that reputation attracts people who are looking for a deep change in their life. But intensity is not the same as safety, and a difficult experience is not the same as a healing one. A person can go through hours of fear, confusion and sickness and come out feeling worse, not better, and some people report that the distress stayed with them for weeks or months afterwards. That is why doctors and researchers keep saying the same thing: curiosity is understandable, but the brain effects are strong, the risks are real, and there is no reliable way to make the experience safe.

What Happens in the Brain During the Experience

When a person drinks ayahuasca, the active compounds reach the brain and affect the way brain cells communicate with each other. One of the main systems affected is the serotonin system, which helps to control mood, sleep, appetite and how we process information. Serotonin is a chemical messenger that the brain uses every day, and ayahuasca changes how it works in a strong and sudden way. The result is that the normal filters the brain uses to sort out what is important, what is real, and what can be ignored become much weaker. Sounds, colours, memories and feelings can all become more intense, and they can blend together in ways that feel strange and hard to describe.

That change in filtering helps to explain the hallucinations that many people report. A person may see shapes, patterns or scenes that are not there, or feel that time has slowed down or speeded up, or feel that their body has changed shape. They may also find that old memories come back very strongly, including painful ones, and that emotions they thought they had buried suddenly feel present and overwhelming. This is not like watching a film. It feels real while it is happening, and that is why it can be frightening. A person who is already anxious may become more anxious, and a person who is already low may feel worse during the experience, not better.

The brain also becomes less able to think in a clear, step-by-step way. Planning, checking facts, weighing risks and making decisions all become harder, because the parts of the brain that handle those jobs are working differently. A person may agree to something they would normally refuse, or fail to notice a danger, or be unable to explain what they need. That is one reason why being in a safe place with sober people matters, but even then, the person cannot think clearly enough to protect themselves in the way they normally would. The experience usually lasts for several hours, and during that time the person is vulnerable in a way that is hard to fully prepare for.

Thinking, Memory and Concentration Afterward

After the main effects wear off, many people feel tired, drained and muddled. They may find it hard to concentrate the next day, or to remember the details of what happened, or to follow a normal conversation. For most people, that fog lifts within a day or two, especially if they rest and sleep well, but for some people it lasts longer. They may feel spaced out, slow to think, or easily distracted for a week or more, and they may struggle at work or with study during that time. That is not unusual after a strong drug experience, but it is a real cost, and it is one that people often forget to count when they are thinking about whether to try ayahuasca.

Memory is affected in two ways. During the experience, short-term memory is often poor, which means a person may forget what was just said, or lose track of where they are, or repeat themselves without realising it. Afterwards, the memory of the experience itself is often patchy. Some parts feel very vivid, while other parts are blank, and the person may fill in the gaps without realising they are doing so. That can make it hard to know what really happened, and it can make it hard to learn from the experience in a clear way. People sometimes say they had a deep insight during the experience, but when they try to explain it later, the words do not quite work, and the insight fades.

Learning and concentration can also be affected for a while after the experience, especially if the person had a frightening or exhausting time. When the brain has been through hours of intense stimulation and strong emotion, it needs time to settle back to normal, and during that time, ordinary tasks can feel harder. A student may find it hard to revise, a worker may find it hard to focus on a task that needs care, and a parent may find it hard to keep track of the small details of family life. These effects are usually temporary, but they are a reminder that ayahuasca does not just affect a few hours of a person’s life. It can affect the days that follow as well.

Judgement, Mood and Seeing Things Differently

One of the most important brain effects of ayahuasca is the change in judgement. While the brew is active, a person is much less able to judge risk, to weigh consequences, or to make a careful decision. They may feel certain about something that is not true, or feel that a risky idea is safe, or agree to something they would normally think twice about. That loss of judgement is not a small detail. It affects safety, relationships and money, and it can lead to decisions that the person regrets when they are thinking clearly again. Health guidance stresses this point because it is easy to forget, when you are planning an experience in advance, that you will not be able to think clearly while it is happening.

Mood can also change in strong and unpredictable ways. Some people feel joy, peace or a sense of connection during the experience, and they describe it as one of the best moments of their life. Others feel fear, sadness, anger or shame, and they describe it as one of the worst. The same person can feel both in the same night, swinging from one extreme to the other in a short time. That is because the brew affects the brain’s mood systems very strongly, and it does not respect the person’s plans or hopes. A person who goes in hoping for calm may find themselves facing fear instead, and a person who goes in hoping for an answer may find themselves facing a painful memory instead.

There is also a change in how a person sees themselves and the world around them. Some people feel that their sense of self dissolves, or that they are connected to everything, or that they understand the world in a new way. These feelings can be powerful, and they can stay with a person afterwards, for better or for worse. Some people say the feeling helped them to see their life more clearly. Others say it left them confused about what is real, or made it hard to trust their own thoughts for a while afterwards. That confusion is not a sign that the person is weak. It is a sign that a powerful substance has changed how their brain works, and that the brain needs time to settle.

Anxiety, Fear and Difficult Experiences

Not every ayahuasca experience is pleasant, and health guidance is clear that difficult experiences are common. A person may feel intense fear, panic, or a sense that they are dying, or that they have lost their mind. They may see frightening images, or feel trapped, or feel that they cannot breathe properly. These feelings can be very distressing, and they can stay with a person after the experience has ended. Some people report flashbacks, which are sudden, unwanted returns of the images or feelings from the experience, days or weeks later. Others report that their anxiety got worse after ayahuasca, not better, and that they found it harder to relax or to sleep.

People with a history of mental health problems face a higher risk. Ayahuasca can trigger or worsen anxiety, depression, and in some cases, psychosis, which is a serious condition where a person loses touch with reality, hears voices, or holds beliefs that are not true. This risk is higher for people who have had psychosis before, or whose close family members have had it, but it can also happen to people with no previous history. A single experience can be enough to trigger a problem that lasts for weeks or months, and that needs medical help. That is why doctors advise people with mental health problems, or a family history of them, to avoid ayahuasca altogether.

The setting also matters, but it does not remove the risk. A calm room, a kind guide, and a quiet group can help a person feel safer, but they cannot stop the brew from affecting the brain, and they cannot stop a frightening experience from happening. A person who is already frightened can become more frightened, even in a good setting, and a person who feels safe at the start can still have a bad time. If a person does have a difficult experience, what helps most is having sober people nearby who can stay calm, keep the person safe, and get medical help quickly if it is needed. No ceremony, however well run, can guarantee that a difficult experience will not happen.

Longer-Term Strain on the Brain

The longer-term effects of ayahuasca on the brain are less well studied than the short-term effects, because most research has followed people for weeks or months, not for many years. What is known is that most people who use ayahuasca once or a few times do not show obvious permanent brain damage in the way that heavy alcohol use or repeated head injuries can cause. But that does not mean there are no longer-term risks. Some people report lasting changes in mood, anxiety, sleep and thinking after ayahuasca, and some report that they feel different in a way that is hard to describe, even months later. Researchers are still trying to understand how common these lasting effects are, and who is most likely to experience them.

One concern is that repeated use may make the brain more vulnerable over time. The serotonin system, which ayahuasca affects so strongly, is delicate, and repeated strong changes to it may leave a person more prone to low mood, anxiety or difficulty concentrating. Another concern is that a person who has had a frightening experience may develop a lasting fear of similar situations, or may avoid places or people that remind them of it. That is not brain damage in the physical sense, but it is a real and lasting effect on a person’s life, and it can affect work, relationships and daily happiness. Health guidance treats these outcomes seriously, even when they do not show up on a brain scan.

There is also the risk of a lasting mental health problem. A small number of people develop a longer period of psychosis, depression or anxiety after ayahuasca, and for them, the experience is not a one-night event. It becomes a longer problem that needs treatment and support. The risk is low for most people, but it is not zero, and it is higher for people who use ayahuasca often, who use it in large amounts, or who already have a mental health vulnerability. Because the brew is not standardised, and because research is still limited, no one can say in advance who will be affected. That uncertainty is itself a risk, and it is one of the main reasons health organisations advise caution.

Another longer-term question is how ayahuasca affects sleep and the daily rhythm of life. Sleep is when the brain sorts memories, clears away the strain of the day, and restores the ability to think clearly, and anything that disturbs sleep for weeks can affect mood and concentration in a real way. Some people report that after ayahuasca they found it harder to fall asleep, or woke often during the night, or had vivid and disturbing dreams that left them tired in the morning. Poor sleep on its own can make a person feel low, irritable and slow to think, and when it lasts, it can make other problems worse. That is why doctors ask about sleep when they are trying to understand a lasting change after a drug experience, and why they treat sleep as part of recovery, not as a separate issue. A person who is still sleeping badly weeks after ayahuasca should mention it to a health professional, because improving sleep is often one of the first steps towards feeling normal again.

It is also worth thinking about how a single intense experience can change a person’s relationships and daily habits over time. A person who has had a frightening experience may avoid talking about it, because they feel embarrassed or because they worry that others will judge them, and that silence can make the distress last longer. A person who has had a powerful positive experience may feel that ordinary life is dull by comparison, and may struggle to settle back into work, family routines and friendships. Neither outcome is a sign that the person is broken. Both are understandable reactions to an experience that was far stronger than everyday life, and both can be helped by talking honestly with someone who understands, whether that is a doctor, a counsellor, or a trusted friend. The brain does not recover in isolation. It recovers in the context of sleep, routine, support and time, and those ordinary things matter more than any single insight from one night.

Who Faces Higher Risk and What Warning Signs Mean

Some people face a much higher risk from ayahuasca than others, and it is important to know who they are. People with heart problems, high blood pressure, liver problems, or epilepsy are at higher risk, because ayahuasca raises heart rate and blood pressure and puts extra strain on the body. People who take certain medicines, including many antidepressants and other drugs that affect serotonin, face a serious risk of a dangerous reaction called serotonin syndrome, which can cause confusion, high temperature, muscle stiffness and seizures, and can be life-threatening. People who are pregnant, or who have a history of psychosis or bipolar disorder, are also advised to avoid ayahuasca completely. These are not minor cautions. They are the groups that health guidance names again and again.

Warning signs during or after an experience should be taken seriously. Confusion that does not lift, hearing voices, holding beliefs that are clearly not true, severe anxiety or panic that does not settle, chest pain, very fast heartbeat, high fever, severe vomiting that does not stop, or thoughts of harming yourself are all reasons to seek medical help urgently. These are not signs to wait out or to handle alone. A person who is still confused or distressed days after an experience, or who cannot sleep, eat or work normally, should also seek help, and should tell the doctor or health professional what they took and when. That information helps the professional to give the right care, and it is not a reason for judgement.

It is also worth saying plainly that ayahuasca is not a treatment for depression, anxiety, trauma or addiction, even though some people say it helped them. There is early research, but it is not enough to recommend it, and the risks are not small. A person who is struggling with their mental health deserves safe, proven help, and there are treatments and support services that have been tested properly and that do not carry the same risks. If you are thinking about ayahuasca because you are struggling, the safer step is to talk to a doctor or a mental health professional first, and to ask about the options that are available. That conversation may not feel as exciting as a retreat, but it is far safer, and it is much more likely to help in the long run.

My Take:

I will be honest with you about ayahuasca, because I think the conversation around it is often too one-sided. On one side, you hear people talking about it as if it were a miracle, a shortcut to healing, or a spiritual gift that will change your life in one night. On the other side, you hear people talking about it as if it were only danger, with no room for the fact that some people do say it helped them. I think both sides miss something. The truth, as I see it, is that ayahuasca is a powerful substance that changes the brain in a strong and unpredictable way, and that power is exactly why it can feel meaningful to some people and harmful to others. Power is not the same as safety, and a powerful experience is not the same as a safe one.

What worries me most is the way ayahuasca is sold to people who are already struggling. If you are living with depression, anxiety, trauma or addiction, you are in pain, and you want something that works, and you want it to work soon. Then someone tells you about a brew in the jungle that will heal you in a weekend, and it sounds like hope. I understand why that is tempting, and I do not blame anyone for being tempted. But I think it is unfair to sell hope in that way, because the evidence is thin, the risks are real, and the people who are most desperate are also the people who are most vulnerable to harm. A person who is already low does not need a frightening experience on top of their pain. They need steady, proven help, and they need people who will stay with them while they get better, not just for one night.

I also think about the brain effects, because they are the part that people underestimate. When you drink ayahuasca, you are not just having a strange evening. You are changing how your brain sorts information, how it handles memory, how it judges risk, and how it manages mood, all at once, for several hours. That is a lot to ask of the brain, and it is not surprising that some people come out of it feeling muddled, anxious or confused for days afterwards. I think we should talk about that more plainly, because when people only hear about visions and insights, they do not prepare for the confusion, the fear, or the days of feeling foggy afterwards. And when those things happen, they can feel alone, as if something has gone wrong with them, when in fact it is a known effect of a powerful substance.

The judgement problem is the one I keep coming back to. While ayahuasca is active, you cannot think clearly, you cannot weigh risks properly, and you cannot make a careful decision. That is not a small detail. It means you are trusting other people with your safety at a time when you cannot protect yourself, and that trust is only as good as the people around you. I have read too many stories of people who were in places that looked safe and turned out not to be, or who were with people who seemed experienced and turned out not to know what to do when something went wrong. A good setting helps, but it does not make you safe, because the brew itself takes away your ability to judge. That is a hard truth, and I think it should be said more often.

I am also troubled by the way the risks to mental health are sometimes played down. People say that ayahuasca is natural, as if natural meant safe, but many natural things are dangerous, and ayahuasca is one of them. People say that it has been used for centuries, as if that meant it was safe for everyone, but traditional use is not the same as modern retreat use, and it does not remove the risk for a person with a history of psychosis, or a person taking antidepressants, or a person with a heart condition. I think the word natural is used to make people feel safe, and that worries me, because it stops people from asking the hard questions they should ask before they take something this strong.

The stories that stay with me are not the stories of visions. They are the stories of people who had a frightening experience and then felt anxious for months, or who heard voices after ayahuasca and needed months of treatment, or who went looking for healing and came back feeling worse. Those stories are less likely to be shared on social media, because they are painful and private, but they are real, and they matter. I think we should listen to them as carefully as we listen to the stories of healing, because they tell us something important: that the same brew can help one person and harm another, and that no one can know in advance which outcome they will get. That uncertainty is not a small risk. It is the risk.

I do not think people who are curious about ayahuasca are foolish. Curiosity is human, and the desire to understand yourself better is a good desire. But I think curiosity should be paired with honesty, and honesty means saying that ayahuasca is illegal in many places, that it is not standardised, that it can trigger lasting mental health problems, that it can interact dangerously with medicines, and that it can put a strain on the heart. If you still want to learn about yourself after hearing all of that, there are safer ways to do it. Talking to a therapist, learning to meditate, spending time in nature, or joining a support group will not give you visions, but they will not put your brain and your heart at risk either, and they will still be there for you the next day, and the day after that.

Money is part of this too, and I think it should be named. Ayahuasca retreats are expensive, and some of them cost thousands of pounds or dollars, and that money is often spent by people who are already struggling. I think about what that money could have bought instead: months of therapy, or help with a practical problem that is causing stress, or time off work to rest properly. I am not saying that money is the most important thing, but I am saying that when someone is selling you a powerful experience at a high price, you should ask who benefits, and whether the benefit is really yours. A retreat that charges a lot of money has a reason to tell you that the experience will change your life, and that reason is not always your wellbeing.

If someone I cared about asked me about ayahuasca, I would not lecture them, and I would not judge them. I would ask them what they are hoping for, and I would listen, because the hope usually tells you what the real problem is. If they are hoping for relief from depression, I would say that there are safer treatments, and that a doctor can help them find one. If they are hoping for a spiritual experience, I would say that there are many ways to seek that, and most of them do not involve a substance that can trigger psychosis. If they are hoping to understand a painful memory, I would say that a therapist can help them to do that slowly and safely, without the fear and confusion that ayahuasca brings. I would not pretend that those safer options are as dramatic as a night in the jungle, but I would say that drama is not the same as healing.

I also think about the people who run retreats, because not all of them are the same. Some are sincere, and some are careful, and some have spent years learning the traditions they work with. Others are not, and they are running a business, and they may not have the medical knowledge to keep people safe, or the willingness to turn away someone who should not take ayahuasca. A person who is thinking about a retreat should ask hard questions: who is in charge, what medical training do they have, what happens if someone becomes very ill, and what happens if someone has a mental health crisis afterwards. If the answers are vague, or if the person is told not to worry, that is a warning sign, and it should be taken seriously.

The point I want to leave you with is simple. Ayahuasca changes the brain strongly, it changes thinking, memory, mood and judgement, it can cause fear and confusion that lasts, and it can trigger lasting mental health problems, especially for people who are already vulnerable. Some people say it helped them, and I believe them, but their good experience does not make it safe for you, and it does not remove the risks. If you are struggling, please seek help that is proven and safe, and please talk to a health professional before you consider anything as powerful as ayahuasca. Your brain is the part of you that lets you think, remember, love and make decisions. It deserves to be protected, not put at risk for one night, however promising that night sounds.

Finally, I want to say something to anyone who has already tried ayahuasca and is still feeling unwell afterwards. If you are still anxious, still confused, still hearing or seeing things that are not there, or still struggling to sleep or to think clearly, please do not suffer in silence. Tell a doctor what happened, and tell them when it happened, because that information will help them to help you. You are not weak for feeling unwell, and you are not alone. Many people have had difficult experiences with ayahuasca, and many of them have recovered with the right support. The brave step is not to take a powerful brew. The brave step is to ask for help when you need it, and to keep asking until you get it. That is the step I would want for anyone I care about, and it is the step I would want for you.

I also want to be clear about what I am not saying. I am not saying that every person who tries ayahuasca will be harmed, because that is not true, and I do not want to replace one exaggeration with another. Some people take it once, feel tired for a day, and then feel fine, and they move on with their lives. I believe those accounts too. What I am saying is that the harm, when it happens, can be serious, that it cannot be predicted in advance, and that the people most likely to be harmed are often the people who are already struggling and hoping for help. That combination, a real risk plus an unpredictable outcome plus a vulnerable person, is what makes me cautious, and it is what makes me want the full picture to be shared, not just the best stories.

If you take one idea from this article, I hope it is this: your brain is not a machine you can switch off and on without cost. It is the part of you that holds your memories, your judgement, your mood and your sense of who you are, and it works best when it is treated with care, rest and time. A single night of intense change can leave it unsettled for days, weeks or longer, and no vision, however beautiful, is worth a lasting loss of clear thinking or peace of mind. There are slower, safer ways to understand yourself, and they may not sound dramatic, but they are honest, they are proven, and they will still be there for you tomorrow. Please choose the path that protects your mind, not the one that puts it at risk.

Frequently Asked Questions

How long do Ayahuasca brain effects last?

The strongest effects usually last for several hours, and most people feel back to normal within a day or two, although they may feel tired and muddled the next day. Some people feel spaced out, anxious or slow to think for a week or longer, especially after a frightening or exhausting experience. In a small number of cases, anxiety, low mood or confusion can last for weeks or months, and that needs medical help. How long the effects last depends on the person, the strength of the brew, their health, and whether they have a mental health vulnerability, so there is no single answer that fits everyone.

Can Ayahuasca change the way you think?

Yes, ayahuasca can change the way you think, both during the experience and afterwards. While it is active, it changes how the brain sorts information, so thoughts can feel more intense, less logical, and harder to control, and it can be difficult to tell what is real from what is imagined. Afterwards, some people say they see their life differently, while others say they feel confused or find it hard to trust their own thoughts for a while. These changes are usually temporary, but for some people, especially those with a mental health vulnerability, the change in thinking can last longer and may need professional help.

Can Ayahuasca affect memory and learning?

Yes, ayahuasca can affect memory and learning. During the experience, short-term memory is often poor, so a person may forget what was just said or lose track of where they are. Afterwards, the memory of the experience is often patchy, with some parts vivid and others blank, and concentration can feel weaker for a few days. Learning new things may feel harder while the brain is still settling. For most people, memory and concentration return to normal within days, but a frightening experience or a lasting mental health problem can make the difficulty last longer.

Why does Ayahuasca make it hard to focus?

Ayahuasca makes it hard to focus because it changes how the brain filters information and manages attention. During the experience, the brain is flooded with intense sights, sounds, memories and emotions, and it becomes much harder to pay attention to one thing at a time. Afterwards, tiredness, poor sleep and the emotional strain of the experience can also make concentration feel weaker. The brain needs time to settle back to its normal way of working, and until it does, ordinary tasks that need care and attention can feel harder than usual.

Does Ayahuasca damage the brain permanently?

There is no clear evidence that a single use of ayahuasca causes permanent physical brain damage in most people, but the research is still limited and the longer-term effects are not fully understood. What is clear is that ayahuasca can trigger lasting mental health problems, such as prolonged anxiety, depression or psychosis, in some people, and those problems can affect thinking and daily life for a long time. Repeated use may also make the brain more vulnerable over time. Because the risks are not fully known and cannot be predicted for an individual, health guidance advises caution rather than assuming the brew is harmless.

Does Ayahuasca change judgement and decisions?

Yes, ayahuasca changes judgement and decisions strongly while it is active. The parts of the brain that help a person to weigh risks, check facts and think through consequences work differently under its influence, so a person may feel certain about things that are not true, agree to things they would normally refuse, or fail to notice a danger. That loss of judgement is one of the main safety risks, because the person cannot protect themselves in the normal way. Judgement usually returns as the effects wear off, but decisions made during the experience can have lasting consequences.