LSD and psychedelics: a breakthrough in ADHD treatment or an illusion?

A recent review published in the International Journal of Molecular Sciences has turned the spotlight on a surprising possibility: psychedelics

by Maria Rita Montebelli

20 May 2026

4' min read

Translated by AI

Versione italiana

Key points

Why LSD and psilocybin come into the picture
The 'mental noise' of ADHD
The ambiguous results of the most rigorous studies
How I make your brain more "plastic"

4' min read

Translated by AI

Versione italiana

Everyone knows it by its acronym, ADHD, and its full name, Attention Deficit Hyperactivity Disorder, encapsulates some of the salient features of this condition. But it is also true that reducing ADHD to simple distraction or hyperactivity is a big mistake. More and more neuroscientists describe it as a complex disorder of mental regulation: a brain that struggles to manage attention, impulses, motivation in a stable and productive way. And it can affect children as well as adults.

The available therapies also have obvious limitations. Today, treatment is mainly based on drugs such as Ritalin, together with cognitive-behavioural psychotherapy and psycho-educational courses. But research is already looking further afield. And a recent review published in the International Journal of Molecular Sciences has turned the spotlight on a surprising possibility: psychedelics.

Why LSD and psilocybin come into the picture

For years, ADHD experts have focused on dopamine and noradrenaline, the neurotransmitters that help the brain maintain concentration, self-control and continuity in daily activities. When these systems malfunction, symptoms very familiar to those living with ADHD appear: mind wandering here and there constantly, difficulty concentrating, constant search for immediate stimuli and enormous fatigue in performing repetitive or unrewarding activities.

In recent years, however, researchers have also begun to focus on another possible player: serotonin. And this is where LSD, psilocybin and ayahuasca come in.

Yes, the very substances associated with the psychedelic culture that influenced artists and music icons, from The Beatles to Pink Floyd, all the way to Steve Jobs (who certainly wasn't a musician), who called LSD one of the most important experiences of his life.

The 'mental noise' of ADHD

These substances act on specific serotonin receptors and appear to temporarily alter the way different areas of the brain communicate with each other.

One of the main targets of psychedelics is the so-called Default Mode Network, the brain network that is activated when the mind wanders aimlessly and is the basis of the so-called inner dialogue, of automatic thoughts (those that bubble up from the mind like bubbles on the surface of water), of continuous mental flow.

According to some research, in people with ADHD this network may be too intrusive, making it difficult to switch off the internal 'background noise' to focus on the outside world.

Instead, psychedelics seem to be able, at least temporarily, to reduce the activity of this network and increase communication between areas involved in attention and cognitive control. Some neuroscientists even attribute to these substances the ability to operate a kind of brain 'reset'.

The microdosing of psychedelic substances: a new therapeutic frontier?

This gave rise to the idea of microdosing: the administration of very low doses of LSD or psilocybin, too small to cause true hallucinations but, at least in theory, sufficient to improve concentration, creativity and productivity.

And on the net, it is all a florilege of enthusiastic accounts, especially among professionals, students and people with ADHD. Microdosing on psychedelics would give its users greater lucidity and motivation, reducing mental chaos.

The ambiguous results of the most rigorous studies

But is all that glitters in social media and blogs really all that glitters? When science has tried to verify these effects with its own rigorous instruments, enthusiasm has died down somewhat and the overall picture has become much more uncertain.

The most rigorous studies have produced ambiguous results. And in controlled research, those who take microdoses of psychedelics often improve in the same way as those who take a placebo (a prime example of the placebo effect, indeed).

This means that expectations, enthusiasm, autosuggestion and changes in lifestyle could explain an important part of the 'perceived' benefits of taking psychedelics.

In other words, online testimonials are one thing, but they are certainly not enough to prove that psychedelics really work against the main symptoms of ADHD.

How I make your brain more 'plastic'

Yet scientific interest in psychedelics remains very high, especially for another possible effect of these substances: neuroplasticity.

In the laboratory, LSD and its companions appear to promote the formation of new connections between neurons, making the brain temporarily more flexible and adaptable, more 'plastic' in fact. This is why some researchers consider psychedelics to be 'psychoplastogens', substances capable of promoting brain remodelling.

And so the resulting hypothesis is fascinating: psychedelics cannot directly 'cure' ADHD, but perhaps they could help the brain break out of rigid mental patterns, improving emotional regulation, learning and adaptation.

Of course, even this hypothesis remains to be tested and researchers urge caution. The available evidence is still limited, many studies are carried out on only a few participants and are often based on subjective accounts. And, as we have seen, when experiments become really rigorous, the effects of psychedelics tend to diminish.

For now, therefore, LSD, psilocybin and ayahuasca should not be considered validated therapies for ADHD. However, they remain one of the most fascinating frontiers of contemporary neuroscience: a huge open laboratory on how the brain regulates attention, emotions and consciousness.