Does ADHD Therapy Last? What an Eight-Year Follow-Up Can and Cannot Tell Us
The question behind the question
If you have ADHD, you may have wondered whether therapy creates lasting change: or whether the benefits disappear as soon as the sessions end.
It is an understandable concern. ADHD affects attention, working memory, planning and task initiation across the changing landscape of everyday life. A strategy may work beautifully in one season, then become harder to access when sleep deteriorates, demands increase or stress pushes your nervous system beyond capacity.
A newly published Japanese follow-up study offers a rare opportunity to examine what happened eight years after a randomised trial of group cognitive behavioural therapy (CBT) for adults with ADHD. Its findings are encouraging in one narrow area, but they do not justify sweeping promises.
The most accurate answer is this:
CBT may support lasting improvement in inattentive symptoms for some adults with ADHD, but this study is preliminary, exploratory and far too small to prove a universal long-term effect.
That distinction matters. Evidence should offer hope without becoming another source of pressure.
What did the eight-year study examine?
Nakashima and colleagues (2026) followed 48 adults recruited from outpatient clinics across Japan. Participants had a mean age of approximately 39 years, and 87% were female.
They were randomised to one of two groups:
Group CBT plus treatment as usual (CBT + TAU)
Treatment as usual alone (TAU)
“Treatment as usual” refers to the ordinary care participants were receiving within the study context. The paper does not establish that every participant received the same medication or psychological support, so TAU should not be interpreted as a single uniform treatment.
At the five-year point, participants originally allocated to CBT + TAU were offered an optional digital booster. This was not a new randomised comparison. Participation was voluntary and therefore non-randomised: some people accepted it and others did not.
At eight years, only 24 participants completed the assessments:
14 from the CBT + TAU group
10 from the TAU group
50% of the original sample
The researchers assessed:
CAARS Inattention/Memory, the primary outcome
ADHD symptoms
Anxiety
Depression
Functioning
Time management
The long follow-up is valuable because eight-year psychological-treatment data are unusual. Nevertheless, the very small endpoint sample creates a substantial statistical and interpretive problem.
What did the researchers find?
1. The clearest signal concerned inattentive symptoms
At eight years, the CBT + TAU group showed nominally lower CAARS Inattention/Memory problems than the TAU group:
p = .038
Cohen’s d = −.65
This effect size is not trivial. However, the result was not robust to multiple imputation, a statistical method used to examine how missing data may influence the conclusions.
In practical terms, the finding appeared in the completer analysis but became less secure when the researchers accounted for participants who did not complete the eight-year assessment.
A second measure produced a more persistent signal. DSM inattentive symptoms favoured the CBT + TAU group:
p = .025
partial η² = .09
This finding survived imputation. Bayesian analyses also provided further support for the inattentive-symptom result.
The cautious interpretation is therefore not “CBT permanently treats ADHD”. It is:
Some participants who received group CBT showed fewer inattentive symptoms eight years later, and this particular finding remained supported under additional analyses.
2. Individual improvement was not universal
Among the 24 completers:
6 of 14 CBT + TAU participants (43%) showed reliable improvement in self-reported inattention/memory
1 of 10 TAU participants (10%) showed reliable improvement
However, there is an important detail. All six CBT + TAU improvers belonged to the optional digital booster subgroup.
This is interesting: but it does not prove that the booster caused the improvement. Booster uptake was non-randomised, and people who chose to engage may have differed from those who did not in motivation, access, stability, resources or other ways the study could not fully disentangle.
The result is best treated as a hypothesis for future research, not as evidence that a digital booster independently produces eight-year benefits.
3. No adverse events were recorded
The study reported no adverse events during the follow-up. This is reassuring, although a small sample and high attrition mean that safety findings should also be interpreted within the limits of the available data.
What the study can: and cannot: tell us
The study can suggest | The study cannot prove |
Group CBT may be associated with lasting improvement in inattentive symptoms for some adults with ADHD. | That CBT produces lasting benefit for every adult with ADHD. |
A structured intervention may have effects that remain detectable years later. | That therapy alone changes the underlying neurodevelopmental basis of ADHD. |
Ongoing support deserves further investigation. | That the optional digital booster caused the observed improvements. |
An eight-year follow-up is a valuable longitudinal window. | That the findings apply equally across genders, cultures, ages or clinical settings. |
Inattention was the strongest signal in this paper. | That the study establishes lasting effects on anxiety, depression, broad functioning or time management. |
Several limitations are especially important:
The endpoint sample was very small.
Half of the original participants were not retained at eight years.
Reported statistical power at the endpoint was limited: power = .45.
The digital booster was not randomly allocated.
Outcomes relied heavily on self-report.
The sample was predominantly female and recruited in Japan, which limits generalisability to other populations, including people receiving care in the UK.
Accordingly, the authors describe the findings as preliminary, exploratory and hypothesis-generating. Larger studies with better retention and more diverse samples are needed.
Why therapy may be a process rather than a quick fix
ADHD therapy is not a single motivational speech delivered to an allegedly unmotivated brain. It is more like gradually redesigning an operating system while the computer is still running.
CBT may help some people notice the cycles that maintain difficulty: for example:
underestimating how long a task will take;
avoiding a task because it feels cognitively overwhelming;
interpreting missed deadlines as evidence of personal failure;
waiting for urgency, fear or intense interest to generate action;
losing a routine when one part of the routine breaks.
A structured intervention may then support experiments with:
planning and prioritisation;
task initiation;
time awareness;
breaking large demands into visible steps;
reviewing what worked rather than relying on self-criticism;
building external reminders and environmental scaffolding.
Nevertheless, this particular study does not prove lasting effects on every one of these skills. It measured several outcomes, but its strongest and most defensible signal concerned inattentive symptoms.
The therapeutic shift is from intensity to consistency. You do not need to feel transformed after every session. You may instead be learning to return, review, adapt and practise: especially when life becomes unpredictable.
How to review whether therapy is helping
If you are already in therapy, or considering it, progress does not have to be judged by a vague question such as “Am I fixed yet?”
Instead, consider asking:
A practical micro-step: Name–Normalise–Redirect
The Name–Normalise–Redirect framework was developed by Dr Danielle Baillieu. It is presented here as a practical micro-step, not as an established treatment protocol.
When an ADHD-related difficulty appears, try:
The redirect might be opening the document, putting the shoes by the door, writing one sentence or setting a five-minute timer. The goal is not to manufacture heroic motivation. It is to create a bridge between intention and action.
Small steps can feel unimpressive. They are still steps.
The balanced conclusion
This eight-year follow-up offers something genuinely valuable: a glimpse of what may happen long after a structured CBT intervention has ended.
It also gives us a necessary lesson in scientific humility. With 24 completers, 50% attrition, limited endpoint power, non-random booster uptake and a predominantly female Japanese sample, the findings cannot establish that CBT reliably produces lasting benefit for all adults with ADHD.
What they can do is encourage better questions:
Which therapy components endure?
Who benefits most?
What makes skills accessible under stress?
Do booster sessions help, and for whom?
How should progress be measured beyond symptom scores?
How can treatment remain adaptable across changing environments?
For now, therapy is best understood as a process of learning, externalising, practising and revising. It may not erase every difficulty. It may help you build a more forgiving and functional way of responding when those difficulties arise.
Compassionate Final Note
If therapy has not felt transformative, that does not mean you have failed: or that change is impossible. Fit, accessibility, timing, health, environment and therapeutic relationship all matter.
And if therapy has helped, you do not have to maintain progress through constant intensity. Sustainable change is often built through repetition, support and compassionate return.
You are not a problem to be solved once. You are a person learning what helps your mind function with less shame and more support.
Urgent support in the UK
This article is educational and is not a diagnosis or a substitute for individualised psychological or medical care.
If you or someone else is in immediate danger, call 999 or go to A&E. In England, you can contact NHS 111 and select option 2 for urgent mental-health support. You can also contact Samaritans on 116 123. Parents and carers seeking support for a young person can contact the YoungMinds Parents Helpline.
For information about therapy and neurodiversity support, you can explore the Life Changes 4 Good neurodiversity resources or therapy services.
References
Nakashima, M., López-Pinar, C., Yoshihara, S., Inada, N., Tanigawa, Y., Yamashita, M., Maeda, E., Kouguchi, M., Yano, H., Ikari, K., Kuga, H., Oribe, N., Kaname, H., Harada, T., Ueno, T., & Kuroki, T. (2026). Long-term effects of cognitive-behavioral therapy for adults with ADHD: results from an 8-year randomized controlled trial follow-up. Scientific Reports. https://doi.org/10.1038/s41598-026-68665-6
Trial registration: UMIN000026916, registered 9 April 2017.
Life Changes 4 Good Consulting: Dr Danielle Baillieu Website: lifechanges4good.com Email: dr.danielle@Lifechanges4good.com
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