Page last updated Monday 29th Jun 2026
Page written by Victoria McCann

Some people use a substance to quiet racing and loud thoughts. Others use stimulants to get through the day, feeling like they just don’t have enough energy without them. Some have been taking a substance to manage symptoms of ADHD, without knowing that’s what they were doing.

This is why special attention needs to be paid to the relationship between ADHD and addiction. The two overlap more often than most treatment programmes recognise, and we treat both with the passion and care they need.


When ADHD and addiction overlap

Both ADHD and addiction involve the same part of the brain, which is the system that manages reward and motivation. In ADHD, this system functions differently, making it harder to tolerate delayed rewards and regulate impulses. Research published in Frontiers in Psychiatry found that this shared neurological basis gives people with ADHD a significantly higher risk of developing addiction disorders.

At Castle Health, we offer dual diagnosis treatment across outpatient clinics in the UK, Ireland, and Europe, and through residential care at Castle Craig and Smarmore Castle. We treat addiction and work alongside co-occurring ADHD throughout. Our psychiatrists do not provide formal ADHD assessments or diagnoses. We refer those externally, and we will tell you that clearly from the start.


“I contacted Castle Health [formerly CATCH Recovery] seeking guidance and options to support a relative who was having a difficult time both with addiction and other mental health concerns. The team were incredibly kind and informed, they took the time to go through all the options with me and helped us plan how to approach the matter. Fortunately the person has now been receiving care from Castle Health for several months and is doing really well. A big thank you to the wonderful team. I would highly recommend this service.”

– Wendy O’Brien, relative of a patient

ADHD and addiction: understanding your treatment options

The relationship between addiction and ADHD runs deeper than two conditions happening to coincide. Research published in Frontiers in Psychiatry found that people with ADHD face a significantly increased risk of developing addiction disorders. American research published in the Journal of Clinical Psychiatry estimated that up to 50% of adults with substance use disorders have a lifetime diagnosis of ADHD. When one condition goes unaddressed, the other becomes harder to treat. That’s not a personal failure. It’s neurology.

Self-medication sits at the centre of this. Substances can temporarily reduce ADHD symptoms, like restlessness and difficulty coming down from overstimulation. They might work in the short term. 

Yet research into drug addiction and ADHD consistently shows the same pattern across age groups. A study published in Postgraduate Medicine confirmed that adolescents and young adults with substance use disorders are significantly more likely to have ADHD than the general population. Treating the substance use without addressing the ADHD piece rarely holds for long. But treating ADHD without acknowledging the substance use does not hold either.

The connection between addiction and neurodiversity is increasingly recognised in clinical research. ADHD is a neurodevelopmental condition, not a character trait, and treatment needs to reflect that. Our dual diagnosis treatment is built around both.

Outpatient treatment for ADHD and addiction

For most people seeking help with ADHD and addiction, outpatient treatment is the right starting point. Through our outpatient programmes, Castle Health provides in-person sessions across clinics in the UK, Ireland, and Europe, structured around your schedule.

When ADHD is part of the clinical picture, consistency and pace matter more, not less. Our approach is built around that. Sessions are designed to work with attention patterns, rather than against them. You stay connected to your daily life. The clinical work is substantial.

Online treatment for ADHD and addiction

If attending a clinic regularly isn’t practical, online treatment runs to the same clinical standard through secure video sessions. For people with ADHD, removing the logistical and transitional demands of regular travel can make sustained engagement more achievable.

Sessions are clinician-led and structured. Online treatment works best when there is a reliable routine around it. Our team will help you build that routine from the start.

Inpatient treatment for ADHD and addiction

When the level of need calls for a more intensive setting, Castle Craig Hospital in Scotland and Smarmore Castle in Ireland offer residential treatment programmes. Inpatient care is the right level of support when outpatient structure hasn’t been enough.

Both settings have extensive experience with dual diagnosis, including ADHD and addiction. Research published in the Journal of the American Academy of Child and Adolescent Psychiatry found that the risk of substance use disorders is twice as high in people with ADHD, and four times as high when ADHD co-occurs with conduct disorder. The residential setting provides round-the-clock clinical presence and the structure that comes with that.

Medically managed detox

Some substances cannot be stopped without medical supervision. Alcohol, benzodiazepines, and opioids carry withdrawal risks that cannot safely be managed at home. The US National Library of Medicine sets out the key timelines, stating that short-acting opioid withdrawal typically begins within 8 to 24 hours of the last dose and can continue for up to 10 days. Benzodiazepine withdrawal generally begins within one to seven days and may continue for two to eight weeks or longer, depending on the medication involved.

Cocaine does not typically produce visible physical withdrawal symptoms. But MedlinePlus, the US National Library of Medicine’s health information service, documents the significant psychological effects that can follow stopping. These are intense cravings, depressed mood, anxiety, fatigue, and, in some cases, suicidal thoughts. These can be severe, even without the physical symptoms associated with alcohol or opioid withdrawal.

If you are entering treatment with substances that require a medically managed detox, we will tell you that clearly at the start. We will not recommend beginning therapy before it is clinically safe to do so.

Therapies for ADHD and addiction

Structured psychological treatment is central to managing ADHD and addiction together. Research published in Primary Psychiatry identifies structured behavioural strategies as central to treatment for adults with ADHD. This can help people to understand how the condition affects their daily functioning and develop practical coping strategies.

Research published in Behaviour Research and Therapy found that Cognitive Behavioural Therapy (CBT) reduces symptoms of adult ADHD, with modified approaches, like structured skills training,  producing measurable symptom reduction.

Dialectical Behaviour Therapy (DBT), individual therapy, group therapy, and family therapy are all part of the Castle Health offering. These therapies work better when adapted for how an ADHD brain actually engages with sessions. Pacing, structure, and working with stimulation patterns rather than against them are not accommodations. They are good clinical practice for this population.

What to expect from ADHD and addiction treatment with Castle Health

addiction together produces better outcomes than treating either in isolation. Addiction and mental health conditions rarely exist in isolation, which is why our approach to dual diagnosis treats both with equal clinical weight.

Published research on ADHD pharmacotherapy and substance use treatment found that medication alone is not particularly effective where active substance use is present alongside ADHD, and that structured therapies are among the most effective approaches for this group. We don’t offer a generic dual diagnosis programme with a new label. We work with your whole picture.

Man reflecting by a lake at sunset, representing relapse in addiction recovery.
Your first conversation with our team

When you first get in touch, you’ll speak with our team confidentially. There’s no pressure to commit to anything in that first conversation. We will listen to what you are experiencing, explain the options that are relevant to your situation, and be clear about what we do and do not offer.

Formal ADHD assessment

If you need a formal ADHD assessment or diagnosis, we will refer you to an appropriate external psychiatrist and explain how that fits with starting treatment. Our psychiatrists do not provide standalone ADHD assessments. Most providers in this sector aren’t clear about what they offer and what they don’t. We are. Knowing what we offer, and what we do not, helps you make an informed decision.

Recommended treatment for dual diagnosis

If your use of alcohol or other substances requires a medically managed detox before therapy can begin, we will explain that at the start. We won’t recommend beginning therapy where it is not yet clinically safe. You can read more about patterns of alcohol use in ADHD on our alcohol page.

Recovery from a dual diagnosis is rarely linear. It is not a programme you complete and then move on from. Our model includes ongoing aftercare and recovery support because the evidence supports longer engagement, and because the challenges of ADHD do not disappear when primary treatment ends.

If someone in your life is dealing with ADHD and addiction

When someone you know has both ADHD and a difficult relationship with substances, it can be hard to make sense of what you are seeing. Which came first? Has one condition been making the other worse? These are questions families and partners often sit with for a long time before anything changes. Not finding a clear answer is common, as dual diagnosis presents in ways that are difficult to read from the outside.

What people in this situation often describe is an oscillation between wanting to help, not knowing how, and feeling worn down by the uncertainty. An international study published in the International Journal of Methods in Psychiatric Research surveyed 3,558 people across 10 countries in substance use treatment and found that 40% screened positive for ADHD. Most had never been diagnosed. You may have been trying to understand a pattern for years that had a clinical name and a clinical explanation the whole time.

Talking to someone in your life about getting help needs to meet them where they are. Our family therapists have experience working with exactly this dynamic, not only supporting the person in treatment, but helping families understand what they have been carrying and what practical next steps look like.

ADHD and alcohol addiction have a particularly well-documented relationship. Understanding patterns of alcohol use in ADHD can help you get a clearer picture of the relationship between the two conditions. Our team also works with families on intervention approaches. If the person in your life is not yet ready to seek help, there are still useful steps available. Family therapy and couples therapy are both part of our offering.

Our model includes ongoing aftercare and recovery support for families and partners who want to stay connected beyond the primary treatment phase. Recovery doesn’t end at discharge, and our support doesn’t either.

A therapist and a patient discussing the patient's addiction to legal drugs
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Speak to our team confidentially

If something on this page describes a pattern you recognise, in your own life or someone else’s, you can speak to our team without any obligation. We’ll help you work out the right next step. That might be treatment with us, or it might not. Either way, the conversation is a useful place to start.

Get help today

Take the first step in your recovery journey

We are here to listen, guide and help you every step of the way. Call us today and together we can find a solution that suits you.

Our admissions process is confidential and designed to suit and support you and your circumstances. Find out more about the Admissions process.

Telephone

From the UK: 020 3098 2503
International: +44 (20) 3098 2503


Frequently asked questions about ADHD and addiction

Can I keep taking my ADHD medication during addiction treatment?

In most cases, yes. Your medication will be reviewed as part of your assessment. Our clinical team will work with you and, where appropriate, with your prescribing psychiatrist to ensure your ADHD is managed safely throughout treatment. We don’t make changes to your medication without your knowledge and involvement.

Do I need a formal ADHD diagnosis before starting addiction treatment with Castle Health?

No. Many people who come to us with a suspected ADHD and addiction presentation have never received a formal diagnosis. You can begin treatment without one. If a formal assessment would be clinically useful, we will refer you to an external psychiatrist and explain how that fits with your treatment plan.

What if I’m not sure whether the ADHD or the substance use came first?

You don’t need to know. Most people cannot say with certainty, and clinically it matters less than addressing both together. Our assessment will give us a clearer picture of your history and what treatment looks like for you specifically.

How much does private dual diagnosis treatment cost?

Costs depend on the type and length of treatment. Please contact our team directly for a clear breakdown based on your situation. We will give you a straightforward answer with no obligation to proceed.

Is treatment for ADHD and addiction available on the NHS?

Yes, though pathways and waiting times vary. If you are weighing up your options, our team can explain the differences between NHS and private care clearly and without pressure. We are happy to help you work out the right route, even if that turns out not to be with us.