Dual diagnosis (addiction with mental illness)

What is dual diagnosis?

Dual diagnosis (also called co-occurring disorders) means having a mental illness and a problem with drugs, alcohol or sometimes a behaviour such as gambling, at the same time. This is very common: a large proportion of people using drug and alcohol services also have a mental health condition, and the two often feed into each other.

The key message is simple: the two problems should be treated together, not one after the other or in separate places. In the past, people were sometimes bounced between mental health services and addiction services, each saying the other should treat them first. UK guidance (NICE) is clear that mental health services should not turn someone away because they also use substances, and that care should be joined up around the person.

Dual diagnosis can make each condition harder to treat, but it is treatable. With coordinated, non-judgemental care and a clear plan, many people make real progress. Free help is available, and you should not have to choose which problem to get help with.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Treating problems separately versus together

UK guidance favours treating both together. If you are told to sort out one problem before another service will help, that is a sign care is not joined up as it should be.

Preparing for your treatment

• Be honest about both your mental health and your drug, alcohol or behavioural use; staff need the full picture and will not judge you.
• Bring a list of all your medicines, including anything prescribed for mental health, and any you have stopped.
• Note your symptoms and how mood and substance use affect each other.
• Tell your clinician about any thoughts of suicide or self-harm, as risk is taken seriously and supported.
• Ask who will coordinate your care across the different services.
• Save crisis numbers in your phone: 999, and Samaritans 116 123 (free, day or night, anywhere in the UK). For urgent but non-life-threatening advice, use NHS 111 in England, Scotland or Wales; in Northern Ireland, contact your GP out-of-hours service or your HSC Trust's Phone First arrangement instead.

What happens

Care usually starts with an assessment that looks at both your mental health and your substance or behavioural use together, rather than treating them as separate problems. Risk, including any thoughts of suicide, is checked and a safety plan made where needed.

From there, a coordinated plan is put together. UK guidance recommends that mental health services usually lead on assessment and care planning, with a named care coordinator who is your main contact and who works with substance services, your GP, and any housing or social support.

Treatment then addresses both conditions: the right care for the mental illness (such as therapy and medication) and for the substance or behaviour (such as detox, anti-craving medication or relapse prevention). The plan is reviewed regularly, especially after a crisis or relapse, and you should not be discharged simply for missing an appointment.

Is this treatment right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

The biggest risk in dual diagnosis is falling between services, and the higher risk of crisis when both problems are present. UK guidance is clear that you should not be turned away by mental health services for using substances, nor discharged just for missing appointments. If care feels disjointed, ask who your coordinator is. If you ever feel unsafe or hopeless, treat it as an emergency: call 999 or the Samaritans on 116 123.

Published figures to discuss

Dual diagnosis is common, and studies suggest a large proportion of people in drug and alcohol services also have a mental health condition, but exact figures vary widely with the population studied and how each condition is defined. Risk of crisis and of poorer outcomes is higher when both are present and untreated, which is why coordinated care matters. We avoid quoting precise percentages where the evidence does not support a firm figure.

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

What happens afterwards

Dual diagnosis care is ongoing rather than a one-off treatment, so "recovery" here means how both your mental health and your substance use improve over time with coordinated support. Progress is usually gradual, with ups and downs.

• Ups and downs in both mood and substance use as treatment takes hold
• Symptoms of one condition flaring while the other improves
• Tiredness and stress from managing several appointments
• Cravings and difficult feelings that ease gradually with support
• Setbacks that, with coordinated care, do not undo your progress

Aftercare

• Keep in contact with your care coordinator and attend appointments where you can.
• Take all medicines as prescribed and report side effects or interactions.
• Keep using relapse-prevention skills for the substance or behaviour.
• Continue treatment and support for the mental illness.
• Use your safety plan and crisis numbers if your mood drops or you feel unsafe.
• If you miss appointments, expect services to follow up; reach back out if you drift away.
• Keep practical support (housing, money) in place, as it affects both conditions.

• Name and contact details of your care coordinator
• A combined care plan covering both conditions
• A list of all your medicines and when they are reviewed
• A safety or crisis plan you can follow
• Crisis numbers saved: 999, Samaritans 116 123, and NHS 111 for urgent advice (England, Scotland and Wales; in Northern Ireland use GP out-of-hours or your HSC Trust's Phone First service)
• Details of your next appointments across services

⚠ Get urgent help if…

• Thoughts of suicide or of harming yourself or others — call 999 or the Samaritans free on 116 123 at any time
• Feeling hopeless, trapped or unable to cope
• A sharp worsening of mood, anxiety, or psychotic symptoms such as hearing voices
• A return to heavy substance use, especially opioids after a break (overdose risk)
• Signs of overdose (very drowsy, slow or stopped breathing, blue lips) — call 999 and use naloxone if available
• Severe withdrawal symptoms such as shaking, confusion, seizures or hallucinations
• Being passed between services with no one taking responsibility for your care

Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your psychiatrist gives you.

Results & realistic expectations

A good outcome in dual diagnosis is both conditions becoming more stable and manageable, with fewer crises and a better quality of life, supported by joined-up care. Because two conditions are involved, progress can be slower, and the aim is steady improvement rather than a quick fix.

Coordinated care cannot guarantee that neither condition will ever flare, but treating both together gives the best chance of progress and reduces the risk of falling between services. With the right support, many people manage both conditions well over time.

Both conditions are usually managed over the long term rather than cured quickly. The risk of relapse or a mental health setback tends to fall as things stabilise, but staying connected to coordinated support, especially during stressful periods, helps protect progress. Plans usually need reviewing as circumstances and symptoms change.

Related tests, treatments or support

Dual diagnosis care brings together treatment for the mental illness and for the substance or behavioural problem, plus practical support with housing, money and relationships. The whole point is that these are combined rather than provided separately. Relapse prevention and, where suitable, anti-craving medication are usually part of the plan.

Follow-up & long-term care

Follow-up is ongoing and coordinated, usually through your care coordinator, with regular reviews across mental health and substance services. After a crisis or relapse, contact is stepped up rather than withdrawn. Ask who is responsible for your overall care and how to reach urgent help, including out of hours.

• Stay in contact with your care coordinator and services
• Keep taking and reviewing medicines for both conditions
• Maintain relapse-prevention skills and any substitute or anti-craving medication
• Keep a current safety or crisis plan
• Keep practical support such as housing and money in place

Repeat, follow-on and what comes next

• Care plans are routinely revised as one or both conditions change.
• Relapse of substance use and flares of mental illness are common and lead to the plan being adjusted, not abandoned.
• Medication and the balance of treatment often need changing over time.

Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.

What good aftercare looks like

• A named care coordinator and a single, shared care plan covering both conditions.
• Clear crisis and safety planning, including suicide risk and, where relevant, overdose and naloxone.
• Good communication between mental health, substance and other services.
• Regular review of both conditions and of medication.
• Follow-up rather than discharge when appointments are missed, with checks on safety.

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

• Whether you use NHS and free services or pay for private care
• How many services and clinicians are involved in coordinated care
• The number and length of appointments across both conditions
• Whether medication and its monitoring are included
• Whether inpatient or more intensive care is needed at any point
• Whether practical support such as housing or social care is part of the plan

• Who coordinates care and how the different services work together
• What is included for both the mental health and the substance problem
• Whether medication and monitoring are included or separate
• What crisis and out-of-hours support is provided
• What follow-up and review is included over time
• The cancellation and missed-appointment policy, and what happens if you miss one

On the NHS? NHS mental health and substance services should provide free, joined-up care for dual diagnosis and should not turn people away for having both conditions; private care exists but coordination, not payment, is the key issue.

You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.

Consent traps and marketing red flags

These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.

Choosing a specialist safely

• Check the psychiatrist is on the GMC Specialist Register for this area.
• Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
• You're entitled to time to consider and to have your questions answered before you agree — the psychiatrist who looks after you should explain it, not a salesperson.
• Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
• You're entitled to your total cost in writing — including any follow-up — before you decide.

How Vuemedics verifies every consultant →

Take this to your consultation. A good psychiatrist will welcome every one of these.

• Who is my care coordinator, and how do the services work together?
• How will both my mental health and my substance use be treated at the same time?
• How will my medicines be managed to avoid harmful interactions?
• What is my crisis and safety plan, and who do I call out of hours?
• What happens if I relapse or my mental health gets worse?
• How will practical issues like housing and money be supported?
• Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
• Will you be the psychiatrist who carries out my treatment, and who looks after me afterwards?
• What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
• What does a realistic result look like — and what can this treatment not achieve?
• What are my options, including waiting, doing nothing for now, or choosing a different approach?
• Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
• What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Find a verified psychiatrist for dual diagnosis (addiction with mental illness)

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How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: NICE NG58 — coexisting severe mental illness and substance misuse (recommendations) NICE NG58 — overview Royal College of Psychiatrists — mental health information We Are With You — drug and alcohol support NHS — mental health services Samaritans (free, 24/7) — 116 123 nidirect — urgent and emergency care services (Northern Ireland) nidirect — GP out-of-hours service (Northern Ireland)

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.