Europe is facing a quiet but serious public health challenge. Millions of people across the continent are living with dual disorders, meaning they experience both a mental health condition and a substance use problem at the same time. A new publication from the European Union Drugs Agency (EUDA) brings this issue into sharp focus, urging governments and health systems to invest in earlier intervention, prevention and more joined-up care.

What Are Dual Disorders and Why Do They Matter?

Dual disorders occur when a mental health condition and a substance use disorder exist in the same person. They may develop at the same time, one after the other, or entirely independently. In practice, the two conditions tend to reinforce each other, making both harder to treat and recovery harder to sustain.

Someone with depression may turn to drugs or alcohol to cope with emotional pain. Over time, regular substance use alters brain function. This raises the risk of anxiety, psychosis or deeper depression. The cycle becomes difficult to break, which is precisely why early detection and prevention matter so much.

Anxiety disorders, mood disorders such as depression and bipolar disorder, personality disorders, psychotic disorders and conditions like ADHD all appear frequently alongside substance use problems. Alcohol, opioids, cocaine, cannabis and sedatives are the substances most commonly involved.

Certain groups carry a heavier burden. Young people, individuals in custody, people experiencing homelessness and women who have lived through trauma all face a higher risk of developing co-occurring mental health and substance use disorders. Reaching these groups early, before problems become entrenched, is essential.

How Common Are Co-Occurring Mental Health and Substance Use Disorders?

The numbers tell a striking story. Studies in European treatment settings show that between 42% and 90% of people with substance use disorders also carry a co-occurring mental health condition. From the other direction, around 30% to 50% of people with severe mental illness who attend mental health services also have a substance use disorder.

People with dual disorders relapse more often, need hospital care more frequently, and drop out of treatment at higher rates than those with a single condition. They also face higher rates of unemployment and homelessness, and greater contact with the criminal justice system. Rates of suicidal ideation and suicide are notably elevated in this group.

These figures make a strong case not only for better treatment, but for stronger prevention. Identifying and supporting people at risk before both conditions take hold offers the greatest chance of a lasting recovery.

How the Pandemic Deepened the Dual Disorders Crisis

The COVID-19 pandemic pushed the issue firmly up the agenda. Social isolation, stress and disruptions to healthcare services worsened mental health across the continent and drove increases in problematic substance use for many people.

In 2023, the Council of the European Union responded. It called on Member States, the European Commission and relevant EU agencies to act on twelve priority measures. These span prevention, early detection, treatment and coordination for people with co-occurring disorders. The EUDA’s new miniguide, released on 21 May 2026, directly supports this work by drawing together the latest evidence and practice from across Europe.

Three Models of Care, and Why Integration Wins

The miniguide sets out three approaches that European countries currently use to address dual disorders.

The sequential model treats one disorder first and defers care for the other until the first stabilises. Because the two conditions feed each other, leaving one unaddressed weakens the overall treatment. Relapse and dropout rates are higher as a result.

The parallel model runs treatment for both conditions at the same time, but through separate services with little coordination. Patients often end up navigating between providers on their own. For people already at high risk of dropping out, this is particularly difficult.

The integrated model brings mental health and substance use care together under one coordinated plan, delivered by a multidisciplinary team. Clinicians share treatment plans, divide responsibilities clearly, and keep patients engaged throughout their recovery. People receive the right support regardless of where they first seek help.

Research consistently backs integrated care as the strongest approach. A 2022 mapping exercise across 26 European countries found that most countries now offer some form of integrated service for dual disorders. Coverage, however, remains largely concentrated in cities and falls well short of meeting demand.

Training Staff Is a First Step Towards Better Dual Disorders Care

Investment in professional training stands out as one of the most immediate and practical steps available. Many staff working in mental health services lack confidence in identifying substance use problems. Many working in addiction services lack equivalent skills in mental health. This expertise gap is one of the biggest barriers people with dual disorders face when seeking help.

Well-designed training programmes improve clinical competence and reduce stigma. When health professionals approach people with co-occurring conditions with greater understanding, therapeutic engagement improves and recovery outcomes improve with it.

In 2024, the EUDA introduced a standardised measure of mental health disorders into European drug treatment monitoring. This gives policymakers a clearer picture of the scale of the problem and builds the evidence base for more effective, prevention-focused responses.

What Must Change to Protect More People

Improving outcomes for people with dual disorders will take effort on several fronts. Health systems need better data on co-occurring mental health and substance use disorders across different settings and population groups. Researchers need to strengthen the evidence base for psychosocial treatments and early intervention strategies. Services need sustained investment to scale up integrated and preventive care.

Specific gaps remain. Custodial settings such as prisons offer a real opportunity: the structure of the custodial environment allows for more consistent detection and treatment of dual disorders, with potential benefits for recovery and reductions in reoffending. Women, particularly those living with post-traumatic stress disorder alongside substance use problems, also need far more targeted support.

Later in 2026, the EUDA plans to run a series of webinars on responding to dual disorders, keeping the momentum alive at a European level.

The case for action is strong. The evidence points clearly towards early intervention, integrated mental health care and sustained prevention as the most effective way to break the cycle. Treating these conditions as separate problems, managed by separate systems, has not worked. Bringing care together, reaching people earlier and focusing on long-term recovery is the path forward.

Source: dbrecoveryresources