Dual diagnosis explained
Dual diagnosis means that an addiction and a mental health condition, such as depression, anxiety, ADHD, bipolar disorder or PTSD, occur together. It is best treated in a psychiatrist-led clinic that treats both at the same time.
By the Switzerland Recovery editorial team · Updated · 6 min read
What it means
Dual diagnosis describes an addiction occurring together with a mental health condition. Common pairings include depression, anxiety, ADHD, bipolar disorder, PTSD and eating disorders. Clinicians also call it co-occurring disorders or comorbidity.
How common it is
In the United States, 35% of adults with a mental disorder also had a substance use disorder in 2023 (NIDA, 2023).
In a 2024 survey of Swiss addiction services, about 6 in 10 institutions reported that more than 60% of their clients had a co-occurring mental disorder (Addiction Switzerland, 2024). Depression was the most common, followed by personality, anxiety and trauma-related disorders.
In Switzerland, 26.1% of people with risky substance use report moderate to high psychological distress, against 16.2% of people without risky use (Obsan, 2022).
“Many people who develop substance use disorders are also diagnosed with other mental health disorders”
Why integrated treatment matters
Treating the addiction alone leaves the underlying driver untouched. Treating depression alone ignores the substance that worsens it. Psychiatrist-led clinics treat both at the same time.
Our guide to detox, rehab or psychiatric clinic explains where to start. Alcohol addiction signs and recovery shows how drinking, low mood and anxiety feed each other.
How it is treated
Treatment combines psychiatric assessment, medication where needed and psychotherapy for both conditions. A 2025 meta-analysis of 47 randomised trials found that cognitive behavioural interventions for co-occurring disorders had modest efficacy on substance use outcomes (Drug Alcohol Depend, 2025).
Continuity matters after discharge. A 2019 review concluded that best practice integrates mental health treatment and provides continuity of care after discharge (Drug Alcohol Depend, 2019). Our page on dual diagnosis treatment in Switzerland lists clinics that offer this.
Related treatment pages
Frequently asked questions
Which clinics are best for dual diagnosis?
Licensed psychiatric clinics with addiction specialists on staff. Our dual diagnosis page lists them.
