Detox can be complicated when substance use is only part of the picture. A person may be dealing with alcohol or drug dependence while also living with depression, anxiety, PTSD, bipolar disorder, or another mental health disorder. In that situation, treating withdrawal without paying attention to mental health can leave important symptoms unaddressed.
This overlap is common. The Substance Abuse and Mental Health Services Administration (SAMHSA) reports that about 21.2 million U.S. adults had both a mental illness and a substance use disorder in 2024. Earlier SAMHSA data also found that one in four adults with both serious mental illness and a substance use disorder received neither substance use nor mental health treatment in 2023.
Detox for dual diagnosis is designed around that overlap. The goal is not to solve every health issue during detox. It is to stabilize the person, manage withdrawal safely, identify co-occurring disorders, and build a treatment plan that continues after substances have cleared the body.




