Treatment Engagement for SUD and Mental Illness in the U.S.

Naomi Carr
Brittany Ferri
Written by Naomi Carr on 18 December 2025
Medically reviewed by Brittany Ferri on 22 December 2025

It is common for people with substance use issues also to experience mental health conditions, and vice versa. However, the level of treatment engagement and retention among this population is limited due to various factors and barriers. Treatment approaches continue to be developed to help address these issues.

Treatment Engagement for SUD and Mental Illness in the U.S.

The importance of treatment engagement and retention

Substance use disorders (SUDs) affect around 48.4 million adults in the United States, with only 11.7 million (under a quarter) of these individuals utilizing professional SUD treatment. Around half of people with an SUD develop a mental illness at some point in their lifetime, and vice versa.

Impairments in functioning and well-being due to SUD and/or mental illness can include:

These impairments are likely to be more severe among those with co-occurring SUD and mental illness, highlighting an increased need for intervention. However, concurrent SUD and mental illness can be complex and challenging to address, often leading to poorer treatment outcomes and more engagement issues, compared to those with either SUD or mental illness.

As such, there is a need for comprehensive and integrated treatment approaches among those with a dual diagnosis, in order to effectively manage all aspects of the individual’s well-being.

What the national study shows

Data compiled by the Substance Abuse and Mental Health Services Administration (SAMHSA) within the 2023 National Survey on Drug Use and Health (NSDUH) show the frequency of professional treatment among people with either or both SUD and mental illness (MI).

This data was collected among over 92,000 individuals aged 18 and over, in the United States. The prevalence of SUD among this population was 18.1%, and the prevalence of any MI was 23%.

Sought treatment for SUDSought treatment for MI
Among the full study population4.6%22.3%
Among those with SUD14.4%37.0%

These figures indicate that people are far more likely to seek mental health treatment than SUD treatment. This highlights, in particular, the prevalence of barriers to SUD treatment seeking.

Barriers to engagement: Multi-level reality

There are many reasons why people experience barriers to treatment, ranging from personal reluctance to practical challenges. For example, common barriers to substance use and mental health treatments include:

Evidence-based strategies to improve engagement

The following aspects are found to be crucial to improved engagement and retention in SUD and mental health care:

  • Strong family and friend support networks
  • Personal motivation
  • Trusting therapeutic relationships
  • Financial support
  • Preventing parents from being separated from their children or providing childcare alongside treatments
  • Flexibility in treatment delivery systems
  • Population-specific treatments, such as women-only residential programs
  • Empathetic and knowledgeable service providers

Evidence-based programs

Evidence-based treatment strategies to help address these aspects include:

  • Motivational interviewing and contingency management: Motivational interviewing (MI) and contingency management (CM) provide rewards and motivation for individuals in recovery. These can be important factors in improving treatment engagement and adherence, helping people explore their own values and goals.
  • Community-based outreach programs: Outreach programs can provide care to individuals in rural areas or within communities that are less likely to have access to services. This approach can reduce significant barriers to treatment, helping to improve engagement and retention.
  • Peer support: Peer support can include group meetings, education, and advocacy, led and provided by individuals who are also in recovery. This can help individuals develop trusting relationships with people who have lived similar experiences, who can provide care with an empathetic and non-judgmental approach.
  • Family-focused interventions: This can include interventions such as family therapy, which can be of particular benefit to adolescents with concurrent SUD and mental health issues, providing education, support, and counseling for the family unit. Similarly, some organizations offer childcare alongside treatment or accommodation for parents and children while adults are engaged in residential treatment programs. This can help reduce reluctance to engage in treatment or drop-outs associated with family separation.
  • Behavioral therapies: Interventions such as cognitive behavioral therapy (CBT) are found to be effective in both SUD and mental health treatment. They can be particularly beneficial for those with co-occurring conditions, as they address aspects of both concurrently. This integrated and structural approach can improve treatment engagement and medication adherence. 

Moving toward better engagement and outcomes

As research into the management of these conditions progresses, novel ideas and approaches continue to be developed to address the challenges faced in the treatment of co-occurring disorders. 

Additionally, further research is required in order to develop integrated treatment approaches that address specific co-occurring conditions, relating to the different types and severities of mental health conditions and specific substance use issues. 

Resources:

  1. Substance Abuse and Mental Health Services Administration. (2024). Key Substance Use and Mental Health Indicators in the United States: Results from the 2024 National Survey on Drug Use and Health. Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration. Retrieved from
  2. SAMHSA. (2013). Chapter 3 – Mental Health and Substance Use Disorders: Impairment in Functioning. In Behavioral Health, United States, 2012. Rockville, MD: SAMHSA. Retrieved from
  3. Iqbal, M.N., Levin, C.J., & Levin, F.R. (2019). Treatment for Substance Use Disorder With Co-Occurring Mental Illness. Focus (American Psychiatric Publishing), 17(2), 88-97. Retrieved from
  4. Acuff, S.F., Ellis, J.D., Wolinsky, D., Meisel, S.N., & Strickland, J.C. (2025). Treatment Engagement for Substance Use Disorder and Mental Illness in the United States. Psychiatry Research, 354, 116806. Retrieved from
  5. Wolfe, D. M., Hutton, B., Corace, K., et al. (2023). Service-Level Barriers to and Facilitators of Accessibility to Treatment for Problematic Alcohol Use: A Scoping Review. Frontiers in Public Health, 11, 1296239. Retrieved from
  6. Farhoudian, A., Razaghi, E., Hooshyari, Z., Noroozi, A., Pilevari, A., Mokri, A., Mohammadi, M.R., & Malekinejad, M. (2022). Barriers and Facilitators to Substance Use Disorder Treatment: An Overview of Systematic Reviews. Substance Abuse: Research and Treatment, 16, 11782218221118462. Retrieved from
  7. McGovern, M.P., & Carroll, K.M. (2003). Evidence-Based Practices for Substance Use Disorders. The Psychiatric Clinics of North America, 26(4), 991–1010. Retrieved from
  8. SAMHSA. (2020). Chapter 5 - Strategies for Working With People Who Have Co-Occurring Disorders. In Substance Use Disorder Treatment for People With Co-Occurring Disorders: Updated 2020 [Internet]. Rockville, MD: SAMHSA. Retrieved from

Activity History - Last updated: 22 December 2025, Published date:


Reviewer

Brittany Ferri

PhD, OTR/L

Brittany Ferri, PhD, OTR/L is an occupational therapist, health writer, medical reviewer, and book author.

Activity History - Medically Reviewed on 18 December 2025 and last checked on 22 December 2025

Medically reviewed by
Brittany Ferri

Brittany Ferri

PhD, OTR/L

Reviewer

Recovered Branding BG
Ready to talk about treatment? Call today. (833) 840-1202
Helpline Information

Calls to numbers marked with (I) symbols will be answered or returned by one of the treatment providers listed in our Terms and Conditions, each of which is a paid advertiser.

In calling the helpline you agree to our Terms and Conditions. We do not receive any fee or commission dependent upon which treatment or provider a caller chooses.

There is no obligation to enter treatment.

Access State-Specific Provider Directories for detailed information on locating licensed service providers and recovery residences in your area.

For any specific questions please email us at info@recovered.org