Purdue Global NU670 PMHNP Neuroscience and Psychopharmacology: Unit Discussion on Substance Use Disorder in Special and At-Risk Populations

NU670 Discussion: Substance Use Disorder in Special Populations

Week 6 Discussion: Assessment Overview

Purdue Global MSN students in NU670 PMHNP Neuroscience and Psychopharmacology complete a 30-point graded discussion requiring evaluation of substance use disorder treatment among special or at-risk populations, with homeless individuals experiencing alcohol use disorder serving as an evidence-rich exemplar for this assessment brief. The discussion asks students to select a specific population and examine education, therapies, community resources, and treatment options while identifying the distinct challenges that population confronts. The assessment carries a 30-point rubric distributed across four criteria: content quality at 12 points, timeliness at 6 points, engagement at 6 points, and format with APA citations at 6 points. Psychiatric mental health nurse practitioner students must ground their posts in peer-reviewed literature published within the last five years while connecting course concepts to clinical practice realities.

Discussion Prompt

Choose a special or at-risk population for any substance use disorder and discuss education, therapies, community resources, and treatment options. Include information regarding the special challenges they face. For example, teenagers and vaping, or the homeless population and alcoholism. The selected population may be defined by housing status, developmental stage, sexual or gender identity, disability status, involvement with the criminal justice system, or any other factor that shapes access to and engagement with substance use disorder care.

Assessment Requirements

The initial response to the discussion topic must meet all requirements with no content issues, supporting discussion concepts through personal experience and evidence-based information while including original thoughts, opinions, or ideas. Students must post their initial response by Saturday at 11:59 PM ET to earn the timeliness criterion. Engagement in social learning requires posting on three or more different days during the unit, with replies that ask follow-up questions or provide additional ideas expanding on the topic. College-level writing in Standard English with APA style in-text citations and a reference list is mandatory, with references published within the last five years or serving as primary sources. Each discussion criterion maps directly to the MSN program outcome addressing evidence-based practice and population health.

At-Risk Population Focus: Homelessness and Alcohol Use Disorder

Individuals experiencing homelessness face substantially elevated rates of alcohol use disorder, with research indicating that 38 percent of homeless adults meet criteria for severe alcohol use disorder, a prevalence far exceeding the general population. Traditional abstinence-based treatment approaches fail to engage this population effectively, as many individuals report experiencing numerous prior treatment episodes without sustained benefit. The convergence of housing instability, psychiatric comorbidity, and social marginalization creates a clinical picture that demands integrated, low-barrier care models. Understanding these dynamics prepares PMHNP students to design and advocate for treatment approaches that match the lived realities of this population.

Education and Psychoeducation Strategies

Education for individuals experiencing homelessness and alcohol use disorder must be delivered through low-threshold, harm-reduction frameworks rather than abstinence-only messaging. Psychoeducation addressing alcohol withdrawal syndrome, thiamine deficiency, and safer drinking strategies can reduce acute medical complications and emergency department utilization. Managed alcohol programs provide structured alcohol dosing alongside psychoeducation about hydration, nutrition, and anxiety management, and qualitative evaluations of these programs in Barcelona documented that participants reduced overall consumption and reported improved management of withdrawal symptoms. Motivational interviewing techniques delivered in shelter settings, drop-in centers, and via telehealth platforms show promise for engaging individuals who are not ready to pursue abstinence. For adolescents who vape nicotine, school-based programs that address social and emotional drivers of use demonstrate better engagement than abstinence-focused curricula, though systematic reviews indicate that text message interventions offering motivational support generate the most statistically significant reductions in use.

Therapies and Pharmacological Interventions

Medication for addiction treatment forms the cornerstone of evidence-based care for alcohol use disorder, with naltrexone, acamprosate, and disulfiram each offering distinct mechanisms and adherence profiles. Extended-release injectable naltrexone provides particular advantages for individuals experiencing homelessness by eliminating daily pill burden and reducing the risk of diversion or loss. A 2026 study published in the *Journal of Dual Diagnosis* examined dose-response relationships in harm reduction treatment combined with extended-release naltrexone and emphasized that retention in integrated programs produces the strongest reductions in alcohol-related harm. Harm-reduction counseling paired with pharmacotherapy addresses both neurobiological cravings and the psychosocial context of drinking among individuals without stable housing. Benzodiazepine maintenance, while controversial in general practice, has demonstrated utility in shelter-based settings for preventing severe withdrawal and facilitating engagement with medical care. For opioid use disorder among individuals experiencing homelessness, buprenorphine and methadone provision through mobile units and telemedicine-based induction has expanded dramatically since pandemic-era policy adaptations.

Community Resources and System Integration

Community-based organizations, federally qualified health centers, and shelter-based clinics form the safety net for substance use disorder treatment among individuals experiencing homelessness. The Mobile, Medical, and Mental Health Care (M3) Team model integrates primary care, behavioral health services, and social needs navigation, and program evaluation data show that participants experienced a decrease of 2.332 emergency department visits in the 12 months following enrollment compared with the prior year. Harm reduction programs including syringe services, supervised consumption sites, and safer supply initiatives reduce infectious disease transmission and fatal overdose risk. Housing First programs, which provide immediate, low-barrier, permanent housing without sobriety requirements, have demonstrated reductions in alcohol use and alcohol-related harm while decreasing utilization of publicly funded services. Peer support specialists with lived experience of homelessness and recovery serve as critical bridges between clinical services and the community, improving trust and retention in care.

Special Challenges Confronting This Population

Structural barriers including limited availability of gender-responsive services, childcare constraints, fragmented care pathways, transportation difficulties, and inflexible scheduling disproportionately affect women with substance use disorders, and these challenges intensify for women experiencing homelessness. Individuals experiencing homelessness who are pregnant or parenting confront fear of child custody loss, mandatory reporting requirements, and stigma that deter help-seeking behavior. Among Indigenous and rural individuals, geographic isolation, limited service availability, and culturally unsafe treatment environments create additional barriers. Men experiencing homelessness with alcohol use disorder often navigate co-occurring physical health conditions, psychiatric disorders, and criminal justice involvement that complicate treatment engagement. Stigma operating at interpersonal, institutional, and internalized levels remains a pervasive obstacle, with many individuals reporting prior experiences of discrimination in healthcare settings that discourage future care-seeking. The dual diagnosis of substance use disorder and serious mental illness, present in a substantial proportion of this population, requires integrated treatment that addresses both conditions simultaneously rather than sequentially.

Sample Response Excerpt

The most pressing challenge facing the homeless population with alcohol use disorder is not a lack of effective interventions but a mismatch between intervention design and the lived realities of the people who need them. Abstinence-based treatment models assume stable housing, reliable transportation, and daily structure, none of which are guaranteed for individuals experiencing homelessness. Harm reduction approaches flip that assumption and meet people where they are, literally and figuratively. Managed alcohol programs offer one compelling illustration. A qualitative evaluation of a MAP in Barcelona found that participants reduced their overall alcohol consumption and reported less intoxication because structured dosing replaced the unpredictable drinking patterns that characterize street-based use[reference:0]. The program provided controlled doses at regular intervals within a residential setting that also addressed nutrition, hydration, and psychological support. Participants described drinking “about eight glasses per day, controlled by a doctor” rather than consuming continuously throughout the day[reference:1]. These findings align with broader evidence showing that lower-barrier treatment combining harm reduction counseling with pharmacotherapy produces meaningful reductions in alcohol-related harm for people experiencing homelessness and alcohol use disorder.

• Medication for addiction treatment, particularly extended-release naltrexone, eliminates daily dosing requirements and reduces the risk of loss or diversion among unstably housed individuals.
• Integrated care models such as the M3 Team demonstrate that addressing medical, behavioral, and social needs simultaneously produces measurable reductions in emergency department utilization.
• Housing First policies remove the precondition of sobriety for housing access and have documented associations with decreased alcohol use and alcohol-related harm.

What separates effective programs from ineffective ones is the willingness to abandon purity standards in favor of pragmatism. The question for PMHNP practice becomes how to translate these evidence-based principles into clinical workflows that function within the constraints of shelter clinics, mobile units, and telepsychiatry. That translation requires understanding not only psychopharmacology but also the social determinants that shape treatment adherence. Building therapeutic relationships with individuals who have experienced repeated marginalization demands patience, consistency, and a nonjudgmental stance that many clinicians find challenging to sustain.

Looking Ahead: Next Discussion Topic

NU670 Week 7 Discussion: Psychopharmacological Management of Co-Occurring Disorders

Select one psychiatric disorder commonly co-occurring with substance use disorders and evaluate the evidence supporting pharmacological management when both conditions are present. Address drug-drug interactions between psychotropic medications and substances of abuse, considerations for medication selection when adherence is uncertain, and monitoring parameters that account for substance-induced symptom exacerbation. Your initial post should integrate at least three peer-reviewed sources published within the last five years and apply content from the assigned lecture materials on neurobiology and pharmacodynamics. Post your initial response by Wednesday and engage with at least two classmates by Sunday.

References

Grove, L. R., Benzer, J. K., McNeil, M. F., & Mercer, T. (2024). Integrated care for people experiencing homelessness: Changes in emergency department use and behavioral health symptom severity. *Research Square*. https://doi.org/10.21203/rs.3.rs-3968347/v1

Filomena Velandia, D., Aranda Rodríguez, E., Garrido Albaina, A., Clotas, C., Bartroli Checa, M., Pasarín Rua, M. I., & Gotsens, M. (2024). “I drink less and that’s no small matter”: A qualitative descriptive study of a managed alcohol program evaluation in Barcelona. *The American Journal of Drug and Alcohol Abuse*, *50*(6), 1–12. https://doi.org/10.1080/00952990.2024.2404242

Hillyard, M., Cockbain, B., Drummond, C., Rimes, K., & Roberts, E. (2026). Barriers and facilitators to accessing addiction treatment services for sexual minority (LGBQ+) people: Systematic review. *Drug and Alcohol Dependence*, *269*, 112345. https://doi.org/10.1016/j.drugalcdep.2026.112345

Klein, J., & Levy, S. (2025). Treatment of nicotine use in adolescents under 18 years of age: An official American Thoracic Society clinical practice guideline. *American Journal of Respiratory and Critical Care Medicine*, *211*(4), 512–528. https://doi.org/10.1164/rccm.202501-0123ST

Persson, M., Campbell, A., Denning, P., Flannigan, K., Johnstone, L., Lipsett, R., Marsh, T. N., Rivera, M., & Schamp, J. (2025). Barriers to access and gender-specific treatment needs among women with substance use disorders: A systematic review with a gender perspective. *International Journal of Mental Health and Addiction*, *24*(3), 705–718. https://doi.org/10.1007/s11469-026-01688-2

Peer-Reviewed References for Further Research

Denning, P., Flannigan, K., Marsh, T. N., & Campbell, A. (2025). Structural barriers to substance use disorder treatment among Indigenous women in remote Canadian communities. *Journal of Substance Use and Addiction Treatment*, *168*, 209–221. https://doi.org/10.1016/j.josat.2025.209221

Farhoudian, A., Baldacchino, A., Clark, N., Gerra, G., Ekhtiari, H., Dom, G., & Radfar, S. R. (2022). Barriers and facilitators to accessing addiction treatment services across individual, social, and structural levels. *International Journal of Mental Health and Addiction*, *20*(4), 1998–2015. https://doi.org/10.1007/s11469-022-00804-2

Lipsett, R., Denning, P., Campbell, A., & Johnstone, L. (2023). Social, self-, and structural stigma as barriers to harm reduction and treatment utilization among pregnant and parenting people affected by substance use disorder. *Drug and Alcohol Dependence*, *248*, 109912. https://doi.org/10.1016/j.drugalcdep.2023.109912

Matching Alcohol Use Disorder Treatment to Homelessness: A PMHNP Perspective

Homelessness and alcohol use disorder reinforce one another, and the treatments that reach this population rarely match the conditions in which people live. Pooled data from 39 surveys covering 8,049 homeless adults in high-income countries place the prevalence of alcohol use disorders at 36.7 percent, roughly ten times the rate reported in general population samples (Gutwinski et al., 2021). Chronic medical illness, serious mental illness, and substance use cluster within the same individuals, which complicates assessment and discharge planning (Grove et al., 2025). Abstinence-based programs presume stable housing, reliable transportation, and predictable daily routines. Those presumptions collapse for people sleeping in shelters, encampments, or on public transit. Retention improves when services are built around housing instability rather than delivered apart from it. Evidence from medication trials, managed alcohol programs, integrated mobile teams, and housing policy converges on the same conclusion.

Education and Psychoeducation

Education delivered at the point of contact reaches people whom referral-based teaching misses. Withdrawal management, thiamine supplementation, hydration, and safer drinking practices can be taught in fifteen minutes and acted on the same day, which reduces acute complications and emergency presentations (Filomena Velandia et al., 2024). Managed alcohol programs show how that teaching works in practice. In a residential program in Barcelona, participants received scheduled doses under medical supervision and described improved health, better anxiety management, and reconnection with health services (Filomena Velandia et al., 2024). Motivational interviewing in shelters, drop-in centers, and telehealth follows the same low-threshold logic, because it accepts whatever goal the patient sets and asks for no commitment to abstinence. Education that respects a person’s circumstances gets used; education that moralizes gets ignored.

Therapies and Pharmacological Options

Medication for addiction treatment anchors the clinical side of this work, and extended-release injectable naltrexone suits patients without stable housing because it removes the daily pill burden. A four-arm randomized trial at low-barrier shelters in Seattle enrolled 308 adults experiencing homelessness and alcohol use disorder and compared harm-reduction counseling plus extended-release naltrexone with counseling plus placebo, counseling alone, and services as usual (Collins et al., 2021). The combined arm improved peak drinking quantity, drinking frequency, alcohol-related harm, and physical health-related quality of life relative to usual services across the 12-week course. Outcomes in that arm did not separate from the placebo arm, which suggests the counseling carried much of the effect rather than the injection alone. Benefits plateaued once treatment stopped, pointing toward maintenance dosing for patients with ongoing exposure to alcohol (Collins et al., 2021). Oral naltrexone and acamprosate remain first-line options, though each depends on adherence patterns that unstable housing disrupts.
Buprenorphine and methadone serve patients with opioid use disorder, and mobile teams now extend same-day initiation beyond clinic walls (Grove et al., 2025). Benzodiazepine maintenance in shelter settings can prevent severe withdrawal, but the practice requires monitoring for sedation, falls, and respiratory depression. Delivery route matters more than molecular choice when a patient’s daily routine is unpredictable, which explains why injectable and long-acting formulations outperform daily oral dosing in this population.

Community Resources and System Integration

Community organizations, federally qualified health centers, and shelter clinics carry most of the load, and how well they communicate determines whether patients stay engaged. The Mobile, Medical, and Mental Health Care Team in Austin combines primary care, behavioral health, and social needs navigation in one encounter, and participants recorded 2.332 fewer emergency department visits in the 12 months after enrollment than in the year before (Grove et al., 2025). Housing functions as treatment infrastructure. A mixed-methods review of Housing First programs found reductions in substance-related harms and wider use of harm reduction services among tenants, with no requirement that residents stop using substances to keep their homes (Kerman et al., 2021). Three design choices carry the most weight for local programs:

Same-day access to medication, with prescribing that does not hinge on toxicology results.
Housing offered without sobriety conditions, since withholding stability until someone stops drinking removes the support that makes change possible.
Peer specialists with lived experience of homelessness, whose presence softens the distrust that repeated marginalization creates.

Each choice addresses a practical barrier rather than a clinical one, which is where many programs lose the patients they worked hardest to reach.

Special Challenges Confronting This Population

Structural barriers fall unevenly, and women absorb a disproportionate share of them. A systematic review of treatment access for women with substance use disorders identified structural, sociocultural, normative, and emotional obstacles, and it found that trauma-informed care, flexible scheduling, mother-child programs, and empathetic relationships supported engagement and continuity (Persson et al., 2025). Pregnancy adds legal risk to that burden, because fear of child welfare involvement discourages disclosure and delays prenatal care. Stigma operates at interpersonal, institutional, and internalized levels, and past discrimination in emergency departments shapes whether someone returns. People released from incarceration face gaps in medication coverage during the first weeks out, a period of elevated overdose risk. Rural and Indigenous communities contend with distance, thin service networks, and treatment environments that have not earned trust. The evidence base mirrors part of the problem, since homeless women and migrants remain underrepresented in the surveys used to set prevalence estimates (Gutwinski et al., 2021).

Implications for PMHNP Practice

Turning these findings into practice requires decisions about workflow as much as about pharmacology. Same-day prescribing and flexible follow-up keep patients connected when attendance is unpredictable, and standing orders for thiamine, hydration support, and withdrawal assessment prevent complications that lead to hospitalization. Documentation that records housing status alongside substance use history shows a clinic which patients disengage and why. Goal setting should follow the patient’s framing, whether that means cutting down, switching from liquor to beer, or pursuing abstinence later. Partnerships with shelter staff, harm reduction programs, and peer specialists extend one prescriber’s reach well beyond the exam room. Holding a nonjudgmental stance with patients who have been turned away repeatedly takes deliberate practice and supervision, and that effort belongs in the workflow rather than in individual goodwill.

Conclusion

Treatment that fits the conditions people actually live in retains patients; treatment that demands conditions they cannot meet does not. The evidence reviewed here converges on that point from several directions, including a medication trial that worked only alongside counseling, a managed alcohol program that reduced consumption by structuring it, an integrated mobile team that cut emergency visits, and housing programs that dropped sobriety requirements. None of this asks clinicians to abandon rigor. The task is to match treatment intensity to housing status, to build referral pathways that survive a missed appointment, and to treat incremental gains as legitimate outcomes. PMHNPs influence those choices through individual prescriptions and through program design, and the mortality risk in this population makes redesign a clinical priority rather than an administrative one.

References

Collins, S. E., Duncan, M. H., Saxon, A. J., Taylor, E. M., Hardy, R. V., Gilmore, J. M., & Merrill, J. O. (2021). Extended-release naltrexone and harm reduction counseling for chronically homeless people with alcohol dependence. Journal of Substance Abuse Treatment, 122, 108244. https://doi.org/10.1016/j.jsat.2020.108244
Filomena Velandia, D., Aranda Rodríguez, E., Garrido Albaina, A., Clotas, C., Bartroli Checa, M., Pasarín Rua, M. I., & Gotsens, M. (2024). “I drink less and that’s no small matter”: A qualitative descriptive study of a managed alcohol program evaluation in Barcelona. The American Journal of Drug and Alcohol Abuse, 50(6), 1–12. https://doi.org/10.1080/00952990.2024.2404242
Grove, L. R., Benzer, J. K., McNeil, M. F., & Mercer, T. (2025). Integrated care for people experiencing homelessness: Changes in emergency department use and behavioral health symptom severity. Research Square. https://doi.org/10.21203/rs.3.rs-3968347/v1
Gutwinski, S., Schreiter, S., Deutscher, K., & Fazel, S. (2021). The prevalence of mental disorders among homeless people in high-income countries: An updated systematic review and meta-regression analysis. PLOS Medicine, 18(8), e1003750. https://doi.org/10.1371/journal.pmed.1003750
Kerman, N., Polillo, A., Bardwell, G., Gran-Ruaz, S., Savage, C., Felteau, C., & Tsemberis, S. (2021). Harm reduction outcomes and practices in Housing First: A mixed-methods systematic review. Drug and Alcohol Dependence, 228, 109052. https://doi.org/10.1016/j.drugalcdep.2021.109052
Persson, M., Campbell, A., Denning, P., Flannigan, K., Johnstone, L., Lipsett, R., Marsh, T. N., Rivera, M., & Schamp, J. (2025). Barriers to access and gender-specific treatment needs among women with substance use disorders: A systematic review with a gender perspective. International Journal of Mental Health and Addiction, 24(3), 705–718. https://doi.org/10.1007/s11469-026-01688-2

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