Table of Contents

Substance use disorders (SUDs) represent one of the most pressing public health challenges facing communities worldwide. These complex conditions affect not only the individuals who struggle with them but also their families, workplaces, and broader society. Among people 12 or older, 16.8% (or 48.4 million people) had a past-year substance use disorder (SUD) according to recent data. Understanding the multifaceted nature of substance use disorders—from their neurobiological underpinnings to evidence-based treatment approaches—is essential for healthcare professionals, educators, policymakers, and anyone seeking to support those affected by these conditions.

This comprehensive guide provides an evidence-based overview of substance use disorders, exploring current definitions, diagnostic criteria, prevalence statistics, risk factors, neurobiological mechanisms, signs and symptoms, treatment modalities, and recovery pathways. By examining the latest research and clinical insights, we aim to foster a deeper understanding of SUDs as treatable medical conditions rather than moral failings, ultimately supporting more effective prevention, intervention, and recovery efforts.

What Are Substance Use Disorders?

Substance use disorders are chronic medical conditions characterized by an individual's inability to control their use of substances despite experiencing significant negative consequences. After decades of research, substance use disorder (SUD) is now understood to be a chronic, treatable brain condition. This understanding represents a fundamental shift from viewing addiction as a character flaw to recognizing it as a complex health condition that affects brain structure and function.

The American Psychiatric Association defines SUDs in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) as a problematic pattern of substance use that results in clinically significant impairment or distress. This definition encompasses a wide range of substances and acknowledges that addiction exists on a continuum of severity rather than as a simple yes-or-no diagnosis.

The Evolution of Diagnostic Criteria

The DSM-5 introduced significant changes to how substance use disorders are diagnosed and classified. Whereas a diagnosis of substance abuse previously required only one symptom, mild substance use disorder in DSM-5 requires two to three symptoms from a list of 11. This change reflects a more nuanced understanding of addiction and eliminates the previous distinction between "abuse" and "dependence" that often caused confusion among clinicians and the public alike.

There are 11 symptoms for each substance class (except for caffeine) that are used to make a substance use disorder diagnosis. These criteria fall into four broad categories: impaired control over substance use, social impairment, risky use, and pharmacological indicators such as tolerance and withdrawal.

Severity Levels and Clinical Significance

SUDs are classified as mild, moderate, or severe based on how many of the 11 criteria are fulfilled: mild, any 2 or 3 criteria; moderate, any 4 or 5 criteria; severe, any 6 or more criteria. This dimensional approach allows clinicians to better match treatment intensity to the severity of the disorder and provides a framework for tracking progress over time.

Two or three criteria point to a mild substance use disorder. Four or five symptoms show someone has a moderate substance use disorder. Six or more criteria indicate a severe substance use disorder, which signals an addiction to that substance. Understanding these severity levels helps healthcare providers develop appropriate treatment plans and helps individuals and families recognize when professional intervention is needed.

Current Prevalence and Statistics

The scope of substance use disorders in the United States and globally is staggering. Recent data reveals both concerning trends and some encouraging signs of progress in addressing this public health crisis.

National Prevalence Data

SUDs affect over 48.5 million Americans aged 12 and over, representing a significant portion of the population. The percentage of people 12 or older with a drug use disorder in the past year increased from 8.7% in 2021 to 9.8% in 2024, indicating that despite progress in some areas, the overall burden of drug use disorders continues to expand.

However, not all trends are negative. The percentage of people 12 or older with an alcohol use disorder in the past year decreased from 10.6% in 2021 to 9.7% in 2024. This decline suggests that prevention and treatment efforts targeting alcohol use may be having a positive impact.

Most Commonly Affected Substances

Most common disorders are related to alcohol, marijuana, and prescription pain relievers. These three categories account for the majority of substance use disorders in the United States, though emerging substances and polysubstance use patterns are creating new challenges for treatment providers and public health officials.

Alcohol Use Disorder (AUD): AUD remains the most prevalent addiction, affecting 29.5 million people, though the rate slightly decreased from 10.6% to 9.7% in the most recent reporting cycle. Despite this slight decrease, alcohol use disorder continues to affect millions of Americans and remains a leading cause of preventable death and disability.

One of the most encouraging developments in recent years has been a significant decline in overdose deaths. Overdose deaths declined from more than 110,000 in 2023 to about 75,000 in 2024, yet there is a tremendous amount of work to be done to sustain and accelerate this progress. This substantial reduction represents thousands of lives saved and suggests that interventions such as increased naloxone availability and expanded access to treatment are making a difference.

Provisional CDC data from February 2025 shows a 24% decline in overdose deaths, including fentanyl, from October 2023 to September 2024—down from 114,000 to 87,000, the lowest 12-month total since June 2020. This decline offers hope that the nation may be turning a corner in the overdose crisis, though vigilance and continued investment in prevention and treatment remain essential.

Co-Occurring Mental Health Conditions

The relationship between substance use disorders and mental health conditions is well-established and clinically significant. The co-occurrence of substance use disorders and mental illness affects 21.2 million adults, with 34.5% of adults with any mental illness also meeting criteria for substance use disorder, highlighting the interconnected nature of behavioral health conditions that demands integrated treatment approaches.

In 2024, among adults aged 18 or older, 33.0% (or 86.6 million people) had either AMI or an SUD in the past year. This substantial overlap underscores the importance of screening for both mental health and substance use issues and providing integrated treatment that addresses both conditions simultaneously.

Types of Substances Involved in SUDs

Substance use disorders can develop in relation to a wide variety of psychoactive substances. Understanding the different categories of substances and their specific effects is important for recognizing risk patterns and tailoring treatment approaches.

Alcohol

Alcohol remains the most widely used and socially accepted psychoactive substance in most cultures. Despite its legal status for adults, alcohol use disorder affects millions of people and contributes to numerous health problems, accidents, and social issues. The accessibility and cultural acceptance of alcohol can make it particularly challenging for individuals to recognize when their use has become problematic.

Prescription Medications

Prescription medications, particularly opioids and benzodiazepines, represent a significant category of substances involved in SUDs. Opioid prescriptions have decreased 52% since 2012, falling from 260.5 million to 125.7 million in 2024. This dramatic reduction reflects increased awareness of the risks associated with opioid prescribing and implementation of prescribing guidelines, though it has also created challenges for patients with legitimate pain management needs.

Other prescription medications that can lead to substance use disorders include stimulants prescribed for attention-deficit/hyperactivity disorder (ADHD), sedatives, and sleep medications. The perception that prescription medications are "safer" than illicit drugs can contribute to misuse and the development of SUDs.

Illicit Drugs

Illicit drugs encompass a wide range of substances including cocaine, methamphetamine, heroin, and synthetic drugs. Polysubstance use increasingly involves stimulants, xylazine, kratom, tianeptine and inhalants. The illicit drug market is constantly evolving, with new synthetic substances and combinations creating unpredictable risks for users.

The contamination of illicit drugs with fentanyl and other potent synthetic opioids has dramatically increased overdose risk in recent years. Even individuals using substances they believe to be relatively low-risk may unknowingly consume lethal doses of fentanyl mixed into their drugs.

Cannabis

Cannabis use and cannabis use disorder have received increased attention as more jurisdictions have legalized or decriminalized marijuana. The prevalence of cannabis use disorder is also growing, with associated mental health and pregnancy-related risks. The increasing potency of cannabis products and the availability of high-concentration extracts have raised concerns about the potential for developing cannabis use disorder, particularly among young people.

Tobacco and Nicotine Products

Tobacco use disorder, primarily involving nicotine addiction, remains a significant public health concern despite decades of prevention efforts. While traditional cigarette smoking has declined, the emergence of e-cigarettes and vaping products has created new pathways to nicotine addiction, particularly among adolescents and young adults.

Inhalants and Other Substances

Inhalants, including solvents, aerosols, and gases, are often overlooked but can cause serious health consequences and lead to substance use disorders. These substances are particularly concerning because they are often readily available in household products and may be used by younger individuals who have limited access to other substances.

Risk Factors for Developing Substance Use Disorders

Substance use disorders do not develop randomly. Multiple risk factors interact to increase an individual's vulnerability to developing an SUD. Understanding these risk factors is crucial for prevention efforts and for identifying individuals who may benefit from early intervention.

Biological and Genetic Factors

Genetics play a substantial role in addiction vulnerability. Family history of substance use disorders significantly increases an individual's risk of developing an SUD. Research suggests that genetic factors account for approximately 40-60% of the variance in addiction risk, though the specific genes involved are complex and interact with environmental factors.

Brain chemistry and neurotransmitter systems also influence addiction risk. Variations in dopamine receptors, serotonin transporters, and other neurochemical systems can affect how individuals experience reward, stress, and the effects of substances. Some individuals may be more sensitive to the rewarding effects of substances or may experience more intense withdrawal symptoms, both of which can contribute to the development of SUDs.

Recent research shows that people with opioid use disorder (OUD) have unique daily rhythmic patterns of gene activity in brain regions that influence addiction. This emerging research on circadian rhythms and addiction highlights the complex biological mechanisms underlying SUDs and may point toward new treatment approaches.

Psychological and Mental Health Factors

Co-occurring mental health disorders represent one of the most significant risk factors for substance use disorders. Depression, anxiety disorders, post-traumatic stress disorder (PTSD), bipolar disorder, and other mental health conditions frequently co-occur with SUDs. Individuals may use substances as a form of self-medication to cope with distressing symptoms, which can lead to the development of addiction.

Trauma and adverse childhood experiences (ACEs) are strongly associated with increased risk of substance use disorders. The Adolescent Brain Cognitive Development (ABCD) Study has found that childhood adversity can have significant effects on brain development and mental health, including the risk of SUD. Experiences such as physical or sexual abuse, neglect, witnessing violence, or growing up with a parent who has a substance use disorder can all increase vulnerability to developing SUDs later in life.

Personality traits and coping styles also influence addiction risk. Impulsivity, sensation-seeking, difficulty regulating emotions, and poor stress management skills have all been associated with increased vulnerability to substance use disorders. Individuals who lack healthy coping mechanisms for dealing with stress, boredom, or negative emotions may be more likely to turn to substances.

Environmental and Social Factors

The environment in which an individual lives and develops plays a crucial role in addiction risk. Peer pressure and social norms around substance use can significantly influence whether someone initiates substance use and whether that use escalates to a disorder. Adolescents and young adults are particularly susceptible to peer influences.

Availability and accessibility of substances directly impact use patterns. Communities where substances are readily available tend to have higher rates of substance use and SUDs. This includes both legal substances like alcohol and tobacco as well as illicit drugs.

Socioeconomic factors also contribute to addiction risk. Poverty, unemployment, lack of educational opportunities, housing instability, and limited access to healthcare all increase vulnerability to substance use disorders. These factors create stress and reduce access to protective resources such as quality education, healthcare, and social support.

Cultural and community norms around substance use shape individual attitudes and behaviors. Communities where heavy drinking or drug use is normalized may have higher rates of SUDs, while communities with strong protective factors and clear norms against substance misuse may have lower rates.

Age of First Use

Those who start using substances before age 13 have a much higher likelihood of developing a long-term disorder compared to those initiating later. Early initiation of substance use is one of the strongest predictors of developing a substance use disorder. The adolescent brain is still developing, particularly in areas related to decision-making, impulse control, and risk assessment, making young people especially vulnerable to the effects of substances.

Demographic Variations in Risk

Risk for substance use disorders varies across demographic groups. Men are much more likely to have substance use problems. They make up about 68.2% of adults in treatment right now. However, women face unique risk factors and may experience more rapid progression from initial use to addiction, a phenomenon sometimes called "telescoping."

American Indian and Alaska Native populations continue to face the highest age-adjusted overdose death rates, reaching approximately 51.6 per 100,000 individuals in 2025. These disparities reflect complex interactions between historical trauma, socioeconomic factors, access to treatment, and other systemic issues that require targeted interventions.

The Neurobiology of Addiction

Understanding how substances affect the brain is fundamental to recognizing addiction as a medical condition rather than a moral failing. Advances in neuroscience have revealed the complex brain changes that occur with repeated substance use and that characterize substance use disorders.

The Brain's Reward System

All substances with addiction potential affect the brain's reward system, particularly the mesolimbic dopamine pathway. This system evolved to reinforce behaviors essential for survival, such as eating and reproduction, by creating pleasurable sensations. Substances of abuse hijack this system, producing surges of dopamine that far exceed those produced by natural rewards.

With repeated substance use, the brain adapts to these excessive dopamine surges through a process called neuroadaptation. The brain may reduce dopamine receptor availability or produce less dopamine naturally, leading to tolerance (needing more of the substance to achieve the same effect) and withdrawal symptoms when the substance is not present.

Changes in Brain Structure and Function

Chronic substance use leads to changes in multiple brain regions beyond the reward system. The prefrontal cortex, which is responsible for decision-making, impulse control, and judgment, shows altered function in individuals with SUDs. This helps explain why people with addiction continue using substances despite knowing the negative consequences and despite genuine desires to stop.

The amygdala, involved in stress and emotional responses, becomes increasingly sensitive in addiction. This heightened stress response can drive continued substance use as individuals seek relief from negative emotional states. The hippocampus, important for memory formation, creates strong associations between environmental cues and substance use, contributing to cravings triggered by people, places, or situations associated with past use.

Tolerance and Withdrawal

Tolerance develops as the brain adapts to repeated substance exposure, requiring increasing amounts to achieve the desired effects. This neuroadaptation is a key feature of substance use disorders and contributes to escalating use patterns.

Withdrawal occurs when substance use is reduced or stopped, as the brain struggles to function normally without the substance to which it has adapted. Withdrawal symptoms vary by substance but can include physical symptoms (tremors, sweating, nausea) and psychological symptoms (anxiety, depression, irritability). The desire to avoid withdrawal symptoms can be a powerful driver of continued use.

Craving and Relapse

Craving, defined as an intense desire or urge to use a substance, is now recognized as a core feature of substance use disorders. Craving is included in the dependence criteria in ICD-10, so adding craving to DSM-5 would increase consistency between the nosologies. Cravings can be triggered by stress, environmental cues, or internal states and can persist long after physical withdrawal has resolved, contributing to the chronic, relapsing nature of addiction.

Signs and Symptoms of Substance Use Disorders

Recognizing the signs and symptoms of substance use disorders is essential for early intervention and treatment. The DSM-5 criteria provide a comprehensive framework for identifying SUDs, with symptoms falling into several key categories.

Impaired Control

Impaired control over substance use is a hallmark of SUDs. This includes taking the substance in larger amounts or for longer periods than intended, having a persistent desire or unsuccessful efforts to cut down or control use, and spending a great deal of time obtaining, using, or recovering from the effects of the substance.

Craving, or a strong desire or urge to use alcohol (or other substances) is now recognized as a key symptom of impaired control. These intense urges can be difficult to resist and may occur even after extended periods of abstinence.

Social Impairment

Substance use disorders often lead to significant social and interpersonal problems. Recurrent alcohol use resulting in a failure to fulfill major role obligations at work, school, or home is a common manifestation of SUDs. Individuals may miss work or school, neglect family responsibilities, or experience declining performance in important life domains.

Continued substance use despite persistent social or interpersonal problems caused or exacerbated by the substance is another key indicator. This might include arguments with family members, loss of friendships, or relationship breakdowns related to substance use. Individuals may also give up or reduce important social, occupational, or recreational activities because of substance use.

Risky Use

Using substances in physically hazardous situations, such as driving while intoxicated or operating machinery under the influence, indicates problematic use. Continued use despite knowledge of having a persistent or recurrent physical or psychological problem that is likely caused or exacerbated by the substance also falls into this category.

Pharmacological Indicators

Tolerance and withdrawal are pharmacological indicators of substance use disorders. Tolerance is defined as needing markedly increased amounts of the substance to achieve intoxication or the desired effect, or experiencing a markedly diminished effect with continued use of the same amount.

Withdrawal manifests as characteristic withdrawal syndrome for the substance or using the substance (or a closely related substance) to relieve or avoid withdrawal symptoms. Withdrawal symptoms vary significantly depending on the substance but can range from mild discomfort to life-threatening medical emergencies.

Behavioral and Psychological Warning Signs

Beyond the formal diagnostic criteria, several behavioral and psychological changes may signal the development of a substance use disorder. These include sudden changes in mood or personality, increased secrecy or lying about activities, withdrawal from family and friends, loss of interest in previously enjoyed activities, changes in sleep patterns, and unexplained financial problems.

Physical signs may include changes in appearance or hygiene, unexplained weight loss or gain, bloodshot eyes, unusual smells on breath or clothing, and frequent illness or injuries. The specific signs vary depending on the substance being used and the individual's circumstances.

The Treatment Gap: Barriers to Care

Despite the availability of effective treatments for substance use disorders, the vast majority of people who need treatment do not receive it. This treatment gap represents a critical public health challenge.

Scope of the Treatment Gap

The catastrophic treatment gap for substance use disorders in the US 2024-2026 represents one of America's most severe public health failures, with 80.6% of the 52.6 million people classified as needing substance use treatment failing to receive any care. Only 10.2 million people—barely one in five of those needing treatment—actually received substance use treatment in 2024, leaving 42.4 million Americans with unmet treatment needs.

Over 93% of those with an SUD don't access specialty care. This staggering statistic highlights the enormous gap between need and service delivery and underscores the urgent need for systemic changes to improve access to treatment.

Common Barriers to Treatment

Common barriers include stigma surrounding addiction, prohibitive costs, lack of knowledge about available resources, insufficient health insurance coverage, geographic barriers in rural areas, shortage of qualified treatment providers, and waiting lists at treatment facilities. Each of these barriers requires targeted interventions to improve treatment access.

Stigma remains one of the most significant barriers to treatment. Many individuals with SUDs fear judgment from family, friends, employers, or healthcare providers. This stigma can prevent people from seeking help until their condition has become severe. Addressing stigma requires public education campaigns that frame addiction as a medical condition rather than a moral failing.

Financial barriers are substantial. Even with insurance coverage, co-pays, deductibles, and limitations on covered services can make treatment unaffordable for many individuals. Those without insurance face even greater challenges. Expanding insurance coverage for substance use treatment and enforcing mental health parity laws are critical steps toward reducing financial barriers.

Geographic barriers particularly affect rural communities, where treatment facilities may be hours away and transportation options limited. Telehealth services have emerged as a promising solution to geographic barriers, though access to reliable internet and technology can itself be a barrier in some communities.

Evidence-Based Treatment Approaches

Effective treatment for substance use disorders typically involves a combination of approaches tailored to the individual's specific needs, the substances involved, and the severity of the disorder. Research shows that addiction is treatable and recovery is possible - though success rates hinge on multiple factors, including the substance, treatment model, and individual support systems.

Medical Detoxification

For many individuals, particularly those with severe substance use disorders or physical dependence, medical detoxification is the first step in treatment. Detoxification involves the medical management of withdrawal symptoms to ensure safety and comfort as the body clears the substance. Depending on the substance, withdrawal can range from uncomfortable to life-threatening, making medical supervision essential in many cases.

Detoxification alone is not treatment for substance use disorder. It addresses the acute physical dependence but does not address the underlying psychological, behavioral, and social factors that contribute to addiction. Detoxification should always be followed by comprehensive treatment to address these factors and support long-term recovery.

Medication-Assisted Treatment (MAT)

Medication-assisted treatment combines FDA-approved medications with counseling and behavioral therapies to treat substance use disorders. MAT is considered the gold standard for treating opioid use disorder and is also effective for alcohol use disorder.

Medication-Assisted Treatment (MAT) for Opioids: Combining medications like buprenorphine or methadone with counseling produces success rates of up to 50% in maintaining long-term abstinence or major reduction in use. These medications work by reducing cravings and withdrawal symptoms, allowing individuals to focus on recovery without the constant distraction of physical discomfort and intense urges to use.

MAT is proven to reduce cravings, prevent relapse, and lower the risk of overdose, giving patients a solid foundation for recovery. For opioid use disorder, medications include methadone, buprenorphine (often combined with naloxone in products like Suboxone), and naltrexone. For alcohol use disorder, medications include naltrexone, acamprosate, and disulfiram.

Over the past year, the AMA has worked to advance evidence-based policies to reduce overdose deaths, including efforts to eliminate prior authorization for MOUD, expand access to those medications, strengthen enforcement of parity laws for mental health and substance use coverage, and increase naloxone availability. Removing barriers to medication-assisted treatment is essential for improving outcomes and saving lives.

Behavioral Therapies

Behavioral therapies are a cornerstone of substance use disorder treatment. These evidence-based approaches help individuals understand their substance use, develop coping skills, change problematic behaviors, and address co-occurring mental health issues.

Cognitive Behavioral Therapy (CBT): CBT and guided self-help currently account for 71.9% of all therapy courses delivered, maintaining its position as the primary intervention for addiction. CBT helps individuals identify and change thought patterns and behaviors that contribute to substance use. It teaches practical skills for managing cravings, avoiding high-risk situations, and coping with stress without substances.

Motivational interviewing is another widely used approach that helps individuals resolve ambivalence about change and strengthen their motivation for recovery. This client-centered approach recognizes that many people with SUDs have mixed feelings about stopping substance use and works to enhance intrinsic motivation rather than imposing external pressure.

Contingency management uses positive reinforcement to encourage abstinence and treatment engagement. Individuals receive tangible rewards for meeting treatment goals, such as negative drug tests or attendance at counseling sessions. This approach has shown particular effectiveness for stimulant use disorders.

Family therapy addresses the family system and helps family members understand addiction, improve communication, and develop healthier patterns of interaction. Family involvement in treatment can significantly improve outcomes, particularly for adolescents and young adults.

Integrated Treatment for Co-Occurring Disorders

Given the high rates of co-occurring mental health and substance use disorders, integrated treatment that addresses both conditions simultaneously is essential. Many people struggling with substance use also face mental health challenges, including depression, anxiety, and trauma. That's why CleanSlate provides behavioral health support at most locations, helping patients address the root causes of addiction.

Integrated treatment recognizes that mental health and substance use issues often interact and exacerbate each other. Treating only one condition while ignoring the other typically leads to poor outcomes. Effective integrated treatment involves coordinated care from providers who understand both mental health and addiction treatment.

Levels of Care

Treatment for substance use disorders is delivered at various levels of intensity, allowing for matching treatment to individual needs. These levels include:

Residential or Inpatient Treatment: Provides 24-hour structured care in a residential setting. This level of care is appropriate for individuals with severe SUDs, those who have not succeeded in less intensive treatment, or those who need a safe environment away from triggers and access to substances.

Partial Hospitalization Programs (PHP): Offer intensive treatment during the day while allowing individuals to return home in the evenings. PHPs typically involve several hours of treatment per day, multiple days per week.

Intensive Outpatient Programs (IOP): Provide structured treatment several times per week while allowing individuals to maintain work, school, or family responsibilities. IOPs typically involve group therapy, individual counseling, and education about addiction and recovery.

Outpatient Treatment: Involves regular counseling sessions, typically once or twice per week, and is appropriate for individuals with less severe SUDs or as a step-down from more intensive treatment.

People who stay in structured treatment for at least 90 days are much more likely to stay sober long-term than those in shorter programs. Treatment duration is a critical factor in outcomes, with longer treatment generally associated with better results.

Peer Support and Mutual-Help Groups

Peer support and mutual-help groups play an important role in recovery for many individuals. Groups like Alcoholics Anonymous (AA), Narcotics Anonymous (NA), SMART Recovery, and others provide ongoing support, accountability, and connection with others who understand the challenges of recovery.

These groups are typically free, widely available, and can provide long-term support that extends beyond formal treatment. While not everyone finds mutual-help groups helpful, research suggests that participation in these groups is associated with improved outcomes for many individuals.

Peer recovery support specialists—individuals with lived experience of addiction and recovery who have received training to support others—are increasingly integrated into formal treatment programs and community-based services. These specialists can provide unique insights, hope, and practical guidance based on their own recovery experiences.

Treatment Success Rates

Treatment success rates vary depending on the substance, treatment approach, individual factors, and how success is defined. For stimulants (e.g., cocaine), which lack effective medications, intensive outpatient treatment yields around 40–50% success in achieving sustained abstinence. Methamphetamine success rates can be lower (20–30%).

It's important to recognize that addiction is a chronic condition, and relapse is common. However, relapse does not mean treatment has failed. Like other chronic conditions such as diabetes or hypertension, addiction may require ongoing management and multiple treatment episodes. Each treatment episode can provide valuable learning and move individuals closer to sustained recovery.

Recovery is real—22 million of 30.5 million adults who've faced a substance use problem (73.1%) are in recovery. This statistic provides hope and demonstrates that recovery is not only possible but common among those who have struggled with substance use disorders.

Special Populations and Considerations

Certain populations face unique challenges related to substance use disorders and may require specialized approaches to prevention and treatment.

Adolescents and Young Adults

Adolescents and young adults are at particularly high risk for substance use and the development of SUDs. The adolescent brain is still developing, particularly in areas related to decision-making and impulse control, making young people more vulnerable to the effects of substances and more likely to engage in risky behaviors.

Among adolescents aged 12-17, the 2024 NSDUH documented encouraging trends, with substance use initiation reaching historic lows for many substances as prevention efforts targeting youth have proven remarkably effective. This positive trend demonstrates the value of evidence-based prevention programs targeting young people.

However, young adults aged 18-25 continue to have the highest rates of substance use across most categories. This age group faces unique challenges including transitions to college or work, increased independence, peer influences, and stress. Treatment approaches for young adults should address developmental needs and may benefit from family involvement and focus on building life skills.

Pregnant and Postpartum Women

Substance use during pregnancy poses significant risks to both mother and baby. Prenatal substance exposure can lead to a range of adverse outcomes including preterm birth, low birth weight, birth defects, and neonatal abstinence syndrome (NAS), in which newborns experience withdrawal symptoms.

Pregnant women with SUDs face unique barriers to treatment, including fear of legal consequences, child protective services involvement, and stigma. Specialized treatment programs for pregnant and postpartum women that provide comprehensive services including prenatal care, parenting education, and childcare can improve outcomes for both mothers and babies.

Older Adults

Substance use disorders in older adults are often overlooked but represent a growing concern as the population ages. Older adults may develop SUDs related to prescription medications, particularly opioids and benzodiazepines prescribed for pain or sleep problems. Alcohol use disorder also affects many older adults.

Older adults metabolize substances differently than younger people and may be more sensitive to their effects. They are also more likely to have multiple medical conditions and take multiple medications, increasing the risk of dangerous interactions. Treatment for older adults should address age-related medical, cognitive, and social factors.

LGBTQ+ Individuals

10.3 million LGBT+ adults had a substance use disorder and/or mental illness in 2020. LGBTQ+ individuals face elevated rates of substance use disorders, likely related to minority stress, discrimination, stigma, and higher rates of mental health conditions. Treatment approaches should be culturally competent and address the unique stressors faced by LGBTQ+ individuals.

Individuals Involved in the Criminal Justice System

The intersection of substance use disorders and the criminal justice system is substantial. Many individuals in jails and prisons have SUDs, and substance use is often related to criminal behavior. Providing treatment in correctional settings and ensuring continuity of care upon release are critical for reducing recidivism and supporting recovery.

Success rates for prison-based treatment reached 37% in 2025. This is up 15 points from ten years ago. This improvement demonstrates that treatment in correctional settings can be effective and highlights the importance of continuing to invest in and improve these programs.

Prevention Strategies

While treatment is essential for those who have developed substance use disorders, prevention efforts that reduce the likelihood of substance use initiation and progression to SUDs are equally important.

Universal Prevention

Universal prevention strategies target entire populations, regardless of individual risk level. These include public education campaigns about the risks of substance use, policies that limit access to substances (such as minimum drinking age laws and tobacco taxes), and school-based prevention programs that teach refusal skills and promote healthy decision-making.

This emphasizes the centrality of middle-school-level prevention, family engagement, and community education. Effective prevention programs engage young people before substance use typically begins and involve families and communities in creating environments that support healthy choices.

Selective Prevention

Selective prevention targets groups at elevated risk for substance use disorders, such as children of parents with SUDs, youth who have experienced trauma, or communities with high rates of substance use. These programs provide more intensive interventions tailored to the specific risk factors faced by these groups.

Indicated Prevention

Indicated prevention targets individuals who are already showing early signs of problematic substance use but have not yet developed a full SUD. The NIDA Clinical Trials Network has developed and validated simple tools for early screening of substance use and SUD and is investigating ways to integrate SUD screening into primary care. Early identification and brief interventions can prevent progression to more severe SUDs.

Environmental Prevention Strategies

Environmental strategies focus on changing the broader context in which substance use occurs. These include policies that regulate the availability and marketing of substances, enforcement of age restrictions, responsible beverage service training, and creating community environments that support healthy behaviors and provide alternatives to substance use.

Harm Reduction Approaches

Harm reduction strategies aim to reduce the negative consequences of substance use for individuals who are not ready or able to stop using substances. While abstinence remains the goal for many treatment programs, harm reduction recognizes that reducing harm is valuable even when complete abstinence is not immediately achievable.

Naloxone Distribution

The report emphasizes the life-saving role of naloxone and calls on policymakers and others to remove treatment barriers for substance use disorder and pain care. Naloxone (Narcan) is a medication that rapidly reverses opioid overdoses. Widespread distribution of naloxone to individuals who use opioids, their family members, and first responders has saved countless lives.

Making naloxone available without a prescription and training community members in its use are important harm reduction strategies that can prevent overdose deaths while individuals work toward recovery.

Syringe Services Programs

Syringe services programs (also called needle exchange programs) provide sterile injection equipment to people who inject drugs, reducing the transmission of HIV, hepatitis C, and other bloodborne infections. These programs also serve as points of contact for connecting individuals to treatment, testing, and other health services.

Safe Consumption Sites

Safe consumption sites, also called supervised injection facilities or overdose prevention centers, provide a hygienic environment where people can use pre-obtained drugs under medical supervision. Staff can intervene in case of overdose and connect individuals to treatment and other services. While controversial, these sites have been shown to reduce overdose deaths and connect people to treatment without increasing drug use in surrounding communities.

The Role of Policy and Systems Change

Addressing substance use disorders effectively requires not only individual-level interventions but also policy and systems changes that create environments supporting prevention, treatment, and recovery.

Insurance Coverage and Parity

Ensuring that insurance plans provide adequate coverage for substance use disorder treatment is essential for improving access to care. Mental health parity laws require that insurance coverage for mental health and substance use treatment be equivalent to coverage for other medical conditions, but enforcement of these laws has been inconsistent. Strengthening parity enforcement can reduce financial barriers to treatment.

Workforce Development

The shortage of qualified addiction treatment providers is a significant barrier to care. Expanding the addiction treatment workforce requires investment in training programs, loan forgiveness for providers who work in underserved areas, and integration of addiction medicine into medical education and other health professions training.

NIDA is helping grow an addiction science workforce that represents the Nation's diverse populace while also capturing diverse disciplines. As part of its Racial Equity Initiative, NIDA recently announced new programs designed to help diverse students and postdoctoral researchers cross-train in addiction science, Big Data, and artificial intelligence. Building a diverse workforce that reflects the communities served is important for providing culturally competent care.

Criminal Justice Reform

Reforming criminal justice approaches to substance use can improve outcomes and reduce the burden on the justice system. Alternatives to incarceration such as drug courts, diversion programs, and treatment-focused probation can be more effective than punishment alone. Ensuring access to treatment in correctional settings and supporting successful reentry are also critical.

Addressing Social Determinants of Health

Substance use disorders do not occur in a vacuum. Social determinants of health including poverty, housing instability, unemployment, lack of education, and limited access to healthcare all contribute to substance use risk and create barriers to recovery. Comprehensive approaches to addressing SUDs must include efforts to address these underlying social factors.

Recovery and Long-Term Management

Recovery from substance use disorders is a long-term process that extends well beyond initial treatment. Understanding recovery as an ongoing journey rather than a single event is important for supporting individuals in maintaining the changes they have made.

Defining Recovery

Recovery is often defined as a process of change through which individuals improve their health and wellness, live self-directed lives, and strive to reach their full potential. This definition recognizes that recovery is about more than just abstinence from substances—it encompasses improvements in physical health, mental health, relationships, employment, housing, and overall quality of life.

Recovery looks different for different people. For some, it means complete abstinence from all substances. For others, it may involve medication-assisted treatment that allows them to function normally while managing cravings and preventing relapse. The key is that individuals are moving toward their goals and experiencing improvements in their lives.

Recovery Support Services

Recovery support services help individuals maintain recovery after formal treatment ends. These services may include peer support groups, recovery coaching, sober living environments, employment assistance, educational support, and help with legal issues or family reunification.

Recovery-oriented systems of care recognize that recovery is supported by a network of services and supports rather than a single treatment episode. Building communities that support recovery requires coordination among treatment providers, mutual-help organizations, healthcare systems, employers, housing providers, and other community resources.

Relapse Prevention

Relapse prevention is a critical component of long-term recovery. This involves identifying personal triggers for substance use, developing coping strategies for managing cravings and high-risk situations, building a support network, and creating a lifestyle that supports recovery.

If relapse occurs, it should be viewed as an opportunity to learn and adjust the recovery plan rather than as a failure. Many people experience one or more relapses before achieving sustained recovery. Each relapse can provide information about what strategies are working and what needs to change.

Building a Recovery-Oriented Life

Successful long-term recovery typically involves building a life that is meaningful and rewarding without substances. This may include developing healthy relationships, pursuing education or career goals, engaging in hobbies and activities that provide enjoyment and purpose, and contributing to the community.

Many people in recovery find that helping others who are struggling with addiction becomes an important part of their own recovery. Whether through formal peer support roles, sponsorship in mutual-help groups, or simply being available to support friends and family members, giving back can reinforce recovery and provide a sense of purpose.

Emerging Research and Future Directions

The field of addiction science continues to evolve, with new research providing insights into the mechanisms of addiction and pointing toward innovative prevention and treatment approaches.

Precision Medicine Approaches

Precision medicine aims to tailor prevention and treatment approaches based on individual genetic, biological, and environmental factors. As our understanding of the genetic and neurobiological factors that influence addiction risk and treatment response grows, it may become possible to predict which treatments will be most effective for which individuals and to identify people at highest risk who would benefit from preventive interventions.

Novel Medications

Research continues on developing new medications for substance use disorders. This includes medications for conditions that currently lack effective pharmacological treatments, such as stimulant use disorders, as well as improved formulations of existing medications that may be more effective or have fewer side effects.

Technology-Based Interventions

Technology offers new opportunities for delivering prevention and treatment services. Mobile apps can provide recovery support, track symptoms, deliver interventions, and connect individuals to resources. Telehealth has expanded access to treatment, particularly for people in rural areas or those with transportation or scheduling challenges. Virtual reality and other emerging technologies are being explored as tools for treatment and relapse prevention.

Understanding Polysubstance Use

A 2026 SAMHSA report found that the use of multiple substances in a single month is increasingly common, complicating detox and recovery pathways for modern patients. As polysubstance use becomes more prevalent, research is needed to understand the unique challenges it presents and to develop effective treatment approaches for individuals using multiple substances.

Supporting Someone with a Substance Use Disorder

If someone you care about is struggling with a substance use disorder, there are ways you can help while also taking care of yourself.

Educate Yourself

Learning about substance use disorders, treatment options, and recovery can help you better understand what your loved one is experiencing and how you can support them. Understanding that addiction is a medical condition rather than a choice or moral failing can help you approach the situation with compassion rather than judgment.

Communicate with Compassion

Express your concerns in a non-judgmental way, focusing on specific behaviors you've observed and how they affect you rather than labeling or criticizing the person. Choose a time when the person is sober to have these conversations. Let them know you care about them and are willing to support them in getting help.

Encourage Treatment

Encourage your loved one to seek professional help and offer to assist them in finding treatment resources. This might include helping them research treatment options, making phone calls, arranging transportation, or attending appointments with them if they wish. However, remember that you cannot force someone to get treatment—they must be willing to participate for treatment to be effective.

Set Boundaries

While supporting your loved one, it's important to set healthy boundaries to protect your own wellbeing. This might mean not providing money that could be used for substances, not making excuses for their behavior, or limiting contact if their behavior becomes abusive or harmful to you. Setting boundaries is not about punishing the person but about taking care of yourself.

Seek Support for Yourself

Supporting someone with a substance use disorder can be emotionally draining and stressful. Support groups for family members, such as Al-Anon or Nar-Anon, can provide understanding, guidance, and support from others who have had similar experiences. Individual counseling can also help you process your feelings and develop healthy coping strategies.

Celebrate Progress

Recovery is a process with ups and downs. Acknowledge and celebrate positive steps, no matter how small. This might include entering treatment, attending support group meetings, maintaining abstinence for a period of time, or making other positive changes. Positive reinforcement can help motivate continued progress.

Resources and Getting Help

If you or someone you know is struggling with a substance use disorder, help is available. Numerous resources can provide information, support, and connections to treatment.

National Helplines

The Substance Abuse and Mental Health Services Administration (SAMHSA) operates a National Helpline at 1-800-662-HELP (4357), which provides free, confidential information and referrals to local treatment facilities, support groups, and community-based organizations 24 hours a day, 365 days a year. The 988 Suicide and Crisis Lifeline (call or text 988) provides support for people in mental health or substance use crisis.

Online Resources

Several websites provide valuable information and resources for individuals seeking help with substance use disorders. The SAMHSA website offers extensive information about substance use disorders, treatment options, and a treatment locator tool. The National Institute on Drug Abuse (NIDA) provides research-based information about drugs and addiction. The American Psychiatric Association offers resources about mental health and substance use disorders.

Local Resources

Many communities have local resources including treatment centers, community mental health centers, hospital-based programs, and mutual-help groups. Your primary care physician can also be a good starting point for discussing concerns about substance use and getting referrals to appropriate services.

Emergency Situations

If someone is experiencing an overdose or other medical emergency related to substance use, call 911 immediately. Signs of opioid overdose include unconsciousness, very slow or stopped breathing, blue or gray lips or fingernails, and inability to wake the person. If naloxone is available, administer it according to instructions while waiting for emergency services to arrive.

Conclusion: A Path Forward

Substance use disorders represent a complex public health challenge that affects millions of individuals and families. However, the evidence is clear: SUDs are treatable medical conditions, and recovery is possible. NIDA-funded research has led to effective prevention and treatment approaches, helping millions of Americans lead healthier lives, reduce their overdose risk, and recover from SUD.

Progress in addressing substance use disorders requires action at multiple levels. At the individual level, it means recognizing SUDs as health conditions deserving of compassion and evidence-based treatment rather than judgment and punishment. At the community level, it means creating environments that support prevention, treatment, and recovery while reducing stigma and barriers to care. At the policy level, it means ensuring adequate funding for treatment and prevention services, enforcing insurance parity, addressing social determinants of health, and implementing evidence-based policies.

The AMA emphasizes that continued progress will require coordinated action among physicians, policymakers, insurers, and communities to remove barriers to care, respond rapidly to emerging threats, and save lives. This collaborative approach, combining the efforts of healthcare providers, researchers, policymakers, community organizations, and individuals with lived experience, offers the best path forward.

The recent decline in overdose deaths demonstrates that progress is possible when evidence-based interventions are implemented at scale. Expanding access to medication-assisted treatment, increasing naloxone availability, reducing stigma, improving insurance coverage, and investing in prevention and treatment services can save lives and help millions of people achieve recovery.

For individuals struggling with substance use disorders, the message is one of hope: treatment works, recovery is possible, and help is available. For families and communities, the call is to approach substance use disorders with compassion, understanding, and support. For policymakers and healthcare systems, the imperative is to ensure that evidence-based prevention and treatment services are accessible to all who need them.

By continuing to advance our understanding of substance use disorders through research, implementing evidence-based prevention and treatment approaches, addressing systemic barriers to care, and supporting individuals and families affected by SUDs, we can make meaningful progress in addressing this critical public health challenge. The path forward requires sustained commitment, adequate resources, and a recognition that every person affected by a substance use disorder deserves access to effective, compassionate care.