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Health condition · Clinically reviewed

Drug addiction, harm reduction, substitution and a path to recovery.

Substance use disorder is a chronic, relapsing brain disorder - treatable with medicine, therapy and support. This guide explains the UK stepped-care approach in plain English.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, the UK Drug Misuse and Dependence (Orange Guidelines) and peer-reviewed sources.

  • 03

    Current for 2026

    Reflects modern UK practice including take-home naloxone, long-acting injectable buprenorphine and dual-diagnosis care.

Key facts

Drug addiction at a glance.

The essentials, in plain English - what it is, why it happens and how UK services approach it today.

  • What it is

    A chronic, relapsing brain disorder defined by compulsive substance use despite harm, meeting DSM-5-TR or ICD-11 criteria.

  • How common

    Around one in eleven UK adults reports a substance use disorder in the past year across all drug classes.

  • Drug classes

    Opioids, stimulants, sedative-hypnotics, cannabinoids, hallucinogens, dissociatives, inhalants and novel psychoactive substances.

  • The biology

    The mesolimbic dopamine reward pathway is hijacked, prefrontal control weakens and stress systems drive craving and relapse.

  • What works

    Opioid substitution therapy, harm reduction, structured psychosocial care and relapse-prevention medicines all have strong evidence.

  • Recovery is possible

    With the right combination of medicine, therapy and support, most people improve and many achieve sustained remission.

Why this guide matters

A treatable illness, not a moral failing.

The reward circuitry of the brain is hijacked, control weakens and stress systems drive craving. That is the biology behind addiction - and the reason it responds to medical care.

  • Harm reduction saves lives

    Take-home naloxone, needle exchange and BBV testing keep people alive long enough to reach recovery.

  • Substitution beats abstinence-first

    For opioid dependence, methadone and buprenorphine cut overdose death and give the brain time to heal.

  • Recovery is a marathon

    Relapse is part of the illness, not a failure. Long-term care, mutual aid and family support all improve outcomes.

How the assessment is made

From first contact to a written plan.

The steps a UK community drug and alcohol service or specialist clinic will normally follow, in order.

  1. 01

    Assessing

    Brief intervention and screening

    AUDIT for alcohol, DAST for drugs and other validated tools identify who needs a fuller assessment.

  2. 02

    Assessing

    Full substance history

    Every drug used, route, quantity, duration, last use, previous treatment episodes and periods of abstinence.

  3. 03

    Assessing

    Medical and psychiatric review

    Comorbid depression, anxiety, psychosis, trauma, ADHD and physical illness are the rule, not the exception.

  4. 04

    Confirming

    Risk assessment

    Overdose risk, suicide risk, blood-borne virus exposure, safeguarding and child-protection concerns are documented explicitly.

  5. 05

    Confirming

    Investigations

    Urine toxicology, hair analysis where indicated, BBV screen (HIV, hepatitis B and C), pregnancy test, ECG and physical examination.

  6. 06

    Planning

    Formulation and plan

    A written plan covering harm reduction, substitution or detox, psychosocial support and coordinated MDT input.

  7. 07

    Planning

    Follow-up and review

    Frequent early review, urine screens, dose titration and stepped escalation of therapy as stability is built.

Typical timeline: from first contact to a stable care plan in days, not weeks.

Features

What substance use disorder looks like.

The DSM-5 clusters (impaired control, social impairment, risky use, tolerance and withdrawal), plus the medical, mental-health and social features that shape care.

  • Impaired control

    Using more than intended, unable to cut down, spending a great deal of time using or recovering, and strong craving.

  • Social impairment

    Failure to meet role obligations at work, home or school, and continued use despite relationship and social harm.

  • Risky use

    Use in physically hazardous situations, and continued use despite clear physical or psychological consequences.

  • Tolerance and withdrawal

    Needing more for the same effect, and a characteristic withdrawal syndrome relieved by further use.

  • Medical complications

    Blood-borne viruses, endocarditis, DVT, cellulitis, injection-site injury and organ damage from chronic use.

  • Mental-health impact

    Depression, anxiety, substance-induced psychosis, self-harm and elevated suicide risk are common.

  • Family and legal impact

    Financial strain, safeguarding concerns for children, offending behaviour and employment loss frequently coexist.

  • Red flag - overdose

    Opioid overdose causes respiratory depression. Naloxone reverses it and every at-risk person should carry it.

Treatment

How drug addiction is treated in the UK.

Harm reduction first, opioid substitution or planned detox next, and structured psychosocial care and relapse-prevention medicines to hold the gains.

  • Harm reduction

    Needle and syringe programmes, safer-injection education, wound care, BBV testing and hepatitis vaccination reduce death and disease.

  • Take-home naloxone

    Nyxoid nasal spray or Prenoxad intramuscular kits given to the person and their family so overdose can be reversed on the spot.

  • Methadone

    Oral opioid substitution, titrated carefully and supervised daily at first. Long half-life supports steady, once-daily dosing.

  • Buprenorphine and Suboxone

    Partial-agonist substitution with a ceiling on respiratory depression, useful when overdose risk is high or motivation for reduction is strong.

  • Long-acting injectable buprenorphine

    Sublocade or Buvidal given monthly by subcutaneous injection under specialist care, removing the daily pharmacy trip.

  • Medically supervised detoxification

    Opioid detox with buprenorphine and lofexidine, benzodiazepine tapers and alcohol regimens delivered in community or inpatient settings.

  • Relapse-prevention medicines

    Oral or injectable naltrexone for opioid and alcohol relapse prevention, plus acamprosate and disulfiram in alcohol use disorder.

  • Psychosocial therapy

    CBT, contingency management, motivational interviewing, 12-step, SMART Recovery and structured keyworking form the backbone of care.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist team knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Drug misuse in over 16s: psychosocial interventions (CG51) and opioid detoxification (CG52).

  • Department of Health and Social Care. Drug misuse and dependence: UK guidelines on clinical management (Orange Guidelines).

  • NICE. Coexisting severe mental illness and substance misuse (NG58).

  • Public Health England. Take-home naloxone and harm-reduction guidance.

Red flags

When drug addiction needs urgent care.

Most people are managed by their community team. These are the situations that need same-day, hospital or specialist input.

  • Suspected opioid overdose

    Pinpoint pupils, slow or absent breathing and unresponsiveness. Give naloxone, call 999 and start basic life support.

  • Suicidality or self-harm

    Active suicidal thoughts, a plan or recent attempt need urgent mental-health crisis assessment, not a routine appointment.

  • Severe withdrawal

    Alcohol or benzodiazepine withdrawal can seize and kill. Do not stop abruptly at home. Seek same-day medical review.

  • Injecting complications

    Spreading cellulitis, abscess, endocarditis features or a hot swollen limb suggesting DVT need urgent hospital assessment.

  • Pregnancy

    Pregnancy with drug dependence needs specialist perinatal drug services, obstetrics and a neonatal plan for withdrawal.

  • Safeguarding concerns

    Children in the household or a vulnerable adult at risk trigger a safeguarding referral alongside treatment.

  • New psychosis

    First-episode psychosis, whether or not substance-induced, needs urgent psychiatric assessment and early-intervention referral.

  • GHB or GBL withdrawal

    Rapid onset, delirium and autonomic instability. Manage in a specialist inpatient setting, not at home.

  • Ketamine bladder

    Urinary frequency, urgency and pain in a regular ketamine user needs urology and specialist addiction input to prevent permanent damage.

Living with it

A treatable illness, one day at a time.

Four things make the biggest difference day to day - carry naloxone, keep your appointments, look after your body and use the support around you.

A quiet reminder

Relapse is not failure, it is part of the illness.

Come back to services early, adjust the plan and keep going. Most people who recover have relapsed along the way.

  1. 01 Reduce harm

    Carry naloxone

    If you use opioids or live with someone who does, keep naloxone within reach. It buys the minutes an ambulance needs.

  2. 02 Stay engaged

    Turn up, even on hard days

    Treatment works best when appointments are kept. Missed reviews are the single biggest predictor of relapse and overdose.

  3. 03 Look after body

    Test, vaccinate, treat

    Regular BBV testing, hepatitis A and B vaccination and prompt treatment for hepatitis C protect your future health.

  4. 04 Support

    You do not do this alone

    Community services, mutual-aid groups (NA, AA, SMART Recovery) and family support (Al-Anon, Adfam) all improve outcomes.

Frequently asked

Everything we get asked about drug addiction.

Quick answers on substitution, naloxone, detox, ketamine harm and where to turn.

  • Is drug addiction a choice or a disease?

    Neither label captures it fully. Modern neuroscience treats substance use disorder as a chronic, relapsing brain disorder shaped by genetics, early experience, mental health and environment. People do not choose addiction, and recovery is real - but sustained recovery usually needs medical treatment and support, not willpower alone.

  • What is opioid substitution therapy?

    It is treatment with a long-acting opioid, usually methadone or buprenorphine, taken as prescribed to stabilise the brain, remove withdrawal and craving, and let someone rebuild their life. It is the single most evidence-based treatment for opioid dependence and it reduces overdose deaths, criminal activity and blood-borne virus transmission.

  • What is naloxone and who should carry it?

    Naloxone temporarily reverses an opioid overdose by displacing opioids from brain receptors. In the UK it is available as Nyxoid nasal spray or Prenoxad intramuscular kits. Anyone who uses opioids, and their family and friends, should have a take-home kit and know how to use it. It is free from drug services.

  • Can I detox at home?

    It depends on the substance. Stimulant and cannabis withdrawal is uncomfortable but not dangerous. Opioid detox at home is possible under medical supervision. Alcohol, benzodiazepine and GHB/GBL withdrawal can be fatal and should never be stopped abruptly without a proper medical plan. Ask a clinician which category your use falls into before you cut down.

  • What about ketamine and its effect on the bladder?

    Regular ketamine use damages the bladder wall, causing frequency, urgency, pain and sometimes irreversible shrinkage. UK use has risen and so has this complication. If you use ketamine and have any urinary symptoms, ask for urology and specialist addiction input early. Reducing or stopping use is the most important step.

  • Where do I get help in the UK?

    Your GP can refer you to your local NHS-commissioned community drug and alcohol service. Providers include Change Grow Live, Turning Point and WithYou. Specialist private options include the Priory, UKAT and Castle Craig. In an emergency call 999. If you feel suicidal, contact 111, Samaritans on 116 123 or your local mental-health crisis team.

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