Opioid addiction explained: signs, diagnosis, treatment and recovery

Signs of opioid addiction

The clearest signs are loss of control over use and carrying on despite clear harm. Doctors check a set of criteria from the DSM-5 or ICD-11 over the past 12 months. The more criteria apply, the more severe the disorder.

Family members often notice changes before the person using does. Typical signs include pinned pupils, drowsiness, nodding off mid-conversation, constipation, mood swings and secrecy. Money problems, missing medicines and several prescribing doctors are further warning signs.

• Using more or for longer than planned
• Failed attempts to cut down
• Strong cravings
• Much time spent getting, using or recovering
• Neglected work, study or family duties
• Giving up hobbies and friendships
• Using in risky situations, such as before driving
• Needing higher doses for the same effect
• Withdrawal symptoms when stopping

Opioid withdrawal symptoms

Opioid withdrawal is very unpleasant and is best managed with medical support. Symptoms usually start within 12 hours of the last heroin use and within 30 hours of the last methadone dose (MedlinePlus, 2026). Long-acting opioids give a later, slower withdrawal.

Early symptoms include agitation, anxiety, muscle aches, insomnia, sweating and yawning (MedlinePlus, 2026). Later symptoms include stomach cramps, diarrhoea, dilated pupils, goosebumps, nausea and vomiting (MedlinePlus, 2026). Dehydration is the main physical risk. Craving and low mood can last for weeks.

Withdrawal is easier and safer under medical care. Doctors use agonist medication or symptom relief to reduce distress. Our guide on what happens during medical detox describes the process day by day.

Long-term effects and dangers

Long-term opioid use affects the body, the mind and daily life. Overdose is the most serious danger. The risk rises further when opioids are combined with alcohol, benzodiazepines or sleeping tablets.

Physical effects build up with regular use. Injecting adds the risk of HIV, hepatitis C, abscesses and heart valve infections. Psychological effects include low mood, anxiety and a narrowing of life around the drug. Social effects often follow: debt, job loss, legal problems and strained relationships. Many of these effects ease with stable treatment.

• Chronic constipation and dental problems
• Lower sex hormones, reduced libido and irregular periods
• Disturbed sleep and breathing problems during sleep
• Greater sensitivity to pain over time
• Depression, anxiety and social withdrawal

Overdose: signs and what to do

An opioid overdose is a medical emergency. WHO describes three key signs: pinpoint pupils, unconsciousness and difficulty breathing (WHO, 2026). Other signs are blue lips, gurgling or snoring sounds and no response to your voice.

In Switzerland, call 144 for an ambulance (ch.ch, 2026). The poison information line is 145. WHO recommends that naloxone be available to people likely to witness an opioid overdose (WHO, 2026). Ask a doctor or pharmacist about naloxone if someone in your home uses opioids.

Risk rises sharply when someone uses again after a break. WHO lists resumption of use after abstinence, for example after detox, prison or stopping treatment, as a risk factor (WHO, 2026).

• Call 144 and say the person is not breathing normally
• Give naloxone if available and follow the instructions
• Place the person in the recovery position if breathing
• Stay with them until help arrives

Causes and risk factors

Opioid use disorder develops from a mix of inherited risk, mental health, pain, life circumstances and repeated use. There is no fixed time in which it develops. It can build over months of daily prescribed use or faster with heroin or fentanyl.

Known risk factors include a family history of addiction, early first use, other substance use and easy access to opioids. Chronic pain, depression, anxiety, trauma and ADHD also raise the risk. Social isolation, unemployment and prison stays add to it.

How doctors diagnose it

Doctors diagnose opioid use disorder through a conversation, a structured assessment and a physical examination. They ask which opioids you use, how much, how often and by which route. They ask what happens when you stop and check the answers against the DSM-5 or ICD-11 criteria.

A urine or blood test confirms recent use. The doctor checks for infections such as hepatitis C and HIV if you have injected. They also screen for depression, anxiety, trauma, chronic pain and other substances. These findings shape the treatment plan.

How is opioid addiction treated?

It is treated with medication, psychological therapy and social support, matched to your situation. According to WHO, maintenance with methadone or buprenorphine is the best-evidenced treatment for opioid dependence (WHO, 2026).

Agonist therapy also protects life. Pooling 36 cohort studies, researchers found people were less than half as likely to die from any cause while in agonist treatment as when out of it (risk ratio 0.47) (JAMA Psychiatry, 2021). A withdrawal programme aiming at full abstinence is another option for some people. Detox alone rarely prevents a return to use (NIDA, 2018).

NIDA's guidance is that three months of treatment is usually the minimum needed to cut down or stop (NIDA, 2018). Specialist and private clinics are listed on our page about opioid addiction treatment in Switzerland.

• Methadone or slow-release oral morphine maintenance
• Buprenorphine maintenance
• Heroin-assisted treatment for severe cases
• Supervised withdrawal followed by residential therapy
• Cognitive behavioural therapy and motivational interviewing
• Peer support, such as Narcotics Anonymous

Opioid treatment in Switzerland

Switzerland combines prevention, therapy, harm reduction and law enforcement, an approach known as the four pillars. Under the Narcotics Act, both federal and cantonal authorities must work in each of these areas (Fedlex: BetmG Art. 1a). This approach makes agonist therapy and harm reduction part of standard care.

Opioid agonist therapy reached 14,995 people in Switzerland in 2024, and seven in ten of them had been treated for 10 years or longer (Addiction Switzerland for FOPH, 2024). Doctors need a cantonal licence to prescribe opioids for dependence (Fedlex: BetmG Art. 3e).

Prescribed heroin requires a federal licence and is only for people who did not benefit from, or cannot use, other treatments (Fedlex: BetmG Art. 3e). Around 1,800 patients were treated with prescribed heroin in 2024, across 22 specialised outpatient centres (FOPH, 2024).

Pain, depression and trauma

Opioid dependence rarely comes alone. It often occurs together with chronic pain, depression, anxiety or past trauma. Swiss addiction services report that co-occurring mental disorders are frequent among their clients, most often depression (Addiction Switzerland, 2024).

Each condition can drive the other. Untreated pain makes stopping opioids harder. Depression and trauma raise craving and relapse risk. Good care treats them together, with pain specialists, psychiatrists and trauma therapists in one team. Our page on dual diagnosis treatment explains how Swiss clinics organise this.

Does insurance pay?

Swiss basic health insurance covers inpatient treatment in hospitals on a cantonal hospital list, on the general ward (Fedlex: KVG Art. 39). You pay a yearly deductible plus 10% of costs above it (Fedlex: KVG Art. 64).

The 10% co-payment is capped at CHF 700 a year for adults (Fedlex: KVV). Adults also pay CHF 15 per hospital day (Fedlex: KVV). Private clinics and single rooms are usually self-paid or need supplementary insurance. Our guide to the cost of rehab in Switzerland sets out typical price bands.

What families can do

Families can make a real difference to whether someone enters and stays in treatment. A systematic review found that Community Reinforcement and Family Training (CRAFT) led about two-thirds of treatment-resistant individuals into treatment (Addiction, 2010).

Keep naloxone at home and learn the overdose signs. Speak calmly and without blame. Protect your own health and finances. SafeZone.ch offers free, anonymous online counselling for relatives as well as users (SafeZone.ch, 2026). Our guide on how to help a loved one into rehab explains how to start the conversation.

Recovery from opioid addiction step by step

Recovery is a long-term process, often with more than one episode of treatment (NIDA, 2018). The steps below show a typical path. The pace differs for each person.

A return to use does not mean treatment has failed (NIDA, 2020). It means the plan needs adjusting. The same staged approach applies to other substances, as our guide on alcohol addiction signs and recovery shows.

• Step 1: see a family doctor or addiction service for an assessment
• Step 2: make an overdose plan and keep naloxone close
• Step 3: start agonist therapy or a supervised withdrawal
• Step 4: begin therapy for the addiction, pain, mood or trauma
• Step 5: rebuild sleep, routine, work and relationships
• Step 6: keep aftercare, check-ins and peer support for at least a year
• Step 7: review the relapse plan whenever life changes

If you would like help finding a clinic for opioid addiction that fits your situation, we can shortlist suitable Swiss options, free and confidential.