Opioid Use Disorder: Symptoms, Overdose Risk and Treatment

Opioid use disorder can involve prescribed or illicit opioids

Opioid use disorder may develop with heroin, illegally manufactured fentanyl, prescription pain medicines or a combination. The diagnosis is based on impaired control, craving, hazardous use and continued use despite harm. Taking a prescribed opioid or developing physical dependence does not automatically establish addiction, but both warrant careful review when risk is increasing.

The current drug supply can be unpredictable. Counterfeit tablets may resemble legitimate medicines while containing fentanyl or another potent opioid. A person may therefore be exposed to a much higher dose than intended.

Signs of impaired control

• Taking more or using for longer than intended
• Repeated unsuccessful efforts to reduce
• Spending substantial time obtaining, using or recovering
• Using to prevent withdrawal or feel normal
• Continuing after overdose, injury, infection or relationship harm
• Prioritising opioids over work, health or caring responsibilities
• Obtaining pills from unregulated sources or several prescribers

Some people conceal the pattern while maintaining employment and housing. The absence of visible collapse does not remove overdose risk.

Overdose risk

Opioids can slow or stop breathing. Warning signs include inability to wake, slow or shallow breathing, gurgling or unusual snoring, blue or grey lips and very small pupils. Call emergency services, give naloxone if available and provide rescue breathing or cardiopulmonary resuscitation according to training.

More than one naloxone dose may be needed, particularly with fentanyl. Stay with the person because sedation can return. Naloxone is safe to give when opioid overdose is suspected, even if another substance may also be involved.

Factors that increase overdose danger

Risk rises after abstinence, detoxification, incarceration or hospital admission because tolerance can fall. Combining opioids with benzodiazepines, alcohol, pregabalin, gabapentin or other sedatives can further suppress breathing. Using alone delays rescue.

Potency and contents are uncertain in illicit markets. Fentanyl may be present in heroin, counterfeit pills, cocaine or methamphetamine. Naloxone, not using alone and drug-checking where available reduce risk but do not make use safe.

Physical dependence and withdrawal

Opioid withdrawal can involve anxiety, muscle aches, sweating, yawning, abdominal cramps, diarrhoea, vomiting and insomnia. It is usually not life-threatening in a healthy adult, but dehydration, pregnancy, other illness and co-occurring withdrawal can create serious complications. The severe discomfort often drives rapid return to use.

The period after withdrawal is particularly dangerous because tolerance may be lower. Detox alone therefore increases risk when it is not linked to medication and continuing treatment. See opioid withdrawal.

Assessment

A clinician asks about the opioid, route, frequency, last use, overdose history, withdrawal, other substances, medicines and previous treatment. They assess breathing, infection, pregnancy, pain, mental health, housing and safeguarding. Testing can support the history but may not detect every synthetic opioid.

The assessment should establish whether medication treatment can begin and which setting is safe. A person does not need to complete detox before receiving evidence-based opioid treatment.

Medication treatment

Medications such as methadone and buprenorphine can reduce illicit opioid use and mortality risk. Naltrexone is another option for selected patients after an appropriate opioid-free period. Choice depends on clinical history, access, preference, pregnancy, other medicines and local regulation.

Medication is not replacing one addiction with another. A stable, monitored treatment can reduce craving, prevent withdrawal and support functioning without the cycle of intoxication and unpredictable supply. Stopping effective medication prematurely can increase relapse and overdose risk. Read medications for opioid use disorder.

Psychological and practical treatment

Medication works best within a broader plan that addresses triggers, trauma, depression, anxiety, pain, housing and relationships. Cognitive behavioural approaches, contingency management, peer support and family work may be included according to need and preference.

Infection treatment, wound care, hepatitis and HIV services, dental care and primary care are important. Practical barriers such as transport, identification and childcare can determine whether a person remains in treatment.

Pain and opioid use disorder

People with opioid use disorder can still experience acute or chronic pain. Dismissing pain may damage trust and increase unsafe self-treatment. Addiction and pain clinicians should coordinate a plan that uses appropriate non-opioid and, when necessary, opioid strategies with clear monitoring.

Tell every healthcare professional about medication treatment so that surgery, emergency care and prescribing can be managed safely. Do not stop methadone or buprenorphine without specialist advice.

Pregnancy

Pregnancy requires prompt specialist assessment. Abrupt withdrawal can create risks, and medication treatment is often recommended within coordinated obstetric and addiction care. The plan should address prenatal health, infections, mental health, pain and neonatal care without stigma.

Fear of judgement can delay care. Confidential, respectful treatment improves safety for both parent and baby.

Choosing outpatient, residential or hospital care

Many people receive effective medication treatment as outpatients. Residential care may be considered when housing is unsafe, psychiatric risk is high or structured separation is needed. Hospital care is appropriate for overdose, severe infection, unstable pregnancy or other acute illness.

A private or luxury rehab should continue or initiate evidence-based opioid medication when clinically indicated. Verify prescribing, naloxone, overnight medical cover, emergency transfer and return-home continuity. A programme that requires medication cessation for ideological reasons may increase risk.

Relapse and continuing care

A return to opioid use is an emergency risk because tolerance and supply may have changed. The response should include naloxone, review of medication dose and adherence, and rapid increase in support. Discharge from care after a lapse can be dangerous.

Recovery can include stable medication, abstinence from illicit opioids, improved health, housing and relationships. Treatment duration should follow benefit and risk rather than a fixed timetable. The general framework is described in addiction treatment: what works.