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Opioids and Opioid Use Disorder (OUD)
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Substance Use Disorders

Opioids and Opioid Use Disorder (OUD)

Opioids are powerful pain relievers that carry significant risks of addiction and respiratory failure, requiring careful management and awareness of overdose signs.

What are opioids?

Opioids are narcotics that include prescription pain relievers like oxycodone, hydrocodone, fentanyl, and tramadol, as well as the illegal drug heroin. They may be derived from the opium plant or synthesized in a lab. They are prescribed for severe pain related to injury, surgery, cancer, or chronic conditions.

Side effects and risks

Common side effects include drowsiness, mental fog, nausea, and constipation. The most severe risk is slowed breathing, which can lead to fatal overdose. Signs of an overdose include:

  • Very small pupils
  • Falling asleep or loss of consciousness
  • Slow, shallow breathing
  • Choking or gurgling sounds
  • Vomiting
  • Limp body
  • Pale, blue, or cold skin
  • Faint heartbeat
  • Purple lips and fingernails

What is opioid use disorder (OUD)?

OUD is a problematic pattern of opioid use that causes distress and interferes with daily life. It is also referred to as opioid dependence or addiction. Addiction is a chronic brain disease characterized by compulsive drug seeking despite harmful consequences. Misuse—such as taking higher doses, using more frequently, or using someone else's medication—significantly increases the risk of OUD.

Increased misuse has led to public health concerns, including neonatal abstinence syndrome (NAS) in babies exposed to opioids during pregnancy, and a higher prevalence of heroin use as individuals switch from prescription opioids to cheaper, more accessible alternatives.

Treatment

Medications for opioid use disorder (MOUD) are effective treatments that help patients stop using, manage withdrawal, and cope with cravings. These are often paired with behavioral therapy, counseling, and social support. Naloxone is a critical medication used to reverse opioid overdoses and prevent death.

Prevention

To prevent complications, always follow your doctor’s instructions, never share your medication, and contact your healthcare provider immediately if you have concerns about your prescription.

Frequently Asked Questions

Opioid exposure in utero can lead to neonatal abstinence syndrome (NAS), where the newborn experiences withdrawal symptoms such as tremors, irritability, poor feeding, and breathing problems. Early detection and specialized care are essential for affected infants.
Call emergency services right away, administer naloxone if you have it, and place the person on their side to keep the airway clear. Stay with them until help arrives, and keep breathing and pulse checks until emergency responders take over.
Key signs include very small pupils, extreme drowsiness or unconsciousness, slow or shallow breathing, a limp body, pale or blue skin, and a faint or irregular heartbeat. If you see any of these, act immediately.
Effective treatments include medication‑assisted therapy such as methadone, buprenorphine, or naltrexone, combined with counseling, behavioral therapy, and social support services. These approaches help manage withdrawal, reduce cravings, and improve long‑term recovery outcomes.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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