Overview
Opioids are drugs that act on the nervous system to reduce pain and can also cause feelings of relaxation or euphoria. They include prescription medicines such as morphine, oxycodone, hydrocodone, fentanyl, and codeine, as well as illegal drugs such as heroin. Because they affect breathing and brain function, opioids can cause life-threatening overdose. Long-term or repeated use can lead to tolerance, physical dependence, and opioid use disorder.
Key Symptoms
Problems linked to opioid use can include strong cravings, difficulty controlling use, sleepiness, confusion, pinpoint pupils, constipation, nausea, and slowed breathing. A person having withdrawal may have body aches, diarrhea, sweating, anxiety, yawning, runny nose, and trouble sleeping after stopping or cutting down. Signs of overdose can include very slow or stopped breathing, blue or gray lips, unresponsiveness, and limp body. Symptoms can vary depending on the type of opioid, dose, and whether other substances were used.
Causes and Risk Factors
Risk rises with higher doses, longer use, past substance use problems, mental health conditions, and use of opioids together with alcohol, benzodiazepines, or other sedating drugs. Illegal drug supplies may contain very potent synthetic opioids such as fentanyl, which greatly increases overdose risk. Some people start with prescribed opioids for pain, while others use non-prescribed opioids. Social stress, trauma, limited access to care, and unstable housing can also increase risk.
Who Is Affected
People of many ages and backgrounds can be affected by opioid use, dependence, overdose, or opioid use disorder. Risk can affect people taking opioids for short-term or long-term pain, people using non-prescribed pills, and people using heroin or other street drugs. Families, caregivers, and communities are also affected by overdose, infection risk, and social harms related to opioid misuse.
Prevention
If opioids are prescribed, take them only as directed and keep in close contact with the prescriber about benefits, side effects, and concerns. Do not share opioid medicines, and store them securely away from children, teens, and others. Avoid mixing opioids with alcohol or sedative medicines unless a clinician specifically reviews the combination. Community prevention also includes access to overdose education, naloxone, treatment services, and safe disposal of unused medicines.
Diagnosis and Tests
Healthcare professionals diagnose opioid-related problems by asking about symptoms, substance use, physical and mental health, and daily functioning. They may review prescription history, do a physical exam, and use screening questions or laboratory tests when needed. Diagnosis of opioid use disorder is based on patterns such as loss of control, cravings, continued use despite harm, and withdrawal or tolerance. If overdose is suspected, urgent assessment is needed right away.
Treatment Categories
Treatment depends on the situation and may include emergency overdose care, treatment for withdrawal, and long-term care for opioid use disorder. Evidence-based care often includes medications for opioid use disorder together with counseling, mental health support, and social services. Treatment can happen in clinics, hospitals, community programs, or through primary care, depending on local resources. Recovery is possible, but relapse can happen, so ongoing support is important.
Living With It
Living with opioid dependence or opioid use disorder can affect work, relationships, mood, sleep, and physical health. Many people benefit from a care plan that includes regular follow-up, support from trusted people, treatment for mental health conditions, and safer-use or overdose-prevention education. Stigma can make it harder to seek help, so respectful, nonjudgmental care matters. Family members may also need information and support.
When to Seek Medical Care
Seek medical care if opioid use is becoming hard to control, causing withdrawal symptoms, affecting work or family life, or leading to falls, confusion, constipation, infections, or mood changes. Get help if you think prescribed opioids are no longer helping as expected or if side effects are becoming difficult to manage. A healthcare professional can review risks, discuss treatment options, and help plan safer care.
When It May Be an Emergency
This may be an emergency if someone is very hard to wake, is not breathing normally, has blue or gray lips or nails, makes choking or gurgling sounds, or collapses after using opioids. It is also urgent if opioids were taken with alcohol, sleeping pills, or other drugs that slow breathing. If overdose is possible, call emergency services immediately and use naloxone if it is available according to local guidance.