Opioid Addiction: Signs, Risk Factors, and Treatment Options

Opioid use disorder, the clinical name for what most people call opioid addiction, can start with a prescription for pain and can take hold in anyone who keeps taking opioids. This guide explains how it is recognized, what withdrawal from opioids involves, and which medications and counseling are used. It also covers why fentanyl is so much stronger than other opioids, what gets mixed into the illegal drug supply alongside it, and what to do when someone shows the signs of an overdose.

What Is Opioid Addiction?

The everyday term for opioid use disorder (OUD) is opioid addiction: ongoing opioid use someone cannot manage or stop, even as it damages their health, relationships or work. The path in may be a legitimate prescription, or it may be illicit opioids such as heroin or fentanyl.

Opioids form a drug class spanning prescription painkillers, heroin, and lab-made synthetics such as fentanyl. Hydrocodone, oxycodone, oxymorphone, morphine, codeine and fentanyl are among the prescription opioid medications. These drugs act on opioid receptors concentrated in the pain-processing areas of the brain and spinal cord, in a system that also shapes mood, stress and reward.

Physical dependence is not the same as addiction. Tolerance and withdrawal alone do not count as signs of OUD when a person takes opioids solely under appropriate medical supervision. When that loss of control involves a prescribed medication, it is one form of prescription drug addiction.

The Drug Enforcement Administration (DEA) places heroin in Schedule I, its category for drugs with no currently accepted medical use and a high potential for misuse. Most prescription opioids are Schedule II, the DEA’s class for drugs with a high potential for misuse that can lead to severe psychological or physical dependence; examples include oxycodone (OxyContin), fentanyl, methadone and hydrocodone combination products such as Vicodin.

About 4.0 million people 12 and older met the criteria for an opioid use disorder during the past year in 2025, and 2.4% of people (6.9 million) misused prescription opioids over that same stretch, according to the Substance Abuse and Mental Health Services Administration (SAMHSA).

Signs and Symptoms of Opioid Addiction

The signs of opioid addiction show up in how a person acts, how their body responds and how they feel. Someone may take more of a drug than they meant to, try and fail to cut back, crave it between doses, and keep using even as it causes problems at home, at work or with their health. A clinician diagnoses opioid use disorder using criteria from the DSM-5, the standard manual for mental health conditions.

Physical signs

Opioids slow the body down. They can also produce drowsiness, mental confusion, nausea, constipation, and respiratory depression, which is dangerously slowed breathing.

Physical signs can include:

People who inject opioids also face a higher risk of blood-borne infections, including HIV, hepatitis B and hepatitis C, and bacterial and fungal infections.

Behavioral signs

The diagnostic criteria describe a pattern of use that starts to take over daily life:

Psychological signs

A diagnosis of opioid use disorder means at least 2 of the 11 criteria have occurred within a year. Severity depends on how many apply:

Worried about someone? Noticing these signs of opioid addiction in a family member or friend is often the first step toward helping a loved one find care, and you do not need a diagnosis in hand to start that conversation.

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Go deeper: signs that differ by opioid are covered for oxycodone, heroin and fentanyl.

Opioid Withdrawal: Symptoms, Timeline and Safety

Opioid withdrawal is the flu-like illness that follows a drop in opioid use, whether a person stops or simply cuts back. Anxiety, aching muscles, sweating, a runny nose, vomiting and diarrhea are the usual complaints. Symptoms typically begin as soon as 12 hours after a person’s last heroin use and up to 30 hours after their last methadone exposure. They peak at 1 to 3 days and then ease over 7 to 10 days. With a long-acting opioid, the acute episode usually runs 14 days or longer.

Withdrawal rarely threatens life on its own, but dehydration from vomiting and diarrhea needs medical care, and the risk of overdose goes up sharply once tolerance has fallen.

Vomiting and diarrhea can cause dehydration and disturbances in body chemicals and minerals (electrolytes). When a person breathes slowly or not at all, has pinpoint pupils or cannot be woken, give naloxone if it is on hand and call 911.

Supervised medical detox makes the process safer and easier to get through. Buprenorphine and methadone relieve symptoms and can keep serving as longer-term treatment, and lofexidine, a non-opioid the Food and Drug Administration approved for this use, reduces withdrawal symptoms. The stretch right after detox is the riskiest: people who have just finished detox account for most opioid overdose deaths, so naloxone is worth keeping close by. The opioid withdrawal timeline sets out how symptoms shift day by day.

When to get medical help:

• Call 911 or go to the emergency room for an emergency, and do not delay.
• Anyone having thoughts of suicide or facing a mental health crisis can call or text 988, the Suicide & Crisis Lifeline.
• Contact a healthcare provider when using or withdrawing from opioids.

Treatment for Opioid Addiction

Opioid addiction is treatable: the strongest plans pair medication with counseling and support. The Food and Drug Administration (FDA) has approved three medications for opioid use disorder: methadone, buprenorphine and naltrexone, and all three have been shown to be safe and effective. Care can begin in detox, in a residential program or with outpatient visits, and a prescriber decides which medication fits.

Medications for opioid use disorder

Methadone is a synthetic opioid agonist that prevents withdrawal symptoms and relieves drug cravings. Buprenorphine is a partial opioid agonist, so it activates opioid receptors only partly. Naltrexone prevents other opioids from binding to and activating opioid receptors at all.

A prescriber weighs a person’s history, daily routine and goals when comparing options such as buprenorphine vs. methadone. Lofexidine is a separate case: it is used to ease withdrawal symptoms while a person stops opioids, and it is not a treatment for OUD itself.

Buprenorphine is easier to get than it was. Prescribers once needed a separate federal waiver, the X-waiver, to prescribe buprenorphine, and that ended in December 2022; the DEA now treats a standard registration for Schedule III drugs as enough. A 2024 SAMHSA rule also lets opioid treatment programs begin it through telehealth.

Behavioral therapies

Medication tends to do more when counseling comes with it. Many people taking OUD medication benefit from counseling as part of treatment, and psychosocial strategies such as contingency management, which rewards progress in recovery, can reduce dropout from medically supervised withdrawal. Contingency management and cognitive behavioral therapy are also among the behavioral treatments for prescription drug addiction. Counseling can be individual, or shared through group therapy and family therapy, which brings the people closest to someone into the process.

Treatment is offered at different levels of care, and the right starting point depends on what a person needs. Many people begin with medical detox, where withdrawal is managed with medical support, then continue in inpatient rehab, living at the program, or outpatient rehab, with scheduled visits while living at home.

If you are ready to take a step, you can find a rehab near you and call. Many people cover the cost of treatment with insurance or Medicaid, and how to pay for rehab is worth checking first. Knowing how to ask for help, and what to ask when you call a rehab, makes that first conversation easier. You can also call the SAMHSA National Helpline at 1-800-662-HELP (4357), a free, confidential, 24/7, 365-day-a-year treatment referral and information service in English and Spanish, or search FindTreatment.gov.

Go deeper: medication-assisted treatment (MAT), the approach that combines these medications with counseling.

Fentanyl and Overdose Risk

Fentanyl is a synthetic opioid, and it is 50 to 100 times stronger than morphine. Illegally made fentanyl figured in nearly 9 in 10 of the opioid overdose deaths recorded in 2024, according to the Centers for Disease Control and Prevention (CDC). Fentanyl often turns up mixed into other drugs, or pressed into pills that look real, so a person can take it without knowing. Naloxone can reverse such an overdose, and test strips let a person check a drug first.

Pharmaceutical fentanyl is made for medical use, mostly for severe pain. Illegally made fentanyl, sold on the illegal drug market, is the form behind most of the current risk.

Powdered fentanyl can be mixed with heroin, cocaine, and methamphetamine, and counterfeit pills pressed to resemble oxycodone or alprazolam are increasingly common.

Other hazards show up in the same supply. Xylazine is a veterinary sedative rather than an opioid, and it turned up in about 23% of the fentanyl powder that the Drug Enforcement Administration (DEA) seized in 2022, according to the Office of National Drug Control Policy. Naloxone does not reverse xylazine, though the CDC advises giving it in any suspected overdose, since opioids are usually involved, and wounds from xylazine use can be serious. Nitazenes, a further group of synthetic opioids, can match fentanyl’s strength or exceed it; naloxone still works on them, though it may take more than one dose. Medetomidine, an animal sedative, has been reported in at least 18 states, and withdrawal from it can be severe.

In 2024, 79,384 drug overdose deaths occurred in the United States, according to the CDC, and 54,045 of them involved any opioid. Synthetic opioids other than methadone accounted for 47,735, and the death rate for that category fell 35.6% from 2023 to 2024.

Naloxone reverses opioid overdoses, and Narcan 4 mg nasal spray became available without a prescription after Food and Drug Administration approval on March 29, 2023; more nonprescription sprays have followed, most recently in June 2026. Pinpoint pupils, discolored skin and a failure to wake up signal an opioid overdose: naloxone comes first, then a call to 911. Naloxone will not harm someone who is not overdosing on an opioid.

Fentanyl test strips are inexpensive and typically give results within 5 minutes, though they might not detect more potent fentanyl-like drugs like carfentanil. Every state and Washington, D.C., has an overdose Good Samaritan law, which can offer some legal protection to someone who calls 911 at an overdose.

Because fentanyl is an opioid, the approaches used in treatment for opioid addiction apply to fentanyl addiction as well.

Who Is at Risk of Opioid Addiction?

Opioid use disorder can develop in anyone who takes opioids, even when the medication comes from a prescription. The risk climbs when someone takes higher doses than prescribed, takes them more often than directed, mixes opioids with other substances, or uses them in a way a doctor did not intend. A personal or family history of substance misuse and some mental health conditions raise the risk further.

Several factors make opioid addiction more likely.

Taking opioids with alcohol or sedatives increases the risk of dangerous breathing suppression, and that includes mixing opioids and benzodiazepines.

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Lowering your risk if you are prescribed opioids

Frequently Asked Questions About Opioid Addiction