Opioid Use Disorder (OUD) is diagnosed when 2 or more of 11 DSM-5 criteria are present within 12 months: using more than intended, failed attempts to cut back, significant time spent obtaining or using, cravings, neglecting responsibilities, continued use despite social problems, abandoning activities, hazardous use, continued use despite health harm, tolerance, and withdrawal. Physical signs include pinpoint pupils, nodding off, slowed breathing, and constipation. Behavioral signs include doctor shopping, running out early, and hiding use. Approximately 2.7 million Americans have OUD — and most don't recognize it as a clinical condition that responds to treatment.
The DSM-5 replaced older "abuse" and "dependence" categories with a single spectrum diagnosis: Opioid Use Disorder. Two or more of the following 11 criteria within 12 months = diagnosis. Note: tolerance and withdrawal do not count toward the diagnosis for patients taking opioids strictly as prescribed under medical supervision.
Taking opioids in larger amounts or over a longer period than originally planned. "I was only going to take half" or "one pill became three" are common patterns.
Wanting to stop or reduce opioid use but being unable to do so despite genuine attempts. Repeated failed quit attempts are a key diagnostic signal.
Large amounts of time spent obtaining opioids (driving to multiple pharmacies, contacting multiple sources), using them, or recovering from their effects.
A strong urge or compulsion to use opioids. Preoccupation with the next dose, difficulty focusing on other things, or intense anxiety when access is uncertain.
Neglecting work, school, or family duties due to opioid use. Showing up late, missing deadlines, or being impaired during responsibilities are common examples.
Continuing opioid use despite it causing or worsening relationship conflicts, family breakdowns, or social isolation. Choosing opioids over relationships.
Withdrawing from hobbies, sports, friendships, or other activities that previously mattered — replaced by opioid use and the time required to maintain it.
Using opioids in situations where it is physically dangerous — driving, operating machinery, caring for children, or using while mixing with alcohol or benzodiazepines.
Continuing to use despite awareness of a physical or mental health problem caused or worsened by opioids — infections, liver damage, severe constipation, depression, or memory problems.
Needing markedly more opioids to achieve the same effect, or noticing diminished effect from the same dose. Tolerance develops rapidly — within days to weeks of regular use. (Does not count for patients on prescribed opioid therapy.)
Experiencing opioid withdrawal symptoms when stopping or reducing use, or taking opioids specifically to avoid withdrawal. Symptoms include anxiety, muscle aches, sweating, nausea, and severe insomnia. (Does not count for patients on prescribed opioid therapy.)
These physical signs may appear during intoxication or with regular opioid use:
Constricted pupils that don't react normally to light changes. A hallmark sign of opioid intoxication even in dark environments.
Falling in and out of consciousness ("the nod") mid-conversation or mid-activity — characteristic of opioid sedation.
Opioids suppress the brain's drive to breathe. Slower, shallower breathing at rest. In overdose, breathing stops — the primary cause of death.
Opioid-induced constipation is nearly universal in regular users. Opioid receptors in the gut slow GI motility — constipation persists even when tolerance to pain relief develops.
Opioid intoxication causes slurred, slow speech. Combined with drowsiness and small pupils, this triad often indicates active opioid use.
Opioids trigger histamine release, causing flushing, warmth, and itching — particularly common on the face, neck, and chest after doses.
Opioids suppress appetite and GI function. Combined with the lifestyle disruption of active addiction, significant weight loss is common.
Sweating, goosebumps, restlessness, and flu-like symptoms when opioids wear off — using to "feel normal" rather than to get high signals physical dependence.
If you checked 3 or more: consider speaking with a doctor or addiction specialist. Treatment for Opioid Use Disorder is highly effective and can prevent overdose.
Physical dependence means the body has adapted to opioids and will experience withdrawal if stopped abruptly. This is an expected physiological response that occurs with regular opioid use — including legitimate prescribed use. A patient who has been on opioids for chronic pain for 6 months is almost certainly physically dependent but may not have Opioid Use Disorder.
Opioid Use Disorder involves compulsive use, loss of control, and continued use despite serious harm. The DSM-5 explicitly excludes tolerance and withdrawal from the OUD diagnostic criteria when opioids are taken strictly as medically prescribed — because those criteria would otherwise pathologize appropriate pain management.
The key diagnostic question is not "does this person need opioids to function?" but "has the person lost control over their use?" If someone is taking more than prescribed, using to get high or manage emotions, or experiencing major life consequences — those are OUD signals that warrant clinical assessment regardless of whether they have a legitimate prescription.
An estimated 8–12% of people prescribed opioids for chronic pain develop Opioid Use Disorder. Several factors explain why:
Opioids activate mu-opioid receptors in the brain's reward and pain circuits, triggering a large release of dopamine. With repeated use, receptors downregulate — meaning more opioid is needed to produce the same effect (tolerance). The brain also becomes sensitized to pain in the absence of opioids, a phenomenon called opioid-induced hyperalgesia (OIH), where long-term use paradoxically increases pain sensitivity.
This creates a cycle: increasing tolerance requires increasing doses, which accelerates physical dependence and withdrawal discomfort — making it feel physically impossible to stop. The brain encodes opioid use as a survival priority, explaining the intense cravings and compulsive use even in the face of serious consequences.
Risk is significantly higher with longer duration of use (risk jumps sharply after 5+ days of consecutive use), higher daily doses, use that began in adolescence, and prior history of any substance use disorder or trauma.
⚠️ Overdose Risk After Stopping: If you or someone you know stops opioid use — including after release from jail, after hospitalization, or after a detox attempt — tolerance drops within days. Using a previously normal dose during this window carries extreme overdose risk. Naloxone (Narcan) is available without a prescription at most pharmacies and can reverse opioid overdose. Have it available.
The 11 DSM-5 OUD criteria include: using more than intended, failed attempts to cut back, significant time spent, cravings, neglecting obligations, continuing despite social problems, giving up activities, hazardous use, continuing despite health harm, tolerance, and withdrawal. Physical signs: pinpoint pupils, nodding off, slowed breathing, constipation. Behavioral signs: doctor shopping, running out early, hiding use, unexplained financial problems.
The DSM-5 clinical diagnosis for opioid addiction — 2+ of 11 criteria in 12 months. Mild: 2–3 criteria. Moderate: 4–5. Severe: 6+. Approximately 2.7 million Americans are affected. Highly treatable with medication-assisted treatment (buprenorphine, methadone, naltrexone).
Physical dependence is the body adapting to opioids and experiencing withdrawal without them — this is expected with regular medical use. Addiction (OUD) involves compulsive use, loss of control, and harm despite serious consequences. The DSM-5 excludes tolerance and withdrawal from OUD criteria for patients on properly prescribed opioid therapy.
Constricted pupils that don't react to light are a hallmark of opioid intoxication. They occur because opioids activate receptors controlling the pupillary sphincter muscle. Pinpoint pupils + slowed breathing + altered consciousness = the overdose triad requiring immediate naloxone and emergency services.
Yes — an estimated 8–12% of patients prescribed opioids for chronic pain develop Opioid Use Disorder. Risk increases with longer duration, higher doses, prior substance use history, mental health conditions, and younger age at first exposure. Early recognition of escalating use is critical.
Free, confidential, 24/7 treatment referral service. Can locate local MAT providers and treatment programs.
SAMHSA's facility locator — find local buprenorphine and methadone providers by zip code.
Peer support community with meetings worldwide. Find local meetings at na.org.
Naloxone (Narcan) is also available without a prescription at most pharmacies. Having it nearby saves lives.
Forge tracks your streak and progress in recovery — whether you're counting days, logging cravings, or just trying to stay accountable.
Download Forge Free →