Before We Start
The three signs that tell you someone has overdosed on opioids
In an opioid overdose — whether from a hospital medication error, a PCA pump malfunction, or a patient who took too much at home — three things happen to the body that are instantly recognizable if you know what to look for.
These three signs are called the opioid toxidrome — a pattern of clinical findings that together point to opioid poisoning. You don't need a drug test to recognize an opioid overdose. You need your eyes, your penlight, and your watch.
💡 What is a Toxidrome?
A toxidrome is a syndrome — a group of signs and symptoms — caused by a specific class of drug. Different drug classes produce different toxidromes. The opioid toxidrome is one of the most important to recognize because it has a fast-acting antidote: naloxone (Narcan). The faster you recognize it, the faster you can reverse it.
The Opioid Triad
Three signs — all three present = opioid overdose until proven otherwise
1 — Pinpoint Pupils (Miosis)
Pupils constrict to 1–2mm — the signature opioid finding
Opioids stimulate the Edinger-Westphal nucleus in the brainstem, which drives the parasympathetic constriction of the pupil. In an overdose, the pupils become fixed and pinpoint — often 1mm or less — and may not react normally to light.
How to assess: Shine a penlight directly into each eye in a dimly lit room. Normal pupils are 3–5mm and constrict briskly to light. Opioid miosis: 1–2mm, bilateral, may be sluggish or non-reactive in severe overdose.
Critical distinction: Pinpoint pupils are the ONLY one of the triad that is specific to opioids. Other causes of CNS depression (alcohol, benzodiazepines, barbiturates) cause large, sluggish pupils — not pinpoint. If you see pinpoint pupils in an unresponsive patient, opioids are the primary suspect.
💊 Pinpoint pupils + unresponsive patient = give Narcan first, ask questions later. The risk of withholding Narcan from a true opioid overdose far outweighs the risk of giving it unnecessarily.
2 — Respiratory Depression
Breathing slows, shallows, and eventually stops
Opioids suppress the respiratory center in the medulla — the brainstem area that sends the signal to breathe. In an overdose, this suppression becomes so profound that the signal weakens or disappears.
What you observe:
• Respiratory rate below 12 → concerning
• Respiratory rate below 8 → emergency
• Respiratory rate 2–4 with long pauses → critical, death is imminent without intervention
• Breathing may be irregular — Cheyne-Stokes pattern (cycles of fast and slow breathing)
• Breathing is shallow — the chest barely moves
• SpO2 dropping — cyanosis (blue lips/fingertips) in severe cases
Why this kills: No breathing → no oxygen reaching the brain. Brain cells begin dying within 4–6 minutes of no oxygen. If the patient is found in respiratory arrest, CPR + Narcan are both required.
💊 Count the actual respiratory rate — don't estimate. Place your hand on the patient's chest or watch the rise and fall for a full 60 seconds. Counting for 15 seconds and multiplying by 4 misses irregular patterns. In suspected overdose, count the full minute.
3 — Unconsciousness (Altered LOC)
Cannot be aroused — unresponsive to voice or pain
The CNS depression of opioid overdose progresses through sedation → stupor → coma. In overdose, the patient cannot be aroused by normal stimuli — calling their name, shaking their shoulder, or a sternal rub produces little to no response.
The AVPU scale in overdose:
• A (Alert) — not in overdose
• V (responds to Voice) — possible over-sedation, check other triad signs
• P (responds to Pain only) — probable overdose, act immediately
• U (Unresponsive) — overdose/emergency, call code, give Narcan
Do not confuse with sleep: A sleeping patient rouses with a verbal stimulus. An overdose patient does not. The test is: can you wake them up with a normal stimulus? If not — this is not sleep.
💊 The sternal rub is a pain stimulus used to assess depth of unconsciousness — knuckles firmly rubbed on the sternum. If the patient does not respond to this, they are deeply unresponsive. Do not waste time with gentler stimuli — call for help and get Narcan.
The Response
What to do when you recognize the triad — in order
Step 1
Stimulate and call for help simultaneously
Call the patient's name loudly, shake their shoulder, apply a sternal rub. If there is no response, call a code (or activate rapid response). Do not leave the patient alone to get help — use the call system or have a colleague activate the response while you stay at the bedside.
Do not wait to see if they "come around." In an overdose, time matters — every minute of hypoxia damages brain cells.
Step 2
Airway — position and oxygen
Position the patient supine, tilt the head back, and lift the chin to open the airway (head-tilt chin-lift). Apply supplemental oxygen via non-rebreather mask at 10–15L/min. If the patient is not breathing, begin bag-valve-mask (BVM) ventilations.
Oxygen buys you time. The brain can tolerate short periods of hypoxia better if some oxygen is getting in.
Step 3
Administer Naloxone (Narcan)
Naloxone is a pure opioid antagonist — it competes with opioids for receptor binding and wins. Within 1–2 minutes of administration, it reverses sedation, respiratory depression, and miosis.
Routes and doses:
• IV: 0.4–2mg — fastest onset, titrate by giving small amounts and reassessing
• IM: 0.4–2mg into large muscle
• Intranasal (IN): 4mg/0.1mL — available as Narcan nasal spray, used outside hospital
• Subcutaneous: slower onset, used when no IV access
After giving Narcan: Stay at the bedside. Watch for re-narcotization (the opioid outlasting the Narcan). Be prepared to redose every 2–3 minutes if needed. Total safe dose: up to 10mg in rapid succession in true overdose.
💊 Giving Narcan reverses everything — including pain relief. The patient may wake up suddenly in severe pain and agitation. This is expected. Do not be alarmed — stay calm, reassure the patient, and call the provider for pain management alternatives.
🏥 Clinical Scenario — Finding an Overdose
You are doing rounds at 2am on a medical-surgical floor. You enter Room 14 to check on Mr. Williams, 54 years old, who had abdominal surgery yesterday and has been on IV hydromorphone (Dilaudid) for pain. You find him in bed, not moving.
See
Visual assessment: He appears deeply asleep. His lips have a slight dusky color. His chest is barely moving. You notice the hydromorphone PCA pump shows 34 patient-requested doses in the past 2 hours — significantly above normal.
Check
Stimulate: "Mr. Williams — can you hear me?" No response. You shake his shoulder. No response. Sternal rub — minimal groaning, no purposeful movement. Triad sign 3 confirmed: unresponsive.
Assess
Rapid assessment: RR 5 breaths/minute, irregular and very shallow. SpO2 82%. Penlight to pupils — bilateral pinpoint, approximately 1mm, non-reactive. All three triad signs present: pinpoint pupils + respiratory depression + unconsciousness = opioid overdose.
Act
Response: Pull call cord, activate rapid response. Apply O2 via NRB at 15L. Grab Narcan from medication cart — 0.4mg IV push given now. 90 seconds later: RR increases to 10, SpO2 climbing to 88%, patient beginning to stir. Second 0.4mg dose given. RR now 14, patient arousable. PCA pump locked out. Provider at bedside. Continue monitoring — hydromorphone has a longer duration than Narcan.
📌 NCLEX Application
The opioid triad appears on NCLEX in two forms:
Recognition questions: "Which assessment findings indicate opioid toxicity?" → Select pinpoint pupils, RR below 12, and decreased level of consciousness. Nausea and constipation are opioid side effects but not the toxidrome.
Priority action questions: "A patient is found unresponsive with pinpoint pupils and a RR of 6. What is the nurse's priority action?" → The answer choices will include "call the provider," "administer Narcan," "apply oxygen," and "document findings." The correct sequence is: stimulate → airway/oxygen → Narcan → call provider. On NCLEX, calling the provider is never the first action in an acute emergency — the nurse stabilizes first.
Important detail: Narcan is given and works. NCLEX may then ask: "What does the nurse monitor for after Narcan administration?" → Re-narcotization — the patient returning to respiratory depression when Narcan wears off before the opioid clears.
⚠️ The Trap — Assuming the Patient is "Just Sleeping"
Post-operative patients sleep. Patients in pain who finally get relief sleep. Patients who are exhausted sleep. This is normal — and it creates a trap where a nurse mistakes opioid-induced unconsciousness for normal sleep and walks away.
The test is simple: A sleeping patient rouses when you say their name or touch their shoulder. A patient in opioid-induced unconsciousness does not. If you cannot wake someone up normally, that is not sleep. That is a neurological emergency until proven otherwise.
The documentation failure: "Patient sleeping, not disturbed" is one of the most dangerous nursing notes when the patient is actually in early respiratory depression. Assessment requires stimulating the patient — not just observing that they appear asleep.
On NCLEX: Any question that says a patient on opioids is "difficult to arouse" or "unresponsive to verbal stimuli" — that patient has the triad. Treat it as an overdose, not as comfort.
✓ Quick Self-Test
Answer before checking:
1. What are the three signs of the opioid triad?
2. Which finding in the triad is most specific to opioids (not seen with alcohol or benzodiazepine overdose)?
3. A patient on opioids is found with RR 6, SpO2 85%, pinpoint pupils, and unresponsive. List your first four actions in order.
4. You give Narcan and the patient wakes up. Why must you continue monitoring?
5. What is re-narcotization?
Answers:
1. Pinpoint pupils (miosis), respiratory depression (RR below 12), and unconsciousness/altered LOC.
2. Pinpoint pupils. Alcohol and benzodiazepines cause large, sluggish pupils — not pinpoint. Pinpoint is the opioid signature.
3. (1) Stimulate and call for help. (2) Open airway and apply high-flow oxygen. (3) Administer Narcan. (4) Call provider and continue monitoring.
4. Narcan lasts 30–90 minutes. Most opioids last longer. The opioid can re-sedate the patient after Narcan wears off.
5. Re-narcotization is the return of opioid-induced sedation and respiratory depression after Narcan wears off — because the opioid is still present in the system but the antidote has been metabolized.