💊 Opioid Overdose Reversal (Naloxone)
This tool gives the naloxone dosing strategy for opioid overdose by setting and dependence, emphasizing ventilatory support and observation for recurrence.
The goal of naloxone is adequate ventilation and airway protection, not full arousal, since over-reversal precipitates withdrawal and pulmonary edema. (original synthesis · not guideline verbatim)
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When to use
Use to start airway/ventilation first, then dose naloxone appropriately, titrating low in dependent patients and observing for re-narcotization.
How it works
Airway/ventilation first. Out-of-hospital 0.4 mg IM or 4 mg intranasal. In-hospital non-dependent 0.4 mg IV titrated; dependent 0.04–0.1 mg IV to avoid withdrawal; up to 10 mg. Observe ≥ 2–4 h; infusion for long-acting/large overdoses.
Key points
- The goal of naloxone is adequate ventilation and airway protection, not full arousal, since over-reversal precipitates withdrawal and pulmonary edema. (original synthesis · not guideline verbatim)
- Naloxone is shorter-acting than most opioids, so respiratory depression can recur and observation is required.
- No response after a cumulative 10 mg prompts reassessment for a non-opioid cause.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Setting | Out-of-hospital / prehospital |
|---|---|
| Opioid dependence/chronic use | No or unknown |
→DispositionNaloxone + ventilatory support
- Airway/ventilation (priority)：Open the airway, bag-mask assisted ventilation, oxygen; ABC first, correcting hypoxia matters more than full arousal
- Naloxone：Out-of-hospital/prehospital: naloxone 0.4 mg IM or 4 mg intranasal, repeat every 2–3 min; call emergency services and assist ventilation simultaneously; the goal is to restore adequate spontaneous ventilation and airway protection, not full arousal (over-reversal can cause acute withdrawal, agitation, pulmonary edema)
- No response：If cumulative ~10 mg still gives no response, reassess for a non-opioid cause (hypoxic encephalopathy, mixed poisoning, other causes)
Frequently asked questions
- What is Opioid Overdose Reversal (Naloxone)?
- This tool gives the naloxone dosing strategy for opioid overdose by setting and dependence, emphasizing ventilatory support and observation for recurrence.
- How is Opioid Overdose Reversal (Naloxone) calculated? What is the core formula?
- Airway/ventilation first. Out-of-hospital 0.4 mg IM or 4 mg intranasal. In-hospital non-dependent 0.4 mg IV titrated; dependent 0.04–0.1 mg IV to avoid withdrawal; up to 10 mg. Observe ≥ 2–4 h; infusion for long-acting/large overdoses.
- When is Opioid Overdose Reversal (Naloxone) used?
- Use to start airway/ventilation first, then dose naloxone appropriately, titrating low in dependent patients and observing for re-narcotization.
- What are the key clinical points for Opioid Overdose Reversal (Naloxone)?
- The goal of naloxone is adequate ventilation and airway protection, not full arousal, since over-reversal precipitates withdrawal and pulmonary edema. (original synthesis · not guideline verbatim) Naloxone is shorter-acting than most opioids, so respiratory depression can recur and observation is required. No response after a cumulative 10 mg prompts reassessment for a non-opioid cause.
- What are the limits and cautions when using Opioid Overdose Reversal (Naloxone)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Opioid Overdose Reversal (Naloxone) calculated in practice? Can you show a worked example?
- Inputs: Setting Out-of-hospital / prehospital, Opioid dependence/chronic use No or unknown → Result: Disposition Naloxone + ventilatory support（Airway/ventilation (priority): Open the airway, bag-mask assisted ventilation, oxygen; ABC first, correcting hypoxia matters more than full arousal, Naloxone: Out-of-hospital/prehospital: naloxone 0.4 mg IM or 4 mg intranasal, repeat every 2–3 min; call emergency services and assist ventilation simultaneously; the goal is to restore adequate spontaneous ventilation and airway protection, not full arousal (over-reversal can cause acute withdrawal, agitation, pulmonary edema), No response: If cumulative ~10 mg still gives no response, reassess for a non-opioid cause (hypoxic encephalopathy, mixed poisoning, other causes)）