GPT on Question 16, Sep 13
How does naloxone reverse an opioid overdose, and when should a bystander use it?Naloxone (Narcan) is an opioid antagonist. It rapidly binds to opioid receptors—especially mu receptors—and temporarily displaces opioids such as heroin, fentanyl, oxycodone, or methadone. This can restore breathing and consciousness within a few minutes. It does not reverse overdoses caused solely by alcohol, benzodiazepines, or stimulants, but it is generally safe if opioids are not involved.
When a bystander should use it
Give naloxone immediately if opioid overdose is possible and the person:
- •Cannot be awakened or is unusually unresponsive
- •Is breathing very slowly, irregularly, or not at all
- •Has snoring, choking, or gurgling sounds
- •Has blue/gray lips or fingertips
- •Has pinpoint pupils, though this sign may be absent
When uncertain, give it rather than wait.
What to do
- 1.Call emergency services immediately.
- 2.Give naloxone according to the device instructions—commonly one nasal-spray dose.
- 3.Provide rescue breaths or CPR as advised by the dispatcher; use an AED if available.
- 4.If the person does not respond, give another dose every 2–3 minutes if available. Fentanyl overdoses may require multiple doses.
- 5.Once breathing normally, place them on their side and stay with them.
Naloxone often lasts only 30–90 minutes, shorter than many opioids, so overdose symptoms can return. Emergency evaluation is still essential even if the person wakes up. They may awaken confused or experience sudden withdrawal, including agitation, vomiting, sweating, and pain.
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