Opioid overdose care for paramedics in Canada: breathe for them first, then titrate naloxone

#The wrong finish line

A lot of opioid overdose calls are judged, by paramedics and bystanders alike, by one thing: did the patient wake up? It's an understandable instinct. A sitting, talking patient feels like a win.

But for paramedics, waking the patient isn't the job. Restoring breathing is. A patient pushed into abrupt withdrawal by a big naloxone dose may vomit with a compromised airway, become combative in a small room, refuse transport and leave before the naloxone wears off. The crew "won" the moment and lost the call.

Opioid overdose remains a common high-acuity call for paramedics in Canada. Public Health Agency of Canada surveillance shows that most opioid toxicity deaths in recent years have involved fentanyl or fentanyl analogues. This piece covers the clinical priorities and the realities that come with them.

#Opioid overdose for paramedics: airway and breathing before naloxone

The physiology is simple. Opioids kill by suppressing the drive to breathe. Hypoxia, not the opioid itself, causes the brain injury and the arrest. That's why the first priority is oxygenation:

• Open the airway with positioning and basic manoeuvres. Clear secretions or vomit.
• Ventilate with a bag-valve-mask and supplemental oxygen if breathing is inadequate.
• Monitor with pulse oximetry and, where available, waveform capnography, which shows whether ventilation is actually working.
• Then give naloxone, by the route and dose in your service's medical directives.

Ventilation buys time and makes naloxone safer. A well-oxygenated patient who wakes gradually is far less likely to wake confused, vomiting and fighting. If the patient is pulseless, it's a cardiac arrest: follow your resuscitation directives, where high-quality CPR and ventilation come first.

#Titrating naloxone: what the goal is

The aim of naloxone in a breathing-depressed patient is adequate spontaneous ventilation, not full alertness. Titrating means giving smaller amounts and reassessing, rather than one large dose.

Why it matters:

1. Abrupt withdrawal is unpleasant and dangerous. Vomiting, agitation and sometimes violence follow sudden reversal, and an airway at risk is worse than a sleepy patient who is breathing.
2. Naloxone can wear off before the opioid does. Long-acting or high-potency opioids may outlast it. A patient who's been heavily reversed and refuses care may become sedated again later, alone.
3. Mixed ingestions are common. Sedatives, alcohol, stimulants and adulterants can blunt the response to naloxone. If ventilation is still poor after reasonable naloxone, keep breathing for the patient and think about what else is involved.

Your medical directives set the starting dose, route, repeat interval and maximum. Know them, and know when to stop giving naloxone and simply keep ventilating.

Reassessment doesn't stop once the patient is breathing. Watch for returning sedation, falling sats or a rising end-tidal reading during the rest of the call. Explain to the patient, in plain terms, why staying under observation matters. If they decline transport, follow your service's refusal process carefully: assess capacity, explain the specific risk of re-sedation, involve online medical control where your directives call for it and document the conversation. A rushed refusal is one of the riskier moments on an overdose call, for the patient and for the crew.

#Fentanyl-era realities

The drug supply in Canada has changed what overdose calls look like:

• Rapid onset. Fentanyl acts quickly, so bystanders may find someone already apneic and cyanotic.
• Higher or repeated naloxone needs are reported in some cases, though ventilation remains the main treatment.
• Adulterants. Non-opioid sedatives found in the unregulated supply may not respond to naloxone at all. A patient who stays sedated but is breathing adequately after naloxone may be one of these cases.
• Bystander naloxone. Many patients will have received naloxone from a friend or a take-home kit before you arrive. Ask, and factor it in.

#Scene safety and exposure

Scene safety on overdose calls is about the usual hazards first: needles, aggressive or frightened bystanders, unstable structures and agitated patients after reversal. Standard precautions, gloves and care around sharps cover most of it.

Concerns about collapsing from brief skin contact with fentanyl are widespread. Health authorities generally describe that risk as low, and gloves plus normal hygiene are sensible. Follow your service's PPE guidance, but don't let fear of exposure delay airway care for a patient who isn't breathing.

#Harm reduction is patient care

People who use drugs often expect judgment from paramedics, and that expectation shapes whether they call 911 next time. Small things make a difference:

• Explain what happened when the patient wakes, calmly and without blame.
• Respect autonomy while explaining risks honestly, including the risk of re-sedation.
• Offer resources: take-home naloxone, supervised consumption sites, drug-checking or local outreach, depending on what exists in your area.
• Know the legal context. The federal Good Samaritan Drug Overdose Act provides some protection from certain charges for people who call for help at an overdose. Understanding it helps you reassure bystanders.

#For training leads

Overdose calls are frequent, which can make them feel routine. Training should push against that:

• Run scenarios where naloxone "doesn't work" so crews practise sustained ventilation and broader differentials.
• Practise BVM technique under pressure, including two-person ventilation and capnography.
• Include refusal scenarios after reversal, focusing on capacity assessment, risk explanation and documentation.
• Rehearse harm-reduction conversations, not just clinical steps.

Short decision scenarios on platforms like Imedica can help crews practise the less obvious choices, such as when to stop giving naloxone and keep ventilating.

#The takeaway

Breathe for the patient first. Titrate naloxone to breathing, not to waking. Expect fentanyl-era complications such as rapid onset, mixed sedatives and bystander naloxone. Keep the scene safe without letting fear slow airway care. And treat every overdose patient as someone who may need to call you again, so they're willing to.

Drafted for Imedica Field Notes. Physician review of this article is pending.