Benzodiazepines in the Field
Objective: Benzos stop seizures and can calm severe agitation — and they take the drive to breathe with them. Airway first, protocol indication only, no stacking with opioids without a plan.
Why This Matters
Midazolam, diazepam, and lorazepam show up in seizure, pacing sedation, and behavioral protocols. They are GABA agonists: they sedate and they depress ventilation. Combined with alcohol, opioids, or head injury they are unforgiving. This lesson is framing — not a formulary.
Common EMS Contexts
- Seizure / status: first-line class in most protocols when the seizure is not stopping (see seizure lesson). IM midazolam is an evidence-based route when no IV is available (RAMPART) — protocol owns the drug, route, and dose.
- Severe agitation that is a safety/medical threat, when authorized — not for mild anxiety or a loud argument.
- Conscious pacing or cardioversion sedation in some systems.
Safety Habits
- BVM, suction, SpO₂, and EtCO₂ when available before the IM/IN/IV goes in for sedation-level uses.
- Weight-based math and a second check. IN vs IM vs IV onset times differ — do not redose instantly because they are “not asleep yet” unless protocol says so.
- Do not stack with opioids or alcohol without extra airway vigilance and a documented indication.
- This site does not publish doses, routes, or maxes.
- Indication: status seizure vs severe agitation vs procedural sedation
- Airway staged: BVM, suction, SpO₂ (EtCO₂ when available)
- kg and route (IN vs IM vs IV) — onset differs
- Stacking risk named if opioids/alcohol are in play
Field Pitfalls
- Using a benzo for pain because fentanyl is “scary.”
- Repeat IN sprays every 30 seconds in a closed ambulance with no BVM out.
- Calling the job done after IM agitation meds and not watching ventilation.
- Treating flumazenil as “naloxone for benzos.” It is not a routine field reversal — seizure risk is real, especially in mixed or chronic-use overdoses. Follow protocol only.
Practice
60-second drill
Open your benzo protocol. For each line say indication → route preference → monitoring required after the dose: (1) ongoing seizure without IV; (2) severe agitation that is a safety threat; (3) conscious pacing sedation if your system includes it. Related: Seizure, Ketamine.
Sources & Further Study
Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.
- RAMPART (NEJM 2012) — IM midazolam vs IV lorazepam for prehospital status
- ILAE 2015 status epilepticus definition
- NASEMSO National Model EMS Clinical Guidelines (2022)
- Benzodiazepines for protocol indications (status seizure, selected sedation). Monitor ventilation. Not a pain medicine. Protocol owns the dose.
Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.
Check Your Understanding
Street decisions from this lesson only. After you check, the key is highlighted. Education practice — not a certification exam.