Dexamethasone & Field Steroids
Objective: Name the job (croup, bronchospasm, adrenal, anaphylaxis adjunct) before you open dexamethasone or methylprednisolone, and do not delay the fast drugs for a steroid.
Why This Is Hard
Crews either forget steroids entirely or give them first while the kid is still stridulous and the adult is still silent-chested. GINA/NASEMSO-style asthma care and AHA special-circumstances anaphylaxis: epinephrine and bronchodilators are the minutes; corticosteroids are the hours. Adrenal crisis is the exception where steroid is the missing hormone — still support shock.
- Know which steroid you carry (dexamethasone IM/IV/PO vs methylprednisolone IV vs prednisone PO) and which indications your protocol lists.
- Croup: a single dexamethasone dose is common EMS teaching. Do not instrument the airway to “give it IV.”
- Anaphylaxis: epi first. Steroid does not reverse airway obstruction in the next 60 seconds.
Street Sequence
- Name the disease: croup, asthma/COPD, adrenal insufficiency, or anaphylaxis adjunct.
- Give the fast treatments first (epi, neb, oxygen, airway, fluids as indicated).
- Then the steroid per protocol. PO dexamethasone is fine if they can swallow and the protocol allows it.
- Adrenal/Addisonian picture (steroid-dependent, vomiting, shock): steroid plus fluids plus glucose check — this is not “just a GI bug.”
Field Rules (Education)
- Onset: clinical steroid effect is delayed. They reduce relapse and swelling over hours. They are not a rescue pressor.
- Croup: dexamethasone is first-line in many EMS/pediatric pathways. Keep the child calm; racemic epi if authorized for severe stridor.
- Asthma/COPD: give the steroid once the neb/epi/NIV plan is moving. Do not skip it because “the hospital will.”
- Anaphylaxis: adjunct only. Refractory anaphylaxis is more epi and an airway plan, not more steroid.
- Fast drug first — then the steroid
- Indication is __
- Croup: dex, keep them calm
- Adrenal shock: steroid + fluids, not just ondansetron
Field Pitfalls
- Giving dexamethasone instead of IM epinephrine for anaphylaxis.
- Fighting a stridulous toddler for an IV when PO/IM dex is authorized.
- Forgetting steroids in a known Addison’s patient with vomiting and hypotension.
Practice
60-second drill
Three vials, three jobs: (1) barking 2-year-old, stridor at rest; (2) adult anaphylaxis, still wheezing after first epi; (3) steroid-dependent adult, vomiting, BP 78. Order of drugs for each.
Related: Stridor: Croup vs Epiglottitis, Asthma & COPD Crisis Ventilation.
Sources & Further Study
Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.
- NASEMSO National Model EMS Clinical Guidelines (2022) — croup, asthma, allergic reaction — steroids as listed adjuncts
- AHA 2025 Part 10: Special Circumstances — anaphylaxis — epinephrine first; steroids are not the immediate rescue
- GINA asthma strategy — systemic corticosteroids for acute asthma — not a substitute for bronchodilators
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.