Dexamethasone & Field Steroids
Objective: Name the problem before you open a steroid: croup, bronchospasm, adrenal crisis, or an anaphylaxis add-on. Dexamethasone and methylprednisolone are not a rescue by themselves. Do not delay the fast-acting drugs. Your protocol card sets the amount.
Why this matters
Name the problem before you open a steroid: croup, bronchospasm, adrenal crisis, or an anaphylaxis add-on. Epinephrine and bronchodilators work in minutes. Corticosteroids work over hours. They are not a rescue by themselves.
Adrenal crisis is the exception. The steroid replaces a missing hormone. You still treat the shock. Your protocol card sets the amount. This site does not list milligrams.
- Know which steroid you carry, and which indications your protocol lists. Examples are dexamethasone by mouth, intramuscular, or intravenous; methylprednisolone intravenous; or prednisone by mouth.
- Croup: one dose of dexamethasone is common EMS teaching. Do not start an IV only to give it.
- Anaphylaxis: epinephrine first. A steroid does not open the airway in the next minute.
Clinical sequence
- Name the problem. Croup, asthma or COPD, adrenal insufficiency, or an anaphylaxis add-on.
- Give the fast treatments first. Epinephrine, a nebulizer, oxygen, the airway, and fluids as indicated. A steroid does not rescue the next minute. Do not delay those drugs for dexamethasone or methylprednisolone.
- Then give the steroid per protocol. Dexamethasone by mouth is fine if the patient can swallow and the protocol allows it. Do not fight a toddler with stridor for an IV when an oral or intramuscular dose is authorized.
- Adrenal crisis looks like a steroid-dependent patient who is vomiting and in shock. Give the steroid, give fluids, and check glucose. This is not a simple stomach illness.
Teaching points
- Onset: the clinical effect is delayed. Steroids reduce later swelling and relapse over hours. They are not a rescue blood-pressure drug.
- Croup: dexamethasone is first-line in many pediatric pathways. Keep the child calm. Racemic epinephrine is for severe stridor if you are authorized.
- Asthma and COPD: give the steroid once the nebulizer, epinephrine, and CPAP or noninvasive-ventilation plan is moving. Do not skip it because the hospital will give it.
- Anaphylaxis: the steroid is an add-on only. Refractory anaphylaxis needs more epinephrine and an airway plan, not more steroid.
- Fast-acting drug first. Then the steroid.
- The indication is this problem, named out loud.
- Croup: dexamethasone, and keep the child calm.
- Adrenal shock: steroid plus fluids, not only an antiemetic.
Common errors
- Giving dexamethasone instead of intramuscular epinephrine for anaphylaxis.
- Fighting a toddler with stridor for an IV when oral or intramuscular dexamethasone is authorized.
- Forgetting the steroid in a known adrenal-insufficient patient with vomiting and low blood pressure.
Practice
One-minute check
Three patients, three jobs. Say the order of drugs: (1) a barking 2-year-old with stridor at rest; (2) an adult with anaphylaxis who is still wheezing after the first epinephrine; (3) a steroid-dependent adult who is vomiting, with a blood pressure of 78.
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, and allergic reaction. Steroids are listed add-ons.
- AHA 2025 Part 10: Special Circumstances — In anaphylaxis, epinephrine is first. Steroids are not the immediate rescue.
- GINA 2026 Strategy Report — Systemic corticosteroids for acute asthma. They do not replace bronchodilators.
Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.
Check Your Understanding
Questions drawn only from this lesson. After you check, the key is highlighted. Education practice — not a certification exam.