Dexamethasone vs hydrocortisone
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dexamethasone AND hydrocortisone
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dexamethasone hydrocortisone glucocorticoid potency mineralocorticoid equivalence official source
| Feature | Dexamethasone | Hydrocortisone |
|---|---|---|
| Type | Synthetic glucocorticoid | Cortisol, the natural glucocorticoid |
| Relative anti-inflammatory potency | High | Low |
| Approximate equivalent dose | 0.75 mg | 20 mg |
| Duration | Long acting: about 36-54 h | Short acting: about 8-12 h |
| Mineralocorticoid effect | Essentially none | Meaningful sodium-retaining effect |
| HPA-axis suppression | Strong and prolonged | Shorter, more physiologic |
| Best suited for | Cerebral edema, many anti-inflammatory/antiemetic regimens, COVID-19 requiring oxygen, fetal lung maturation, situations where cortisol testing is planned | Adrenal replacement and adrenal crisis, septic shock protocols, conditions needing both glucocorticoid and mineralocorticoid activity |
Practical distinction
- Hydrocortisone is preferred for adrenal insufficiency or adrenal crisis because it replaces cortisol and provides mineralocorticoid activity. In primary adrenal insufficiency, it may still be paired with fludrocortisone for adequate chronic mineralocorticoid replacement.
- Dexamethasone is preferred when a potent, long-lasting anti-inflammatory effect is desired without salt and water retention. It is also useful if an ACTH stimulation test is anticipated because it generally does not interfere with serum cortisol measurement, unlike hydrocortisone.
Do not convert mg-for-mg. A rough conversion is:
Dexamethasone 0.75 mg ≈ hydrocortisone 20 mg for glucocorticoid effect.
Dexamethasone has negligible mineralocorticoid activity, so an equivalent anti-inflammatory dose is not equivalent for adrenal replacement. Endotext’s equivalence table lists dexamethasone as long acting with no mineralocorticoid activity, versus hydrocortisone’s short action and mineralocorticoid effect.
Adverse effects for both, especially at higher doses or longer courses: hyperglycemia, infection risk, mood or sleep changes, hypertension, osteoporosis, gastrointestinal effects, and adrenal suppression. Dexamethasone tends to cause more prolonged suppression per dose; hydrocortisone is more likely to cause fluid retention and hypokalemia at high doses.
If you mean a specific situation such as adrenal crisis, COVID-19, septic shock, cerebral edema, or steroid conversion, the preferred drug and dose differ.
In respiratory medicine
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asthma dexamethasone hydrocortisone
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GINA 2025 acute asthma systemic corticosteroids dexamethasone hydrocortisone COPD exacerbation corticosteroid guidelines
In respiratory medicine, the choice depends mainly on the condition:
| Situation | Usually preferred | Why |
|---|---|---|
| Acute asthma exacerbation | Oral prednisolone/prednisone if possible. Dexamethasone is a useful alternative, especially in children. | Dexamethasone is potent and long acting, so 1-2 doses can sometimes replace a 3-5 day prednisolone course. IV hydrocortisone is an option only when oral treatment cannot be given. |
| Severe/life-threatening asthma, unable to take oral drugs | IV hydrocortisone or IV methylprednisolone | Hydrocortisone is short acting and commonly available IV. It is not intrinsically superior to an equivalent systemic steroid dose. |
| COPD exacerbation | Oral prednisolone, usually | Oral steroids are preferred when feasible. Dexamethasone and hydrocortisone are not routine first choices. |
| Severe community-acquired pneumonia | IV hydrocortisone in selected ICU patients | Hydrocortisone has evidence and guideline use in severe CAP with shock or high inflammatory burden. This is not for routine uncomplicated pneumonia. |
| COVID-19 needing supplemental oxygen or ventilation | Dexamethasone | Dexamethasone is the standard systemic corticosteroid; hydrocortisone can be used as an alternative if dexamethasone is unavailable or another indication exists. |
| Septic shock with respiratory failure | IV hydrocortisone | Used for vasopressor-dependent septic shock, not simply for hypoxemia or pneumonia alone. |
Key comparison
- Dexamethasone: very potent, long acting, negligible mineralocorticoid effect. Useful when a sustained anti-inflammatory effect is wanted.
- Hydrocortisone: less potent, short acting, has mineralocorticoid activity. Useful in shock and adrenal insufficiency, where salt-water and cortisol replacement effects matter.
- Approximate systemic anti-inflammatory equivalence: dexamethasone 0.75 mg = hydrocortisone 20 mg. Do not compare doses milligram-for-milligram. NCBI steroid-equivalence table
For acute asthma specifically
- Give repeated inhaled bronchodilator therapy and oxygen as required.
- Start systemic corticosteroid early for moderate or severe attacks.
- Oral treatment is preferred if the patient can swallow and absorb medication.
- Use IV hydrocortisone if oral therapy is not feasible.
- Dexamethasone may improve adherence because the course is shorter, particularly in pediatric practice.
GINA lists oral prednisolone as the usual adult regimen, while recognizing dexamethasone as an alternative in appropriate cases; it also emphasizes that oral corticosteroids are preferred over IV/IM treatment when possible. GINA asthma guidance
Recent pediatric evidence suggests dexamethasone is broadly comparable with prednisolone/prednisone for acute asthma, though this does not establish dexamethasone as preferable to hydrocortisone for every severe hospitalized adult presentation (systematic review, PMID: 40577515).
IMG_20260914_195940.jpg
Interpret this chest x ray
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analyse_media
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opaque hemithorax chest radiograph
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opaque hemithorax chest radiograph mediastinal shift atelectasis pleural effusion radiology
Limited interpretation: this is a photographed screen image of a single AP chest radiograph, so it cannot replace a formal radiology report.
Main finding
There is near-complete homogeneous opacification of the right hemithorax. The “L” marker is on the viewer’s right, so the white-out is on the patient’s right.
The trachea/mediastinum appear to be shifted toward the right, with signs of reduced right-sided volume. The left lung is relatively well aerated, possibly compensatorily hyperinflated.
Most likely impression
This pattern is most suspicious for complete or near-complete collapse of the right lung (right total atelectasis), likely from obstruction of the right main bronchus.
In a 58-year-old, an obstructing endobronchial lesion, including bronchogenic carcinoma, must be excluded. Other possibilities include a mucus plug, less commonly a foreign body, or prior right pneumonectomy if there is a relevant surgical history.
A massive right pleural effusion is an important alternative, but it usually pushes the mediastinum away from the opacity, whereas this image appears to show volume loss and ipsilateral shift. An opacity with ipsilateral shift generally suggests atelectasis or pneumonectomy rather than a large free effusion, as described in this review of opaque hemithorax.
Recommended next steps
- Urgent clinical assessment, especially if there is breathlessness, low oxygen saturation, fever, chest pain, or hemoptysis.
- Chest ultrasound to determine whether a large pleural effusion is present.
- Contrast-enhanced CT chest to identify right main bronchial obstruction, mass, collapse, and/or pleural fluid.
- Bronchoscopy may be required if CT suggests bronchial obstruction.
Suggested report wording:
Near-complete opacification of the right hemithorax with apparent ipsilateral mediastinal shift and volume loss, favoring near-total right lung atelectasis. Recommend urgent CT thorax and consideration of bronchoscopy to exclude central bronchial obstruction. Correlate with ultrasound for pleural effusion.
Near-complete opacification of the right hemithorax with apparent ipsilateral mediastinal shift and volume loss, favoring near-total right lung atelectasis. Recommend urgent CT thorax and consideration of bronchoscopy to exclude central bronchial obstruction. Correlate with ultrasound for pleural effusion.
It is right side pleural effusion not collapse
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pleural effusion ultrasound thoracentesis
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British Thoracic Society pleural disease guideline unilateral pleural effusion ultrasound thoracentesis 2023
You are right. This should be described as a large right-sided pleural effusion, likely occupying most of the right hemithorax, with compression of the underlying right lung.
My prior interpretation overcalled total lung collapse from a low-quality photographed image. A very large effusion can obscure the right lung and may coexist with compressive atelectasis, but the primary radiographic abnormality is the pleural effusion.
Suggested X-ray impression:
Large right pleural effusion with near-complete opacification of the right hemithorax and probable adjacent compressive atelectatic change. No conclusion about an underlying lung lesion can be made from this single photographed AP film.
For a new, unilateral effusion of this size, usual next steps are:
- Thoracic ultrasound to confirm volume, free versus loculated fluid, and choose a safe puncture site.
- Ultrasound-guided diagnostic thoracentesis, unless a clear cause such as decompensated heart failure is already established.
- Pleural fluid: protein, LDH with paired serum values, cell count/differential, glucose, pH if infection is possible, Gram stain/culture, and cytology. Consider ADA and mycobacterial testing where tuberculosis is clinically plausible.
- Contrast CT chest, commonly after partial drainage if needed, to evaluate lung, pleura, and mediastinum for malignancy, pneumonia, tuberculosis, or other causes.
Textbook guidance supports diagnostic thoracentesis for most new effusions unless the cause is clear, and ultrasound both confirms the effusion and improves procedure safety. The BTS pleural disease guideline covers the investigation pathway for an undiagnosed unilateral pleural effusion.
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