Depo-Medrol Injection
✅ Rapid anti-inflammatory action
✅ Long-lasting relief
✅ Convenient injectable form
✅ Improved comfort
Contains Methylprednisolone Acetate
✓ Medically reviewed by Morgan Ellis — Pharmacy Researcher · 8 years experience · Last reviewed: May 2026
⚡ Quick Answer — What is Depo-Medrol Injection?
Depo-Medrol Injection contains methylprednisolone acetate, a long-acting depot corticosteroid administered as an intramuscular (IM) or intra-articular (joint) injection. The depot formulation provides sustained anti-inflammatory effect over 1–3 weeks from a single dose. Used for severe asthma exacerbations, severe allergic reactions, autoimmune flares, and inflammatory joint disease. Important: Depo-Medrol is a systemic corticosteroid with significant side effects — short courses are preferred over long-term repeated dosing. Manufactured by Pfizer India.
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What Is Depo-Medrol Injection?
Depo-Medrol contains methylprednisolone acetate — an ester formulation that releases active methylprednisolone slowly from the injection site over days to weeks. Used in respiratory medicine for severe asthma exacerbations, severe allergic reactions, and autoimmune respiratory disease. Same drug oral formulation: Medrol tablets.
How Does Methylprednisolone Work?
Methylprednisolone is a synthetic glucocorticoid with high anti-inflammatory potency and minimal mineralocorticoid activity. It binds intracellular glucocorticoid receptors, modulating transcription of hundreds of genes:
- Reduces eosinophil, lymphocyte, and neutrophil recruitment
- Suppresses pro-inflammatory cytokines (TNF-α, IL-1, IL-6, leukotrienes, prostaglandins)
- Stabilises mast-cell and lysosomal membranes
- Reduces vascular permeability and oedema
- Suppresses immune response (T-cell proliferation, antibody production at high doses)
Uses and Indications
- Severe asthma exacerbations — depot dose for sustained release
- Severe allergic reactions — anaphylaxis adjunct, severe allergic rhinitis with depot effect
- Autoimmune respiratory disease — sarcoidosis, eosinophilic pneumonia
- Inflammatory joint disease — rheumatoid arthritis, ankylosing spondylitis (intra-articular)
- Post-extubation laryngeal oedema prophylaxis
- Acute hypersensitivity reactions requiring sustained corticosteroid effect
Depo-Medrol Dosage
| Indication | Dose | Route |
|---|---|---|
| Severe asthma exacerbation (adult) | 40–120 mg | IM, single dose |
| Allergic reactions (adult) | 40–120 mg | IM |
| Joint inflammation (large joint) | 20–80 mg | Intra-articular |
| Joint inflammation (small joint) | 4–20 mg | Intra-articular |
| Children — case by case | Specialist supervision | IM |
Administration Notes
- Always administered by a healthcare professional.
- IM site: deltoid (small dose) or upper outer quadrant of buttock (gluteus maximus).
- Shake the vial before drawing up — methylprednisolone acetate is a suspension.
- Do not give intravenously — this is a depot suspension, not for IV use.
- Rotate injection sites if multiple doses required.
Side Effects
Common (with repeated or high doses):
- Mood elevation, insomnia, irritability — typically the first 1–2 weeks
- Increased appetite, weight gain
- Mild fluid retention, ankle swelling
- Mild blood glucose elevation
- Acneiform rash
- Easy bruising at higher cumulative doses
Less common but important:
- Adrenal suppression (with repeated depot doses or doses lasting >3 weeks)
- Osteoporosis with repeated use
- Cataracts and glaucoma with repeated use
- Avascular necrosis of femoral or humeral head
- Increased infection risk (latent TB reactivation, fungal infections)
- Peptic ulcer (less than older steroids; still possible)
Serious:
- Severe allergic reaction
- Acute psychosis (rare; reversible)
- Cushingoid syndrome with chronic exposure
- Adrenal crisis on abrupt withdrawal after repeated use
Warnings and Precautions
- Single short courses are preferred over repeated long-term depot dosing — cumulative side effects build with chronic exposure.
- Active infection: screen for and treat any active infection before steroid; latent TB is a particular concern.
- Diabetes: blood glucose monitoring during and after dosing.
- Hypertension and cardiovascular disease: monitor BP; sodium retention risk.
- Peptic ulcer history: consider concurrent PPI cover.
- Live vaccines: contraindicated within 4 weeks of high-dose steroid.
- Pregnancy and breastfeeding: use only when benefits clearly outweigh risks.
- Children: growth monitoring with repeated use.
Contraindications
- Hypersensitivity to methylprednisolone
- Systemic fungal infection (untreated)
- IV administration (suspension is for IM/intra-articular only)
- Live vaccine within 4 weeks
- Untreated active TB
Drug Interactions
| Interacting drug | Effect | What to do |
|---|---|---|
| Strong CYP3A4 inhibitors (ritonavir, ketoconazole, clarithromycin) | Increased methylprednisolone exposure → Cushingoid risk | Avoid prolonged use; monitor |
| CYP3A4 inducers (rifampicin, phenytoin, carbamazepine) | Reduced methylprednisolone effect | May need higher dose |
| Live vaccines | Reduced response; risk of disseminated infection | Contraindicated within 4 weeks |
| NSAIDs | Increased GI bleed risk | Use PPI cover; minimise NSAID |
| Diuretics, β-agonists | Additive hypokalaemia | Monitor potassium |
| Warfarin | Variable INR effect | Monitor INR more frequently |
Storage
- Store at 2–25 °C; do not freeze.
- Shake well before use to resuspend the depot suspension.
- Discard after use; do not save partially-used vials for later.
Related Alternatives on MedsBase
- Asthalin Inhaler — salbutamol reliever
- Budecort Inhaler — budesonide ICS preventer
- Foracort Inhaler — budesonide + formoterol ICS-LABA
- Montair — montelukast LTRA tablet
- Tiova Inhaler — tiotropium LAMA for COPD
Frequently Asked Questions
Why depot rather than oral?
Depot formulations provide sustained anti-inflammatory effect over 1–3 weeks from a single injection — useful when oral compliance is unreliable, when sustained sustained effect is needed (severe allergy, autoimmune flare), or for intra-articular use.
How fast does Depo-Medrol work?
Onset is gradual — 1–2 days for noticeable effect; peak within 1–2 weeks. For acute severe asthma, IV hydrocortisone or oral prednisolone is usually used initially, with depot reserved for sustained cover.
Will Depo-Medrol cure my asthma?
No — it controls acute inflammation but does not address the underlying disease. Long-term asthma management is built on inhaled corticosteroids (Budecort, Beclate, Foracort) plus reliever therapy.
Are repeated doses safe?
Repeated depot doses cumulate — the side-effect profile (osteoporosis, cataract, adrenal suppression, infection risk) becomes significant. Short courses are preferred; long-term inflammation should be controlled with steroid-sparing agents.
How long does one dose last?
1–3 weeks of meaningful anti-inflammatory effect from a depot dose, depending on the dose given.
Is Depo-Medrol safe in pregnancy?
Use only when benefits clearly outweigh risks; the safest steroid in pregnancy is generally hydrocortisone or prednisolone, not depot methylprednisolone.
Why must the vial be shaken?
Methylprednisolone acetate is a suspension — the active drug is in particulate form. Shaking ensures even distribution before drawing up the dose.
Can I give myself Depo-Medrol at home?
No — IM injection requires healthcare professional administration. The sustained effect and side-effect profile make supervised dosing essential.
Is there a non-depot alternative?
Oral prednisolone (5–60 mg daily for 5–14 days) is the standard non-depot systemic steroid course for severe asthma exacerbations. IV hydrocortisone is used in hospital for life-threatening attacks.
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| Strength | 40mg/1ml, 40mg/1ml * 2ml |
|---|---|
| Quantity | 1 Injection/s, 3 Injection/s, 6 Injection/s |
| Pharma Form | Injection/s |
| Manufacturer | Pfizer India Ltd |
| Treatment | Severe allergic reactions, Allergy symptoms, Asthma |
| Generic Brand | Methylprednisolone |
Depo-Medrol Injection
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