What Is Depo Medrol 40 Mg Injection?

What Is Depo Medrol 40 Mg Injection Used For?

Musculoskeletal & Joint Conditions (Local Effect)

• Rheumatoid arthritis and osteoarthritis — reducing synovial inflammation and joint pain
• Acute and subacute bursitis — inflammation of the fluid-filled sacs cushioning joints
• Acute gouty arthritis — providing rapid relief during painful flare-ups
• Acute non-specific tenosynovitis and epicondylitis (tennis elbow, golfer's elbow)
• Trigger finger and de Quervain's tenosynovitis — injected directly into the tendon sheath
• Ganglion cysts (cystic tumours of tendon or aponeurosis)

Dermatological Conditions (Intralesional Use)

• Keloids and hypertrophic scars
• Alopecia areata — a common cause of patchy hair loss
• Discoid lupus erythematosus and psoriatic plaques
• Lichen planus and lichen simplex chronicus (neurodermatitis)
• Granuloma annulare and necrobiosis lipoidica diabeticorum

Systemic Conditions (Intramuscular Use)

How Does Depo Medrol 40 Mg Injection Work?

• Anti-inflammatory action: Suppresses the synthesis and release of prostaglandins, leukotrienes, histamine, and cytokines — the key chemical mediators that drive pain, heat, redness, and swelling at sites of inflammation.
• Immunosuppression: Reduces lymphocyte and eosinophil activity, blocks the allergic cascade, and diminishes the proliferation of immune cells involved in autoimmune reactions.
• Vascular stabilisation: Reduces capillary permeability, preventing plasma proteins and fluid from leaking into inflamed tissues — which is what causes the visible swelling in conditions like bursitis and tenosynovitis.

Depo Medrol 40 Mg Dosage — By Route of Administration

Intra-Articular & Soft Tissue (Local)

• Large joints (knee, hip, shoulder): 20–80 mg per injection
• Medium joints (elbow, wrist): 10–40 mg per injection
• Small joints (finger, toe): 4–10 mg per injection
• Bursae: 4–30 mg per site
• Tendon sheaths: 4–30 mg per injection
• Intralesional (skin): 20–60 mg per site; may be divided across multiple sites

Intramuscular (Systemic)

• General systemic conditions: Initial dose of 4–120 mg IM, adjusted by condition severity and patient response
• As substitute for oral corticosteroid: A single daily IM dose equal to the total daily oral dose; for weekly effect, multiply the daily oral dose by 7
• Adrenogenital syndrome: 40 mg every 2 weeks IM
• Paediatric patients: 0.11 to 1.6 mg/kg/day IM, individualised to disease severity and clinical response

Side Effects of Depo Medrol 40 Mg Injection

Common Side Effects

• Pain, redness, swelling, or skin discolouration at the injection site
• Subcutaneous or dermal atrophy (thinning and depression of skin) — more common with intralesional use
• Headache, dizziness, and insomnia
• Nausea, vomiting, and heartburn
• Increased appetite and weight gain
• Fluid retention and mild blood pressure elevation
• Elevated blood glucose levels — especially important for patients with diabetes
• Mood changes: euphoria, irritability, or emotional lability

Serious Side Effects — Require Immediate Medical Attention

• Anaphylactic or severe allergic reactions — rare but reported with corticosteroid therapy
• Signs of infection: fever, chills, persistent fatigue — corticosteroids suppress immune defences
• Signs of Cushing's syndrome with prolonged use: round face, weight gain, purple stretch marks, easy bruising
• Adrenal insufficiency after abrupt discontinuation: extreme fatigue, nausea, low blood pressure, dizziness
• Avascular necrosis of the femoral or humeral head — risk increases with repeated high-dose IM injections
• Tendon rupture at injection sites — particularly with repeated intralesional administration
• Severe psychiatric effects: psychosis, hallucinations, severe depression

Who Should Not Use Depo Medrol 40 Mg Injection?

• Known hypersensitivity to Methylprednisolone Acetate, Macrogol 3350, or any other component of the formulation
• Systemic fungal infections (except intra-articular use for localised joint conditions)
• Intramuscular use in patients with idiopathic thrombocytopenic purpura
• Administration by the intrathecal, intravenous, epidural, intranasal, or ophthalmic routes
• Active or latent tuberculosis (use only under strict medical supervision if unavoidable)

Important Drug Interactions

How to Store Depo Medrol 40 Mg Injection 2 Ml

• Store at controlled room temperature: 20°C to 25°C (68°F to 77°F)
• Do not refrigerate or freeze the vial — freezing damages the suspension
• Protect from direct sunlight and fluorescent light
• Keep in original packaging until the point of use
• Single-use vial only — discard any unused portion immediately after administration
• Inspect the suspension visually before use; it should appear milky white without particles or discolouration — do not use if appearance is abnormal
• Keep out of reach of children

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