Betamethasone is a potent, long-acting synthetic glucocorticoid with high anti-inflammatory, immunosuppressive, and antipruritic activity. It is approximately 8-10 times more potent than prednisolone. In the Indian context, it is widely used in dermatology, rheumatology, ophthalmology, and for managing acute allergic and inflammatory conditions. It is available in various formulations including oral, topical, injectable, and for nasal/ophthalmic use.
Adult: Varies widely by indication and route. Oral: 0.5 mg to 9 mg daily in divided doses, often starting higher and tapering. IM (as Sodium Phosphate): 0.5 - 9 mg/day. Intra-articular/Soft Tissue: 0.25 - 2.0 mL of injectable suspension (depending on joint size). Topical: Apply a thin film to affected area 1-3 times daily.
Note: Oral: Take with food or milk to minimize GI upset. Do not stop abruptly; taper dose gradually. Injectable: For IM use, inject deep into gluteal muscle. For intra-articular, use strict aseptic technique. Topical: Apply to clean, dry skin. Do not use occlusive dressings unless directed. Do not use on face, groin, or axillae for prolonged periods.
Betamethasone binds to intracellular glucocorticoid receptors (GRs) in the cytoplasm. The receptor-ligand complex translocates to the nucleus, where it modulates gene transcription by binding to Glucocorticoid Response Elements (GREs) or inhibiting transcription factors like NF-ÎșB and AP-1. This leads to increased synthesis of anti-inflammatory proteins (e.g., lipocortin-1) and decreased synthesis of pro-inflammatory mediators (e.g., cytokines, chemokines, prostaglandins, leukotrienes).
Pregnancy: Pregnancy Category C (US FDA). May cause fetal harm. Use only if potential benefit justifies risk. Can cause fetal adrenal suppression. Antenatal use for fetal lung maturation is a recognized benefit but specific corticosteroids (e.g., dexamethasone, betamethasone) are used under protocol.
Driving: May cause dizziness, vertigo, or visual disturbances. Patients should not drive or operate machinery if they experience these effects.
| Warfarin/Anticoagulants | Betamethasone may alter response; monitor INR closely. | Major |
| NSAIDs (e.g., Ibuprofen, Diclofenac) | Increased risk of GI ulceration and bleeding. | Major |
| Diuretics (e.g., Furosemide, Hydrochlorothiazide) | Enhanced potassium loss, risk of hypokalemia. | Major |
| Antidiabetics (Insulin, Metformin) | Betamethasone causes hyperglycemia; may require dose adjustment of antidiabetics. | Major |
| Live Vaccines (e.g., MMR, Varicella) | Risk of disseminated infection; avoid vaccination. | Contraindicated |
| Enzyme Inducers (e.g., Phenytoin, Rifampicin) | Increased metabolism of betamethasone, reducing its efficacy. | Moderate |
| Enzyme Inhibitors (e.g., Ketoconazole, Itraconazole) | Decreased metabolism of betamethasone, increasing toxicity risk. | Moderate |
| Cardiac Glycosides (Digoxin) | Hypokalemia potentiates digoxin toxicity. | Major |