1. Clinical Overview
Prednisolone is a synthetic glucocorticoid, a potent anti-inflammatory and immunosuppressant agent. It is the active metabolite of prednisone, converted in the liver. The 1gm formulation is a high-dose preparation used for specific, severe conditions, often in hospital settings for pulse therapy or in specialized treatment protocols. It exerts its effects by modulating gene expression, leading to profound suppression of inflammation and immune responses.
| Onset | Duration | Bioavailability |
|---|---|---|
| Rapid, with pharmacodynamic effects beginning within 1-2 hours of oral administration. | Intermediate-acting glucocorticoid; biological half-life is 18-36 hours, allowing for once-daily dosing in most regimens. | High, approximately 80-90% following oral administration. |
2. Mechanism of Action
Prednisolone is a glucocorticoid receptor (GR) agonist. It diffuses passively across cell membranes and binds with high affinity to cytosolic GRs. The activated receptor-ligand complex translocates to the nucleus, where it binds as a dimer to Glucocorticoid Response Elements (GREs) on DNA. This modulates the transcription of specific target genes, leading to increased synthesis of anti-inflammatory proteins (like lipocortin-1) and decreased synthesis of pro-inflammatory mediators (like cytokines, chemokines, adhesion molecules, and enzymes such as COX-2). It also induces apoptosis of lymphocytes.
3. Indications & Uses
- High-dose pulse therapy for severe, life-threatening autoimmune diseases (e.g., Systemic Lupus Erythematosus with nephritis or cerebritis)
- Acute graft rejection in organ transplantation (renal, liver, heart)
- Severe, refractory rheumatoid arthritis (as part of a pulse regimen)
- Induction therapy for certain severe vasculitides (e.g., Granulomatosis with polyangiitis)
4. Dosage & Administration
Adult Dosage: 1gm dose is NOT a standard daily dose. It is used in specific PULSE THERAPY protocols: e.g., 1gm intravenous infusion over 1-4 hours, repeated daily for 3-5 days. For some oral pulse regimens, 1gm may be given as a single morning dose for 1-3 days. MUST be prescribed by a specialist. Always follow institutional or published protocol guidelines.
Administration: For IV pulse: Reconstitute/dilute as per manufacturer instructions. Administer as a slow IV infusion over 1-4 hours (commonly 2-3 hours) to minimize cardiovascular effects. Monitor ECG and BP continuously during infusion. For oral pulse: Administer as a single dose in the morning with food or milk to minimize GI upset. Do not crush or chew delayed-release tablets if using that formulation.
5. Side Effects
Common side effects may include:
- Fluid and electrolyte disturbance: Sodium/fluid retention, hypokalemia, hypocalcemia
- Musculoskeletal: Muscle weakness, steroid myopathy, osteoporosis
- GI: Peptic ulcer, pancreatitis, abdominal distention
- Dermatological: Impaired wound healing, thin fragile skin, petechiae, ecchymoses
- Neurological: Insomnia, mood swings, euphoria, headache
- Metabolic: Hyperglycemia, increased appetite, weight gain, fat redistribution (moon face, buffalo hump)
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Warfarin/Acenoocoumarol | Prednisolone may alter anticoagulant response (increase or decrease INR). | Major |
| Phenytoin, Phenobarbital, Rifampicin | Induce CYP3A4, increasing prednisolone metabolism, reducing its efficacy. | Major |
| Ketoconazole, Itraconazole, Clarithromycin | Inhibit CYP3A4, decreasing prednisolone metabolism, increasing toxicity risk. | Major |
| NSAIDs (e.g., Ibuprofen, Diclofenac) | Increased risk of GI ulceration and bleeding. | Major |
| Diuretics (e.g., Furosemide, Hydrochlorothiazide) | Enhanced potassium loss, severe hypokalemia. | Major |
| Antidiabetics (Insulin, Metformin) | Prednisolone causes hyperglycemia, antagonizing effect. Requires dose adjustment. | Major |
| Vaccines (Live-attenuated: MMR, Varicella, OPV) | Reduced immune response, risk of disseminated vaccine infection. | Contraindicated |
| Digoxin | Hypokalemia increases risk of digoxin toxicity. | Moderate |
7. Patient Counselling
- DO take exactly as prescribed. DO NOT stop abruptly if on therapy for more than 2 weeks.
- DO take oral dose with food or milk.
- DO carry a steroid alert card/bracelet stating you are on high-dose steroids.
- DO inform all treating doctors (including dentists) about this medication.
- DO NOT receive live vaccines without consulting your doctor.
- DO NOT take over-the-counter NSAIDs (like ibuprofen) without asking your doctor.
8. Toxicology & Storage
Overdose: Acute overdose can manifest as exaggeration of known side effects: severe hypertension, acute psychosis, profound hyperglycemia (possibly leading to hyperosmolar state), fluid overload leading to pulmonary edema, severe hypokalemia with cardiac arrhythmias, and acute adrenal insufficiency upon sudden withdrawal after chronic use.
Storage: Store below 25°C (77°F), in a dry place, protected from light. Keep in the original container, tightly closed. Keep out of reach and sight of children. Do not use after the expiry date. For reconstituted IV solutions: Use immediately or as per manufacturer's stability data (usually within 24 hours if refrigerated).