Common Long-Term Risks
Prednisone, a corticosteroid, suppresses inflammation but carries significant risks with prolonged use (typically over months or years). These stem from its interference with the body's natural hormone production, immune function, and metabolism. Key risks include:
- Osteoporosis and fractures: It reduces bone density by inhibiting calcium absorption and bone formation, raising fracture risk by up to 50% after one year of moderate doses.[1][2]
- Weight gain and metabolic changes: Causes fat redistribution (Cushingoid features like moon face and buffalo hump), insulin resistance, and type 2 diabetes risk increases 2-5 fold.[1][3]
- High blood pressure and cardiovascular issues: Elevates blood pressure via sodium retention and can accelerate atherosclerosis, doubling heart disease risk in long-term users.[2][4]
Effects on Eyes and Muscles
- Cataracts and glaucoma: Posterior subcapsular cataracts develop in 10-30% of patients after years of use; glaucoma risk rises due to increased intraocular pressure.[1][5]
- Muscle weakness (myopathy): Proximal muscle wasting occurs, impairing mobility, especially at doses over 10 mg/day.[2]
Immune and Infection Risks
Long-term prednisone weakens immunity, increasing susceptibility to infections:
- Bacterial, viral (e.g., shingles), fungal, and opportunistic infections like Pneumocystis pneumonia.
- Slower healing and reactivation of latent tuberculosis.[1][3]
Skin, Mood, and Gastrointestinal Issues
- Skin thinning and bruising: Fragile skin, easy bruising, poor wound healing, and striae from collagen breakdown.[2]
- Mood and psychiatric effects: Insomnia, anxiety, depression, or psychosis in 5-18% of users; risk higher with abrupt changes.[4]
- GI complications: Peptic ulcers and bleeding, especially combined with NSAIDs; perforation risk in severe cases.[1][5]
Adrenal Suppression and Withdrawal
Chronic use suppresses the adrenal glands, leading to insufficiency if stopped suddenly. Tapering is essential to avoid crisis symptoms like fatigue, hypotension, and nausea.[2][3]
Factors Influencing Risk
Higher doses (>7.5 mg/day), longer duration (>3 months), older age, and comorbidities amplify dangers. Lowest effective dose with periodic breaks minimizes issues; bone density scans and calcium/vitamin D supplements are standard preventives.[1][4]
Sources
[1]: Mayo Clinic - Prednisone Side Effects
[2]: UpToDate - Glucocorticoid Withdrawal
[3]: American College of Rheumatology - Glucocorticoid-Induced Osteoporosis
[4]: NEJM - Adverse Effects of Glucocorticoids
[5]: NIH - Corticosteroid Side Effects