Prednisone (Deltasone) is an oral corticosteroid used across a broad range of inflammatory, allergic, autoimmune, and neoplastic conditions — including asthma exacerbations, rheumatoid arthritis, lupus, inflammatory bowel disease, lymphomas, and organ transplant rejection prophylaxis. A prodrug converted to active prednisolone by the liver, it binds glucocorticoid receptors and suppresses gene transcription of pro-inflammatory cytokines. Common side effects include weight gain, fluid retention, elevated blood sugar, mood changes, and insomnia. Long-term use causes adrenal suppression — abrupt discontinuation after prolonged therapy is dangerous and can cause life-threatening adrenal crisis; dosing must always be tapered gradually under medical supervision.
Prednisone
Prednisone is a synthetic corticosteroid with potent anti-inflammatory and immunosuppressive properties. It is one of the most versatile medications in medicine, prescribed across dozens of conditions ranging from acute allergic reactions to chronic autoimmune diseases.
Uses & FDA Indications
Prednisone is approved for a broad range of inflammatory, allergic, hematologic, neoplastic, and autoimmune conditions. It is considered a cornerstone therapy across multiple medical specialties.
- Allergic conditions — severe seasonal allergies, drug hypersensitivity, contact dermatitis
- Respiratory diseases — asthma exacerbations, COPD exacerbations, sarcoidosis
- Autoimmune diseases — rheumatoid arthritis, lupus (SLE), polymyalgia rheumatica
- Inflammatory bowel disease — Crohn's disease, ulcerative colitis (acute flares)
- Skin conditions — severe psoriasis, pemphigus, Stevens-Johnson syndrome
- Hematologic conditions — idiopathic thrombocytopenic purpura (ITP), hemolytic anemia
- Neoplastic diseases — lymphomas, leukemias (as part of chemotherapy regimens)
- Organ transplant — prevention of rejection (often combined with other immunosuppressants)
- Neurological conditions — multiple sclerosis exacerbations, Bell's palsy
- Adrenal insufficiency — replacement therapy for Addison's disease
How It Works
Prednisone is a prodrug — it is biologically inactive until the liver converts it to prednisolone, the active form. Prednisolone exerts its effects by entering cells and binding to glucocorticoid receptors (GRs) in the cytoplasm.
The drug-receptor complex then migrates into the nucleus, where it binds to glucocorticoid response elements (GREs) on DNA. This directly alters gene transcription — increasing the production of anti-inflammatory proteins while suppressing the genes encoding pro-inflammatory cytokines (IL-1, IL-6, TNF-alpha) and enzymes (COX-2, phospholipase A2).
Prednisone has both genomic effects (gene-level changes that take hours to develop) and non-genomic effects (rapid membrane-level actions that occur within minutes). The combination of these mechanisms accounts for its powerful and wide-ranging effects on inflammation and immune function.
By suppressing the entire inflammatory cascade and dampening immune cell activity (T cells, B cells, macrophages, eosinophils), prednisone can rapidly control symptoms in conditions driven by immune overactivity — but this systemic suppression also accounts for many of its significant side effects.
Side Effects
Common
- Increased appetite and weight gain
- Fluid retention and edema
- Mood changes — anxiety, irritability, euphoria, or depression ("steroid mood swings")
- Insomnia
- Blood sugar elevation (hyperglycemia); can precipitate or worsen diabetes
- Increased susceptibility to infections
- Stomach upset, heartburn
- Skin thinning, easy bruising
Serious
- Adrenal suppression — long-term use suppresses natural cortisol production; abrupt stopping can cause adrenal crisis (life-threatening)
- Cushing's syndrome — moon face, buffalo hump, central obesity, striae with chronic high-dose use
- Osteoporosis — significant bone loss with prolonged use; increased fracture risk
- Avascular necrosis (osteonecrosis) — bone tissue death, most commonly in the hip
- Cataracts and glaucoma — with prolonged use
- Severe psychiatric effects — psychosis, mania (rare but serious)
- Peptic ulcers and GI bleeding — especially when combined with NSAIDs
- Opportunistic infections — PCP pneumonia, fungal infections with prolonged immunosuppression
Drug Interactions
| Drug / Class | Interaction | Clinical Significance |
|---|---|---|
| NSAIDs (ibuprofen, naproxen) | Additive GI irritation and ulceration risk; significantly increases peptic ulcer incidence | High — avoid combination or add GI protection |
| Warfarin | Variable effect on anticoagulation; prednisone can either increase or decrease INR | Moderate — monitor INR closely during initiation/cessation |
| Antidiabetic agents (insulin, metformin) | Prednisone raises blood glucose; may substantially increase insulin or oral agent requirements | High — monitor blood glucose frequently |
| CYP3A4 inducers (rifampin, phenytoin, carbamazepine) | Accelerate prednisone metabolism, reducing its efficacy | Moderate — dose adjustment may be needed |
| Live vaccines | Immunosuppression increases risk of vaccine-strain infection; live vaccines contraindicated during significant prednisone use | High — avoid live vaccines |
| Fluoroquinolone antibiotics | Concurrent use significantly increases risk of tendon rupture | Moderate — monitor for tendon pain |
| Diuretics (furosemide, thiazides) | Additive potassium loss; hypokalemia risk | Moderate — monitor electrolytes |
Warnings & Contraindications
⚠ NEVER stop prednisone abruptly after prolonged use. Long-term corticosteroid use suppresses the adrenal glands' ability to produce cortisol. Sudden discontinuation can cause adrenal insufficiency — a potentially life-threatening emergency with symptoms including severe fatigue, low blood pressure, vomiting, and collapse. Always taper under medical supervision.
- Infections: Prednisone can mask signs of infection and reduce the ability to fight pathogens. Avoid use in patients with systemic fungal infections. Screen for latent tuberculosis before long-term use.
- Diabetes: Prednisone causes significant blood sugar elevation; diabetic patients require closer monitoring and often need medication adjustments.
- Bone health: Patients on chronic corticosteroids should receive calcium and vitamin D supplementation and be assessed for osteoporosis risk. Bisphosphonate therapy may be indicated.
- Psychiatric history: Steroids can trigger or worsen psychiatric conditions including psychosis, mania, and depression. Use with caution in patients with mental health histories.
- GI protection: Consider proton pump inhibitor (PPI) co-prescription when combining with NSAIDs or in patients with prior peptic ulcer disease.
FAQ
Why do I need to take prednisone in the morning?
The body naturally produces cortisol (the hormone prednisone mimics) in a diurnal pattern, peaking in the early morning. Taking prednisone in the morning — ideally with food — aligns with this natural rhythm, helps minimize sleep disruption, and reduces the degree of HPA axis suppression compared to evening dosing.
Why can't I just stop taking prednisone when I feel better?
Even a few weeks of prednisone use begins suppressing the adrenal glands' natural cortisol production. Stopping abruptly leaves the body without enough cortisol to meet its metabolic needs, which can cause adrenal crisis — a medical emergency. Gradual tapering allows the adrenal glands time to resume normal function.
Will prednisone make me gain weight?
Weight gain is one of the most common complaints with prednisone. It occurs through several mechanisms: fluid retention, increased appetite, and redistribution of fat to the face, neck, and abdomen. Short courses typically cause modest, temporary weight changes. Longer courses can cause more significant weight gain. Reducing sodium and processed food intake may help limit fluid retention.
Can prednisone affect my mood?
Yes — corticosteroids are well-known for causing psychiatric and mood effects, ranging from mild anxiety and irritability to euphoria, insomnia, and in rare cases, steroid psychosis (hallucinations or mania). These effects typically resolve once the medication is tapered. Contact your provider if mood changes are severe or interfere with daily functioning.
Need to identify a prednisone tablet by its imprint, shape, or color?
Use the PillID Pill Identifier →