Prednisone

Prednisone is a corticosteroid used to treat inflammation, autoimmune conditions and allergic reactions. It mimics cortisol, a hormone produced by the adrenal glands, to suppress immune response and reduce swelling. Available in 5mg, 10mg, 20mg and 40mg tablets, prednisone requires careful dosing and gradual tapering to prevent adrenal crisis. A valid prescription is required.

Unlike over-the-counter anti-inflammatories, prednisone affects the entire immune system. This makes it effective for systemic conditions but also increases the risk of infections and hormonal disruption. Patients must follow exact dosing schedules and never stop taking prednisone abruptly. Always consult a healthcare provider before starting or changing therapy.

• Dose range: 5mg to 60mg daily, depending on condition severity
• Status: Prescription-only corticosteroid in the United States
• Primary warning: Abrupt discontinuation after prolonged use causes adrenal insufficiency
• Half-life: 2 to 3 hours; biological effects persist for days after the last dose

What Is Prednisone

Prednisone is a synthetic glucocorticoid prescribed for short-term and long-term management of inflammatory disorders. Doctors prescribe it for rheumatoid arthritis, lupus, asthma, COPD, severe allergies, psoriasis and inflammatory bowel disease. It is also used to prevent organ rejection after transplantation and to manage certain cancers alongside chemotherapy.

How Prednisone Works

Prednisone is a prodrug. This means it is biologically inactive until processed by the liver. The liver enzyme 11-beta-hydroxysteroid dehydrogenase converts prednisone into prednisolone. Patients with severe liver disease may have impaired conversion, which is why doctors sometimes prescribe prednisolone directly instead of prednisone.

Once activated, prednisolone crosses cell membranes and binds to cytoplasmic glucocorticoid receptors. The resulting hormone-receptor complex moves into the cell nucleus and alters gene transcription. It suppresses the production of interleukins, interferons and tumor necrosis factor-alpha. These chemicals normally drive inflammation, fever and immune cell recruitment. By silencing their production, prednisone stops the inflammatory cascade at its source.

After oral administration, prednisone converts to prednisolone in the liver. Peak plasma concentration occurs within one to two hours. Biological effects on inflammation and immune suppression can persist for days after the last dose.

Prednisone vs Prednisolone

Prednisone and prednisolone are often confused because they treat the same conditions. Prednisone requires liver activation. Prednisolone is already active. For patients with normal liver function, prednisone and prednisolone produce identical results. Prednisolone is preferred for patients with acute liver failure, severe cirrhosis or hepatitis because their bodies cannot efficiently convert prednisone. Dosing is equivalent milligram for milligram. A 5mg prednisone tablet provides the same therapeutic effect as 5mg prednisolone in patients with healthy livers.

Prednisone vs Dexamethasone

Dexamethasone is another synthetic corticosteroid. It is approximately six to seven times more potent than prednisone on a milligram basis. A 6mg dexamethasone dose equals roughly 40mg prednisone. Dexamethasone has negligible mineralocorticoid activity. This means it causes less fluid retention and sodium imbalance.

Doctors choose prednisone for conditions requiring moderate immunosuppression and gradual tapering. They choose dexamethasone for severe cerebral edema, high-altitude sickness and certain chemotherapy regimens. Prednisone is preferred for outpatient tapering protocols because of its intermediate half-life. Dexamethasone stays active longer, which complicates tapering schedules.

Conditions Treated by Prednisone

Doctors prescribe prednisone for a wide range of inflammatory and autoimmune conditions. Patients researching treatment options online often have one of the following diagnoses:

• Arthritis: Rheumatoid arthritis, psoriatic arthritis and gout flares.
• Respiratory: Asthma, COPD, sarcoidosis and interstitial lung disease.
• Autoimmune: Lupus, multiple sclerosis flares, polymyalgia rheumatica and temporal arteritis.
• Skin: Eczema, psoriasis, severe allergic rashes and pemphigus.
• Gastrointestinal: Crohn’s disease, ulcerative colitis and autoimmune hepatitis.
• Other: Blood disorders, certain cancers, adrenal insufficiency and transplant rejection prevention.

Prednisone Dosage and Strengths

Available Tablet Strengths

Prednisone is manufactured in several tablet strengths to accommodate different treatment plans. Your doctor will select the appropriate strength based on your diagnosis, age and response to therapy. The most commonly prescribed strengths are 5mg, 10mg, 20mg and 40mg tablets.

• 5mg tablets: Used for maintenance therapy and mild inflammatory conditions. Often prescribed for long-term management at low dose.
• 10mg tablets: Standard starting dose for moderate autoimmune flares and allergic reactions.
• 20mg tablets: Common for acute exacerbations, severe asthma attacks and inflammatory bowel disease flares.
• 40mg tablets: Reserved for severe systemic inflammation, short-term burst therapy and certain autoimmune emergencies.

Standard Adult Dosing

Dosing depends on the condition being treated. For mild inflammation, doctors typically start with 5mg to 10mg per day. For moderate autoimmune flares, 20mg to 40mg per day may be prescribed. Severe acute conditions such as asthma exacerbations or allergic emergencies may require 40mg to 60mg daily for three to five days.

Always take prednisone exactly as prescribed. Do not increase the dose without medical supervision. Higher doses increase the risk of adrenal suppression, osteoporosis, high blood sugar and mood changes. Patients should verify they receive the exact strength prescribed by their doctor.

Tapering Protocols

Tapering is mandatory after prolonged use. Stopping suddenly causes adrenal insufficiency because the body stops producing its own cortisol. Symptoms include fatigue, muscle weakness, joint pain, low blood pressure and life-threatening adrenal crisis.

A standard taper reduces the dose by 5mg every three to seven days. For example, a patient on 40mg might taper to 35mg for five days, then 30mg for five days, continuing until reaching 5mg. Some protocols require an even slower reduction below 10mg, dropping by 1mg every week. Never create your own tapering schedule. Your doctor will adjust the speed based on how long you took prednisone, your current dose and your underlying condition. Blood tests may be required to monitor cortisol levels during the taper.

Missed Dose Instructions

If you miss a dose, take it as soon as you remember unless it is nearly time for your next scheduled dose. In that case, skip the missed dose and resume your normal schedule. Never double the dose to catch up. Doubling increases the risk of adrenal suppression and side effects. If you miss multiple doses, contact your doctor. You may need to restart at a lower dose or adjust your tapering schedule.

Pediatric Considerations

Children receive prednisone based on body weight, typically 0.5mg to 2mg per kilogram per day. Long-term use in children can slow growth and delay puberty. Pediatric patients require regular height and weight monitoring. Parents should watch for mood changes, increased appetite and difficulty sleeping.

Side Effects

Common Side Effects

Most patients experience at least one mild side effect during treatment. These usually resolve after tapering or stopping prednisone:

• Increased appetite and weight gain — commonly reported at doses above 10mg daily
• Fluid retention and swelling in the face, sometimes called moon face — frequently observed
• Insomnia or sleep disruption — may occur, especially with morning dosing
• Mood swings, anxiety or irritability — reported in clinical use
• Indigestion, nausea or stomach upset — commonly reported
• Acne and thinning skin — may develop during therapy
• Increased sweating — less commonly reported

Serious Side Effects

Contact emergency medical services immediately if you experience:

• Severe allergic reaction: difficulty breathing, hives, swelling of the face or throat
• Adrenal crisis: severe weakness, confusion, vomiting, low blood pressure, fainting
• Vision changes: blurred vision, eye pain or sudden vision loss
• Signs of infection: fever, persistent sore throat, painful urination, wounds that do not heal
• Blood in stool or vomit, black tarry stools
• Severe depression, hallucinations or suicidal thoughts
• Sudden severe headache or seizures

Long-term high-dose therapy increases the risk of osteoporosis, diabetes, cataracts, glaucoma and heart disease. Regular bone density scans, eye exams and blood sugar monitoring are essential for patients on prolonged therapy.

Who Should Not Take Prednisone

Prednisone is contraindicated in patients with systemic fungal infections. It should not be used by individuals with known hypersensitivity to prednisone or any tablet excipients. Patients receiving live virus vaccines must avoid prednisone during the immunization period and for at least three months afterward. Those with active untreated infections, particularly tuberculosis, require anti-infective therapy before starting corticosteroids. Herpes simplex keratitis is another contraindication because prednisone can worsen viral eye infections and cause perforation.

Warnings and Precautions

Do not take prednisone if you have a systemic fungal infection. Live vaccines should be avoided during treatment and for several months after stopping because the immune system is suppressed. These include measles, mumps, rubella, polio and yellow fever vaccines.

Corticosteroids may activate latent amebiasis in patients who have spent time in the tropics. Strongyloides infestation can worsen with immunosuppression. Use with great care in patients with known or suspected exposure.

Inform your doctor if you have:

• Diabetes or high blood sugar
• High blood pressure or heart disease
• Osteoporosis or history of fractures
• Thyroid disorders
• Kidney or liver disease
• Mental health conditions including depression or bipolar disorder
• Stomach ulcers or gastrointestinal bleeding history

Alcohol increases the risk of stomach bleeding. Limit or avoid alcohol while taking prednisone. Salt intake should be reduced to prevent fluid retention and blood pressure spikes.

Drug Interactions

Prednisone interacts with numerous medications. Always provide your doctor with a complete list of prescriptions, supplements and over-the-counter drugs.

• NSAIDs (ibuprofen, naproxen, aspirin): Increased risk of stomach ulcers and bleeding.
• Anticoagulants (warfarin): Prednisone may inhibit the anticoagulant effect of warfarin. INR monitoring is required.
• Antidiabetic drugs: Prednisone raises blood sugar, requiring dose adjustments for insulin or oral hypoglycemics.
• Diuretics: Combined use can cause dangerous potassium loss.
• Antifungals (ketoconazole): May increase prednisone levels in blood.
• Antibiotics (rifampin): May decrease prednisone effectiveness.
• Seizure medications (phenytoin, phenobarbital): Reduce prednisone concentration.

Prednisone and Pregnancy

Prednisone crosses the placenta. Adequate human reproduction studies have not been done. Animal studies showed adverse effects at multiples of the human dose. Pregnant patients should use the lowest effective dose for the shortest possible time. The possible benefits must be weighed against potential hazards. Consult an obstetrician before starting therapy.

Prednisone passes into breast milk in small amounts. Breastfeeding mothers should monitor infants for signs of slowed growth or adrenal suppression. Consult a pediatrician before nursing while on prednisone.

Overdose Information

Overdose symptoms include severe muscle weakness, vision problems, severe headache, swelling, shortness of breath, seizures and loss of consciousness. An overdose requires immediate emergency medical attention. Do not induce vomiting unless instructed by poison control.

Chronic overdose from prolonged high-dose therapy causes Cushing syndrome: rounded face, central obesity, purple stretch marks, thin skin and muscle wasting. Treatment involves gradual dose reduction under endocrinologist supervision.

Storage and Handling

Store prednisone at room temperature between 20C and 25C (68F to 77F). Keep the container tightly closed and away from moisture, heat and direct light. Do not store in the bathroom. Keep out of reach of children and pets.

Dispose of expired or unused medication through a pharmacy take-back program. Do not flush prednisone down the toilet unless specifically instructed.

Frequently Asked Questions

Sources and References

• FDA DailyMed — Prednisone Prescribing Information (Strides Pharma Inc., 2025)
• NIH MedlinePlus — Prednisone Drug Information
• PubMed — Glucocorticoid Therapy Guidelines
• CDC — Vaccine Recommendations for Immunosuppressed Patients