One letter apart, one metabolic step apart, and almost always clinically interchangeable. The prednisone vs prednisolone distinction confuses patients because the names sound similar and the doses are identical, yet pharmacists and liver specialists treat them as two different drugs for good reason. Prednisone is actually a prodrug that your liver converts into prednisolone, which is the molecule that does the work. For a broader look at how corticosteroids fit into managing inflammation and autoimmune disease, see our medical conditions guide. In most people, you can swap 5 mg prednisone for 5 mg prednisolone without any clinical change. In people with severe liver disease, prednisolone is preferred because the conversion step is impaired.
Prednisone and Prednisolone: Quick Comparison
Both drugs are synthetic corticosteroids approved by the FDA for inflammatory, allergic, autoimmune, and neoplastic conditions. Prednisone is available as oral tablets (1, 2.5, 5, 10, 20, 50 mg) and oral solutions. Prednisolone comes as oral tablets, oral solutions (including the popular pediatric formulation Orapred), and ophthalmic suspensions. Both are typically taken once daily in the morning.
How Each One Works
Prednisone itself is inactive. After an oral dose, it travels to the liver where 11-beta-hydroxysteroid dehydrogenase converts it into prednisolone, the biologically active form. Prednisolone then binds to intracellular glucocorticoid receptors and modulates gene transcription, producing the familiar anti-inflammatory and immunosuppressive effects.
Prednisolone, taken directly, skips the conversion step. Cleveland Clinic notes this distinction matters only when liver function is impaired enough to slow the conversion. In healthy patients, the conversion happens rapidly and nearly completely.
Effectiveness: Head-to-Head Research
At equal doses, both drugs produce equivalent clinical outcomes in patients with normal liver function. Trials for inflammatory bowel disease, asthma, rheumatoid arthritis, and nephrotic syndrome routinely use either interchangeably. A PubMed review of corticosteroid pharmacology describes the two as biologically equivalent in healthy adults.
In pediatric asthma exacerbations, prednisolone oral solution is preferred because it is palatable and dosing is easier to titrate by weight. Most protocols, including those cited by AAFP, use prednisolone in children for this reason.
Side Effects Compared
Identical. Both drugs share the corticosteroid side effect profile: insomnia, mood swings, increased appetite, weight gain, elevated blood sugar, hypertension, fluid retention, muscle weakness, osteoporosis, cataracts, skin thinning, and adrenal suppression with prolonged use.
Short courses (under two weeks) rarely cause serious problems. Long courses (over four weeks) warrant bone health monitoring, blood pressure checks, and blood sugar testing. See our methylprednisolone vs prednisone breakdown for steroid comparison details.
Dosing and How to Take Each
Dosing is identical. A typical adult course for moderate inflammation is 40 to 60 mg daily for 5 to 14 days. Pediatric dosing is 1 to 2 mg per kilogram per day (up to 60 mg) divided once or twice daily. Both drugs should be taken with food to reduce stomach upset and in the morning to match the body’s cortisol rhythm.
Courses longer than two to three weeks require a taper to avoid adrenal insufficiency when stopping.
Which Is Better for Liver Disease or Children?
For patients with severe liver disease (cirrhosis, hepatic failure), prednisolone is preferred because it bypasses the hepatic conversion step. In these patients, prednisone absorption is normal but conversion to active prednisolone may be impaired, leading to unpredictable drug levels.
In pediatrics, prednisolone oral solution is the usual choice because the liquid formulation is easy to dose and tastes tolerable. Prednisone liquid exists but is less commonly prescribed in kids.
Cost and Availability
Both are inexpensive generics. Prednisone tablets typically run $10 to $20 for a 30-day supply. Prednisolone tablets run about the same, though prednisolone oral solution (Orapred, Pediapred) is slightly more expensive at $20 to $50 depending on concentration and quantity. Both are prescription-only in the US.
Drug Interactions and Warnings
Both drugs interact with NSAIDs (GI bleeding), live vaccines (avoid during therapy), warfarin, insulin and other diabetes medications, and CYP3A4 inhibitors and inducers. Long-term use of either can mask infection signs, reactivate latent tuberculosis, and suppress the HPA axis. Never stop a long course abruptly.
When to seek emergency care: Call Poison Control (1-800-222-1222) or go to the ER immediately if you have taken more than the recommended dose of either medication.
Frequently Asked Questions
Is prednisone the same as prednisolone?
Clinically in healthy adults, yes. Prednisone is a prodrug that your liver converts to prednisolone. Dosing is 1:1 in people with normal liver function.
Why is prednisolone used in children?
Prednisolone is available as a palatable oral solution (Orapred, Pediapred) that is easier to dose by weight in young children. Prednisone liquid exists but is less widely stocked.
Which is better for liver disease?
Prednisolone, because it skips the hepatic conversion step. In severe cirrhosis, prednisone absorption may be normal but conversion to active drug can be impaired.
Can you switch from prednisone to prednisolone?
Yes, at the same dose. They are therapeutically equivalent in patients with normal liver function, so 10 mg of either delivers the same clinical effect.
Bottom Line
Prednisone and prednisolone are functionally the same drug at the same dose in the vast majority of patients. The one practical difference is that prednisolone bypasses the liver’s conversion step, making it preferred in severe liver disease and in children who need a palatable liquid formulation. Both share the full corticosteroid side effect profile, so use the lowest effective dose for the shortest necessary duration and taper any course longer than two to three weeks.