What prednisone dose is equivalent to 15 mg prednisolone in a patient with normal hepatic function?

Prednisolone 15 mg is Equivalent to Prednisone 15 mg

In patients with normal hepatic function, 15 mg of prednisolone is equivalent to 15 mg of prednisone, using a 1:1 conversion ratio. 1

Standard Conversion Ratio

• The FDA-approved prescribing information explicitly states that 15 mg prednisolone equals 15 mg prednisone when comparing glucocorticoid potency for oral administration 1
• This 1:1 equivalence is the standard conversion used across clinical guidelines and applies to both oral and intravenous routes 2, 1

Pharmacokinetic Basis for Equivalence

• Prednisone is a prodrug that must be converted to prednisolone (the active form) by hepatic 11β-hydroxysteroid dehydrogenase 3, 4
• In patients with normal liver function, this conversion is rapid and nearly complete, with approximately 69% of oral prednisone absorbed and converted to prednisolone within 8 hours 5
• The interconversion between prednisone and prednisolone reaches a rapid equilibrium, resulting in equivalent therapeutic effects at the same milligram doses 6, 7
• Peak serum prednisolone concentrations and area under the curve are similar whether the patient receives prednisone or prednisolone in individuals with normal hepatic function 7

Clinical Application

• For practical dosing purposes, simply use the same numerical dose: if switching from 15 mg prednisolone to prednisone, prescribe 15 mg prednisone 1
• This 1:1 ratio is consistently applied in clinical guidelines, including those from the American Gastroenterological Association and European League Against Rheumatism 8

Important Caveat: Hepatic Dysfunction

• In patients with impaired liver function, prednisolone should be strongly preferred over prednisone because conversion of prednisone to the active prednisolone is significantly impaired 3, 4
• Patients with severely impaired liver function achieve only 53% of the prednisolone concentration after oral prednisone compared to those with mild impairment 3
• If a patient has cirrhosis or active liver disease, directly prescribe prednisolone rather than prednisone to ensure adequate therapeutic effect 3, 4