Bioavailability of oral dexamethasone.

Area of Science:

• Pharmacokinetics
• Drug Bioavailability
• Clinical Pharmacology

Background:

• Dexamethasone is a widely used corticosteroid.
• Understanding the bioavailability of different oral formulations is crucial for therapeutic efficacy.
• Comparative studies ensure consistent drug delivery and patient outcomes.

Purpose of the Study:

• To evaluate and compare the bioavailabilities of dexamethasone tablets and elixir in human subjects.
• To assess the consistency of pharmacokinetic analysis methods for bioavailability determination.

Main Methods:

• Utilized three distinct model-independent pharmacokinetic analysis methods.
• Measured dexamethasone plasma and urinary concentrations using radioimmunoassay.
• Calculated and compared bioavailability percentages for both tablet and elixir formulations.

Main Results:

• No significant differences were observed among the three pharmacokinetic analysis methods.
• The bioavailabilities of dexamethasone tablets and elixir were not significantly different.
• Average bioavailability was 82.6% +/- 17.7% for the elixir and 78.0% +/- 12.1% for the tablets.

Conclusions:

• Both dexamethasone tablet and elixir formulations exhibit comparable bioavailabilities in humans.
• The chosen pharmacokinetic methods provide reliable and consistent bioavailability assessments.
• This suggests interchangeability of these oral dexamethasone formulations.