How do you calculate oral bioavailability (F) using AUC after IV and oral dosing?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare thoroughly for the MDC Pharmacokinetics Exam with our detailed guidance. Utilize flashcards and multiple-choice questions, complete with hints and explanations, to excel in your test!

Multiple Choice

How do you calculate oral bioavailability (F) using AUC after IV and oral dosing?

Explanation:
Bioavailability is the fraction of an oral dose that reaches the systemic circulation. To compare oral exposure to IV exposure on a fair basis, you must normalize by the dose for each route. The right way to do this is to take the AUC for the oral route divided by the oral dose, and then divide that by the AUC for the IV route divided by the IV dose. In formula form: F = (AUC_oral / Dose_oral) / (AUC_iv / Dose_iv). This normalization removes differences due to how much was given and yields a dimensionless fraction between 0 and 1 (or 0–100% when expressed as a percentage). It’s also helpful to note that you can rearrange it as F = (AUC_oral × Dose_iv) / (AUC_iv × Dose_oral) if you prefer a single ratio. For intuition, if you doubled the oral dose but AUC_oral increased proportionally, F would stay the same, illustrating that F reflects the efficiency of absorption, not just how much was given.

Bioavailability is the fraction of an oral dose that reaches the systemic circulation. To compare oral exposure to IV exposure on a fair basis, you must normalize by the dose for each route. The right way to do this is to take the AUC for the oral route divided by the oral dose, and then divide that by the AUC for the IV route divided by the IV dose. In formula form: F = (AUC_oral / Dose_oral) / (AUC_iv / Dose_iv). This normalization removes differences due to how much was given and yields a dimensionless fraction between 0 and 1 (or 0–100% when expressed as a percentage). It’s also helpful to note that you can rearrange it as F = (AUC_oral × Dose_iv) / (AUC_iv × Dose_oral) if you prefer a single ratio. For intuition, if you doubled the oral dose but AUC_oral increased proportionally, F would stay the same, illustrating that F reflects the efficiency of absorption, not just how much was given.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy