Bioavailability Calculations - Determination of F

Question 1. The AUC calculated after an oral tablet (A) of 150 mg was 106.1 mg.hr/L. The apparent volume of distribution and elimination rate constant estimated after this dose was 20 L and 0.2398 hr^-1. After an oral capsule dose (B) of 100 mg the calculated AUC was 100.4 mg.hr/L. The apparent volume of distribution and elimination rate constant estimated after this dose was 16.13 L and 0.2061 hr^-1. Calculate the relative bioavailability of the tablet A with respect to the capsule B.

Question 2. The AUC calculated after an oral tablet (A) of 50 mg was 152.1 mg.hr/L. After an oral capsule dose (B) of 75 mg the calculated AUC was 198.5 mg.hr/L. Calculate the relative bioavailability of the tablet A with respect to the capsule B. Assume that the kel and V values are unchanged between dose administrations. If the absolute bioavailability of the oral capsule is determined to be 0.87 calculate the absolute bioavailability of the tablet dosage form.

Question 3. The total amount excreted into urine as unchanged drug after an oral tablet (A) of 25 mg was 25 mg. After an oral capsule dose (B) of 125 mg the U^∞ was 100 mg. Calculate the relative bioavailability of the tablet A with respect to the capsule B. Assume that the fe value is unchanged between dose administrations. If the absolute bioavailability of the oral capsule is determined to be 0.8 calculate the absolute bioavailability of the tablet dosage form.

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Some Equations:

Equation 18.3.1 Bioavailability, F, Calculated as a Ratio of AUC Values

Equation 18.3.2 Bioavailability, F, Calculated as a Ratio of U^∞ Values

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