T02) Concentration from volume and dose
50. Pharmacokinetics 50.1) PK Basic parameters 50.1.1) Dose, Volume and Concentration
50.1.1.1) Basic parameters Easy 1
Total tried: Correct: Wrong:
If a patient weighing 83 Kg is given 37.9725 mg of drug as an IV bolus, then determine the concentration of the drug in the blood. For this drug, the volume of distribution is 0.25 L/Kg.
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lb equals 1.83 mg kg
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Total volume of distribution (V) for this patient will be:
`0.25 \quad L/(Kg) × 83 \quad Kg = 20.75 \quad L`
Drug quantity (`X_{0}`) =37.9725 mg
Concentration (`C_{0}`) = ?
We know that,
`C_{0}=X_{0}/V`
`therefore C_{0} = (37.9725 \quad mg)/ (20.75 \quad L) = 1.83 \quad (mg)/L`. Ans.