A 100-mg dose of drug X is given every 8 hr until SS levels are reached. At SS, the AUC over the dosing interval is 32 (mg/L) x hr. What is the average concentration over that dosing interval? What is the estimated clearance for drug X?
Question
A 100-mg dose of drug X is given every 8 hr until SS levels are reached. At SS, the AUC over the dosing interval is 32 (mg/L) x hr. What is the average concentration over that dosing interval? What is the estimated clearance for drug X?
Solution
The average concentration over the dosing interval can be calculated by dividing the Area Under the Curve (AUC) by the length of the dosing interval. In this case, the AUC is 32 (mg/L) x hr and the dosing interval is 8 hours.
So, Average concentration = AUC / dosing interval = 32 (mg/L) x hr / 8 hr = 4 mg/L
The clearance of a drug can be calculated by dividing the dose by the AUC. In this case, the dose is 100 mg and the AUC is 32 (mg/L) x hr.
So, Clearance = Dose / AUC = 100 mg / 32 (mg/L) x hr = 3.125 L/hr
Therefore, the average concentration over the dosing interval is 4 mg/L and the estimated clearance for drug X is 3.125 L/hr.
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