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  1. 1. After a dose of 500 mg of drug X, Vd=40L, Kel=0.1 hr-1,
    a. CalculateCpafter4hr.
    b. What is the half-life of the drug.
    c. When will the drug be completely eliminated?
    d. How many half-lives will the drug take when 50 mg of it remain in the body?

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Related questions

You are a new pharmacy tech at your local hospital. Your first prescription is for a 50 lb little boy, who will take a dose every 8 hours through an IV. The doctor has prescribed the drug in a dose of 20 mg/kg body weight. Unfortunately, the drug is only available in 500 mg containers. Your boss, the pharmacist, tells you to formulate (prepare) the drug by dissolving the 500 mg container in 5.00 mL’s of normal saline. How many mL’s of the drug will you tell the nurse to administer? Using Dimensional Analysis

A drug (CL = 7 L/h, Vd= 140 L) is to be administered as an IV infusion. A steady-state plasma concentration of 1.1 mg/L is desired. Calculate the following:

- infusion rate (Rinf)

- assuming it would take 4 half-lives to achieve the steady-state, how long would it take to achieve this steady-state, tss.


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