Posted by John on Wednesday, November 9, 2011 at 2:00am.
Hydrocodone bitartrate is used as a cough suppressant. After the drug is fully absorbed, the quantity of drug in the body decreases at a rate proportional to the amount left in the body, with constant of proportionality . Suppose that the halflife of hydrocodone bitartrate in the body is 3.7 hours, and that the oral dose taken is 12 mg.
(a) Write a differential equation for the quantity, , of hydrocodone bitartrate in the body at time , in hours, since the drug was fully absorbed.

calculus  Reiny, Wednesday, November 9, 2011 at 8:11am
amount = 12 (1/2)^(t/3.7) where t is in hours.

calculus  Steve, Wednesday, November 9, 2011 at 11:03am
However, to answer the question,
da/dt = ka
The boundary conditions will reveal that
k = ln(1/2)/3.7

calculus  Steve, Wednesday, November 9, 2011 at 11:04am
Oops forgot about the 15. Toss it in as needed.
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