Question

A drug has a blood plasma concentration of 20 mcg/ML. Ten hours later, the plasma concentration is 5 mcg/ML. This drug has a half-life of how many hours,

Answer 1

Answer:

$5\text{ hours}$

Explanation:

Here, we want to get the half-life of the dryg

By definition, the half-life refers to the time taken for exactly half the mass of the sample to be lost

let us notice a pattern:

$\begin{gathered} 20\text{ to 10 } \\ 10\text{ to 5} \end{gathered}$

We have a decrease in from 20 mcg/ml to 10 mcg/ml in the first 5 hours, then we have a decrease from 10 mcg/ml to 5 mg/mcl in the second 5 hours

That simply means the half life of the drug is 5 hours