If an orally administered medicated syrup must be taken every 12 hours because it is down to 6 ¼% of its original strength, what is its half-life?
A)6 hours
B)4 hours
C)3 hours
D)2 hours

Question

Quizplus · Accepted Answer

The syrup is down to 6.25% (which is 1/16) of its original strength in 12 hours. This means it has gone through 4 half-lives (since 1/2^4 = 1/16) in 12 hours. Therefore, the half-life is 12 hours / 4 = 3 hours.

If an Orally Administered Medicated Syrup Must Be Taken Every