If one dose of a drug is administered and the drug's half-life in the body is 3 hours,what percentage of the drug would be left after four half-lives?

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Quizplus · Accepted Answer

The half-life is the time required for a drug level to fall to one half of its concentration.The drug concentration would go to 50% ® 25% ® 12.5% ® 6.25% in four half-lives.The information given is more than sufficient to answer the question.One needs merely to count the number of half-lives and divide the percentage drug in half for every half-life passed since the drug was administered.

If One Dose of a Drug Is Administered and the Drug's