A shorter half-life is associated with which of the following dosing considerations?

A shorter half-life is associated with which of the following dosing considerations?

• A. Dosed more often
• B. Dosed less often
• C. Causes longer duration of action
• D. Slower onset

Answer: (A)

Shorter half-life means the drug is cleared from the body more quickly, so plasma levels fall between doses. To keep those levels within the therapeutic range, you need to administer doses more frequently. A shorter half-life usually leads to a shorter duration of action, not a longer one, so increasing dosing frequency helps maintain coverage. Onset of action depends more on absorption and distribution than elimination, so half-life doesn’t dictate how quickly the drug starts working. Therefore, the best approach is dosing more often.

Shorter half-life means the drug is cleared from the body more quickly, so plasma levels fall between doses. To keep those levels within the therapeutic range, you need to administer doses more frequently. A shorter half-life usually leads to a shorter duration of action, not a longer one, so increasing dosing frequency helps maintain coverage. Onset of action depends more on absorption and distribution than elimination, so half-life doesn’t dictate how quickly the drug starts working. Therefore, the best approach is dosing more often.