Which route of administration provides the longest duration of action for a medication?

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Multiple Choice

Which route of administration provides the longest duration of action for a medication?

The route that provides the longest duration of action is transdermal because a patch delivers drug slowly and steadily through the skin, creating a controlled release into the bloodstream. This keeps therapeutic levels going for an extended period, often 24 hours or more, without the peaks and troughs seen with other routes. Intravenous administration delivers medication quickly and, unless given as a continual infusion, ends relatively soon after the dose is finished. Oral absorption can be variable and is affected by digestion and first-pass metabolism, even with extended-release formulations, leading to a shorter overall duration than a well-designed transdermal system. Intramuscular injections release medication from the muscle over time, but typically not for as long as a transdermal patch, unless a depot formulation is used.

The route that provides the longest duration of action is transdermal because a patch delivers drug slowly and steadily through the skin, creating a controlled release into the bloodstream. This keeps therapeutic levels going for an extended period, often 24 hours or more, without the peaks and troughs seen with other routes.

Intravenous administration delivers medication quickly and, unless given as a continual infusion, ends relatively soon after the dose is finished. Oral absorption can be variable and is affected by digestion and first-pass metabolism, even with extended-release formulations, leading to a shorter overall duration than a well-designed transdermal system. Intramuscular injections release medication from the muscle over time, but typically not for as long as a transdermal patch, unless a depot formulation is used.

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