Which route of administration will produce the highest concentration in the bloodstream of a drug given at the same dose?

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Multiple Choice

Which route of administration will produce the highest concentration in the bloodstream of a drug given at the same dose?

Explanation:
Delivering the drug directly into the bloodstream bypasses absorption barriers, so the entire dose reaches circulation immediately. This gives 100% bioavailability and the highest possible peak plasma concentration for that dose. Other routes must pass through absorption processes (and, for oral, first-pass metabolism by the liver), so only a portion of the dose shows up in the blood and the peak occurs later or is lower. Subcutaneous and intramuscular injections rely on slower, variable absorption from tissue into blood, often with depot effects that reduce and delay the peak concentration compared with IV.

Delivering the drug directly into the bloodstream bypasses absorption barriers, so the entire dose reaches circulation immediately. This gives 100% bioavailability and the highest possible peak plasma concentration for that dose. Other routes must pass through absorption processes (and, for oral, first-pass metabolism by the liver), so only a portion of the dose shows up in the blood and the peak occurs later or is lower. Subcutaneous and intramuscular injections rely on slower, variable absorption from tissue into blood, often with depot effects that reduce and delay the peak concentration compared with IV.

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