Which of the following are advantages of intravenous administration?

• A. Absorption phase is bypassed
• B. Large quantities can be given pain free
• C. All of the above
• D. Precise, accurate, and immediate onset

Answer: (C)

The main idea being tested is that intravenous administration offers several clear advantages. First, the absorption phase is bypassed because the drug goes directly into the bloodstream, so there’s no delay or variability from crossing biological barriers, leading to a faster and more predictable onset in many cases. Second, large quantities can be given without pain at the tissue site, since the drug is delivered through a vein; this makes IV suitable for infusing fluids or large doses without the discomfort of injections into tissues. Third, the onset is precise, accurate, and immediate because the drug enters the circulation directly and the rate of administration can be controlled, allowing tight control of plasma levels. Put together, these benefits describe why all of the above are considered advantages of intravenous use. (Note: IV administration does have risks and requires vascular access, but these advantages are the reasons it’s chosen in appropriate situations.)