Final answer:
The subcutaneous administration route does not result in the most rapid drug action; intravenous administration does.
Step-by-step explanation:
The statement that the subcutaneous administration route results in the most rapid drug action is False. The most rapid drug action is actually achieved through intravenous administration. When a drug is administered intravenously, the concentration peaks very quickly and then gradually decreases, as shown on the graph in Figure 14.7. In contrast, subcutaneous administration involves injecting the drug into the layer of tissue just beneath the skin, which leads to a slower absorption rate and a slower onset of action compared to intravenous administration.