Final answer:
The most rapid absorption of a medication is achieved through intravenous (IV) administration.
Step-by-step explanation:
The most rapid absorption of a medication is achieved through intravenous (IV) administration. When a drug is administered intravenously, the medication is directly injected into a vein, bypassing the digestive system and allowing for immediate entry into the bloodstream. This method ensures that the drug reaches its peak concentration in the shortest amount of time.