Which of the following is NOT a factor influenced by the route of drug administration?

The choice indicating that cost of medication is not influenced by the route of drug administration is accurate. While the route of administration can affect the pharmacokinetics of a drug, such as how quickly and effectively it is absorbed and distributed within the body, the cost is determined by other factors. These can include the drug's production, market dynamics, healthcare policy, and distribution logistics.

Thus, the quantity given, rate of absorption, and how medication is distributed are all directly impacted by the method of administration. For example, medications delivered intravenously are typically absorbed more quickly than those taken orally, which can affect both the quantity needed for effectiveness and how the drug is distributed in the body. This contrasts with cost, which remains more abstract and is not inherently tied to how a drug is administered.