Final answer:
Different routes of drug administration can change the absorption, pharmacology, and therapeutic effects of the drug.
Step-by-step explanation:
The different routes of drug administration can change the action of the drug in various ways. One of the ways is by changing the absorption of the drug. For example, when a drug is administered orally, it needs to pass through the digestive system before it can be absorbed into the bloodstream, which can result in a slower onset of action compared to intravenous administration.
In addition to absorption, different routes of drug administration can also change the pharmacology of the drug. This refers to how the drug interacts with the body and its receptors. For instance, when a drug is administered topically, it may have a localized effect on a specific area of the skin, whereas systemic administration can result in a more widespread effect throughout the body.
The therapeutic effects of a drug can also be influenced by the route of administration. For example, when a drug is taken orally, it may undergo metabolism in the liver before reaching its target site, which can affect its effectiveness.