Final answer:
The intradermal route is the percutaneous method mentioned in the question, and oral medication is preferred for home administration of an antimicrobial to treat a systemic infection, whereas intravenous or intramuscular injections are administered in healthcare settings.
Step-by-step explanation:
The route of administration is critical in determining how and where a drug will take effect in the body. For the question which of the following preparations is considered to be administered by the percutaneous route? The correct answer is B. Intradermal. This is because the intradermal route involves administration into the dermis, just below the epidermis, which is a percutaneous route of drug administration.
Regarding the question about which route of administration would be appropriate and convenient for home administration to treat a systemic infection, the answer is A. oral. Oral medications are generally preferred for home treatment because they can be easily taken by patients, are often more convenient, and do not require special procedures that might be necessary for injections or intravenous treatments.
When a drug is not easily absorbed in the GI tract or the patient cannot take oral medications, parenteral routes like intravenous or intramuscular injections are used, but these are typically done in healthcare settings.