Final answer:
Ondansetron can be administered orally (PO), intravenously (IV), and intramuscularly (IM). Oral administration is suitable for home use for antimicrobials treating systemic infections, while parenteral routes are used when oral is not viable, usually in health-care settings.
Step-by-step explanation:
Ondansetron can be administered through multiple routes depending on the clinical situation and convenience. The available routes of administration are:
- Oral (PO): This route is convenient and non-invasive, suitable for home administration when the patient can tolerate oral medications.
- Intravenous (IV): For rapid effect and when the patient cannot take medications orally, for example during post-operative care or with severe nausea and vomiting.
- Subcutaneous: Ondansetron is not typically administered subcutaneously.
- Intramuscular (IM): An alternative to IV administration when a quick absorption is needed but IV access is not feasible.
Considering this information, the correct routes of administration for ondansetron are PO (oral), IV (intravenous), and IM (intramuscular).
For home administration of an antimicrobial to treat a systemic infection, the oral route is generally appropriate and convenient. However, if oral administration is not possible due to factors like absorption issues or the severity of illness, parenteral administration (which includes intravenous or intramuscular routes) may be used, albeit typically in a health-care setting due to the need for professional assistance.