Final answer:
Ondansetron is administered when a patient experiences symptoms of nausea and vomiting, weakness, hypotension, or fatigue.
Step-by-step explanation:
Ondansetron is a medication commonly used to treat nausea and vomiting. If a patient presents with symptoms of nausea and vomiting, it may be an indication to administer ondansetron. Other symptoms that may lead to the administration of ondansetron include weakness, hypotension, and fatigue, which can be associated with certain medical conditions or situations.