What is a common use of the medication ondansetron?

Ondansetron is primarily used as an antiemetic, which makes it particularly effective in preventing nausea and vomiting associated with chemotherapy. Chemotherapy can often provoke significant nausea due to the cytotoxic effects of the drugs used, which is where ondansetron's role becomes crucial. It works by blocking serotonin receptors in the brain and the gastrointestinal tract that trigger the vomiting reflex, thus providing relief to patients undergoing such treatments.

The other choices do not align with ondansetron's intended applications. For instance, ondansetron is not used for managing anxiety disorders, treating respiratory conditions, or lowering cholesterol, as these require different classes of medications tailored to those specific therapeutic needs. Understanding the specific indications for ondansetron helps ensure that it is used appropriately and effectively in the clinical setting.