Final answer:
Parenteral administration of fluids and medications is used to control symptoms and provide relief for clients who experience severe vertigo and have difficulty retaining oral medications, food, and fluids.
Step-by-step explanation:
When severe vertigo triggers nausea and vomiting, it becomes difficult for clients to retain medications, food, and fluids ingested orally. In such cases, parenteral administration of fluids and medications is used to control symptoms and provide relief. Parenteral administration involves delivering fluids and medications directly into the bloodstream, bypassing the gastrointestinal system. This ensures that the medications are effectively absorbed and provide prompt relief without being affected by the vertigo-induced nausea and vomiting.