What is the purpose of a prophylactic drug?

The purpose of a prophylactic drug is to prevent or decrease the severity of a disease. Prophylactic medications are used as a preventive measure to protect against potential health problems or complications. For example, vaccines act as prophylactic agents by preparing the immune system to fight off specific infections before they occur. Additionally, medications like those prescribed to prevent blood clots or manage the risk factors that lead to heart attacks and strokes also serve a prophylactic purpose, aiming to reduce the likelihood or severity of diseases or adverse health events.

Options that focus on enhancing effects of medications, relieving symptoms, or diagnosing conditions do not align with the primary intent of prophylactic drugs, which is exclusively about prevention.