Which anesthetic agent cannot be utilized in an IV-only anesthesia plan?

Halothane is a volatile anesthetic agent, typically administered via inhalation rather than intravenously. It is chemically designed for use in a gas form, making it unsuitable for an intravenous (IV)-only anesthesia plan. In contrast, the other agents listed—Propofol, Ketamine, and Midazolam—are all effective when given intravenously and are commonly used in various anesthesia protocols. This distinction is crucial for ensuring the appropriate delivery method for anesthetics, as utilizing the correct administration route affects the anesthetic depth and patient safety during procedures.