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Gravity flow is a common method used to deliver continuous or intermittent intravenous (IV) infusions. This technique relies on the force of gravity to create a pressure differential that allows the fluid to flow from an elevated IV bag through a set of tubing and into a patient's vein. It is particularly beneficial in clinical settings as it does not require any electrical power or mechanical assistance, making it a reliable option for infusing fluids and medications.

In practice, the healthcare provider can adjust the height of the IV bag to control the flow rate, and it is easy to set up and monitor. Gravity flow is frequently used for hydration solutions, antibiotics, and other medications administered over extended periods.

Other methods referenced in the choices, such as oral administration, topical application, and intranasal delivery, pertain to routes of medication delivery that do not involve intravenous access and are unsuitable for continuous or intermittent infusion methods typically required in clinical settings or surgeries.