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Intravenous therapy (IV therapy or iv therapy in short) is the infusion of liquid substances directly into a vein. The word intravenous simply means “within vein.” Therapies administered intravenously are often called specialty pharmaceuticals. It is commonly referred to as a drip because many systems of administration employ a drip chamber, which prevents air from entering the blood stream (air embolism), and allows an estimation of flow rate.