An IV, short for “intravenous,” is a familiar medical device used by doctors and nurses to administer various medications and other fluids to patients by inserting a needle or tube directly into the patient’s vein. Once the IV is inserted into the vein, it typically is taped to the skin to prevent it from moving or otherwise coming loose. If an IV becomes dislodged from the vein but stays under the patient’s skin, the medication being dispensed can be harmful to the surrounding tissue. This is called an IV extravasation.