IV therapy is a medical treatment that involves administering fluids, vitamins, and minerals directly into a patient's bloodstream through an intravenous (IV) catheter. This allows for the nutrients to be absorbed quickly and efficiently by the body. IV therapy can be used to address a variety of health concerns, such as dehydration, nutrient deficiencies, fatigue, and jet lag. You must be a trained healthcare professional in order to administer IV therapy.