Intravenous therapy (IV therapy) is a technique that supplies fluids, medications, and nutrition into a person’s vein. This administration source is basically used for rehydration or to provide nutrition to those that can no consume solid food or water orally. It can also be used for medications such as blood infusions and electrolyte imbalances. This therapy is as old as the 1400s but did not become popular up until the 1900s.