Intravenous (IV) injection delivers medication directly into the bloodstream through a vein. An IV infusion involves a slow drip of medication over time to provide a constant volume of therapy. IV injection allows for quick delivery of large amounts of medication into the bloodstream and rapid action. The procedure involves selecting a suitable vein, preparing the site, inserting a needle, attaching tubing, and monitoring the infusion for complications. While effective, IV injection can cause pain, requires supervision, and risks infection.