Your provider will talk you through the procedure., you will be seated somewhere comfortable for the duration of the therapy. The injection site will be disinfected with a needle placed directly in a vein: typically in the arm. The fluid drips through the catheter and enters your body. Once inside your body, the fluid from the ivy bag is absorbed directly into your bloodstream. During IV therapy you'll need to keep still so you do not stir or dislodge the catheter. Aside from that, you can read, watch TV, or be on your phone during the process.