Final answer:
When an IV line becomes dislodged or goes interstitial, the appropriate action is to remove it immediately to prevent any further complications.
Step-by-step explanation:
If an IV becomes dislodged or goes interstitial, the standard procedure is to remove the IV line immediately. Attempting to flush the line with saline, applying pressure, or increasing the flow rate are not recommended actions in this situation, as they can cause further complications. After the IV line is removed, it is important to examine the site for any signs of infiltration or other complications, and then notify a healthcare provider to assess the situation and decide further action.