The present invention of automatic cap for the side port of IV catheter apparatus comprises a holding ring attached to the dome shaped cap by means of a connection web. A hinge is connected to the holding ring at one side and the dome shaped cap on the other side which opens and closes the cap over the side port of IV catheter apparatus by snap action. Use of an automatic cap as in present invention prevents the displacement of catheter from the vein of the patient while administering the medicine and nourishment in liquid form through the side port. Use of present invention of automatic cap require very little force to open or close the cap making it easier for the medical professional use the IV catheter apparatus.
