The color of urine in patients who receive anesthetic gives much medical information to a medical team. So, we must check the urine color and know the cause of discoloration of the urine from anesthetic patients. Green urine is rare indeed and it is a benign potential side effect of propofol; this phenomenon is related to the metabolism of propofol. We experienced green urine from a long-term anesthetized patient who received a continuous infusion of propofol. We report here on this unusual case and we review the relevant literature.