Systane Ultra UD is a preservative-free lubricating eye drop solution that comes in 30 single-dose vials. It contains Polyethylene Glycol 400 0.4% and Propylene Glycol 0.3% to provide temporary relief from eye dryness, irritation and burning sensations. This preservative-free formulation is ideal for people with sensitive eyes or those who wear contact lenses. Each single-use vial should be discarded after one use. The drops can be used as needed throughout the day for dry eye relief. Store at room temperature and keep away from direct light. Do not use if the solution appears cloudy or discolored. Consult a healthcare professional if symptoms persist for more than 72 hours.