Systane Ultra UD is a preservative-free lubricant eye drop containing Polyethylene Glycol 400 0.4% and Propylene Glycol 0.3%. It provides temporary relief from eye irritation and burning caused by dryness, with each single-use vial containing 0.7mL of solution. This product comes in convenient single-use vials that are preservative-free, making them ideal for sensitive eyes. The drops should be used immediately after opening each vial and any remaining solution should be discarded. Store at room temperature and keep away from light. If irritation persists for more than 72 hours or if you experience vision changes or eye pain, discontinue use and consult a doctor. Not to be used if allergic to any ingredients. Keep out of reach of children.