Murine Natural Relief for Allergies is a preservative free eye mist that provides natural all day relief for allergies - up to 8 hours protection. Features Comes in a contemporary mist spray format. Benefits Murine Natural Relief for Allergies gives you a preservative free and long lasting protection against itchy, irritated and red eyes caused by allergies including hayfever. The simple to use spray mist will give you protection for up to 8 hours. Just spray and go.