Thealoz Duo Gel Single Dose Container 0.4g is an ophthalmic gel in single-dose containers for protection, hydration and lubrication of the dry eye. It is a sterile, non-preservative, hypotonic, liquid gel that promotes long-term hydration of the eye surface. The main ingredients of the preparation are trehalose, sodium hyaluronate and carbomer. Trehalose protects the epithelial cells on the ocular surface, improving their resistance to daily stress of dry environments and tear film changes in a dry eye; it has very high water retention capabilities with both bioprotection and osmoprotection properties. Sodium hyaluronate adds moisture by retaining water to hydrate and lubricate the surface of the eye. Thealoz Duo is a hypotonic formulation (low osmolarity), which means it particularly addresses the hyperosmolarity of the tear film in chronic dry eye to effectively soothe symptoms.