cross-linked hyaluronic acid + chondroitin sulphate

This drug is a **combination of cross-linked hyaluronic acid and chondroitin sulphate**, commonly formulated as an injectable viscoelastic solution for local administration, particularly in joint or ocular indications. **Hyaluronic acid** is a naturally occurring glycosaminoglycan with high biocompatibility and viscoelastic properties, essential for lubricating and cushioning synovial joints and maintaining tissue hydration. **Chondroitin sulphate** is another glycosaminoglycan found in cartilage, contributing to structural integrity, elasticity, and water retention. In combination, chondroitin sulphate enhances the rheological properties of hyaluronic acid, resulting in improved viscosity, mechanical robustness, and resistance to enzymatic degradation. The **mechanism of action** includes supplementing and restoring the viscoelastic properties of synovial fluid, providing lubrication, shock absorption, and supporting cartilage health, primarily by targeting extracellular matrix structures and binding to cartilage and CD44 cell-surface receptors. Clinically, the combination aims to relieve joint pain, improve mobility in osteoarthritis, and protect tissues during interventions such as cataract surgery[2][3][1].