VARILRIX is a vaccine designed to protect against varicella, commonly known as chickenpox, a highly contagious viral infection caused by the varicella-zoster virus. It is administered via injection and is suitable for use in both children and adults who have not previously been vaccinated or contracted the disease. The vaccine works by stimulating the immune system to produce antibodies against the varicella-zoster virus, thereby providing immunity or reducing the severity of the infection if exposed to the virus in the future. VARILRIX is generally well-tolerated and considered an effective means of preventing chickenpox, a disease that can lead to serious complications, especially in adults, pregnant women, and individuals with weakened immune systems.