Temoporfin is primarily used in photodynamic therapy (PDT) for the treatment of certain types of cancer, particularly squamous cell carcinoma of the head and neck. It works as a photosensitizer, which, when activated by laser light, produces reactive oxygen species that destroy cancer cells. This targeted approach helps minimize damage to surrounding healthy tissues. Additionally, Temoporfin is being explored for its potential in treating other conditions, such as age-related macular degeneration and certain skin disorders, due to its ability to selectively target abnormal cells. Its application in PDT offers a less invasive alternative to traditional cancer treatments like surgery or radiation.