Used in the treatment of various cancers, particularly colorectal and breast cancer. It is an oral chemotherapy agent that works by converting into 5-fluorouracil (5-FU) directly within cancer cells, minimizing damage to healthy tissues. Commonly prescribed for metastatic breast cancer and colon cancer, especially when surgery or other treatments are not suitable. Its oral form allows convenient outpatient treatment compared to intravenous chemotherapy. Often used in combination with other anticancer drugs to enhance effectiveness. Also investigated for use in gastric and esophageal cancers.