Docetaxel Injection 120mg/ 3ml is a chemotherapy medication used to treat certain types of cancers, such as breast, lung, prostate, and stomach cancer. It is administered intravenously (into a vein) by a healthcare professional. It works by slowing or stopping the growth of cancer cells. Common side effects include nausea, vomiting, low white blood cell count, hair loss, and fatigue. More serious side effects may include anemia, low platelets, allergic reactions, and increased risk of infection.