Docetaxel Injection is an antineoplastic medication used to treat certain types of cancer. It is a chemotherapy drug that works by stopping or slowing the growth of cancer cells. Docetaxel is typically given intravenously and is used to treat breast cancer, non-small cell lung cancer, advanced stomach cancer, and metastatic prostate cancer. It can also be used to treat head and neck cancer, esophageal cancer, and bladder cancer. Common side effects of docetaxel include nausea, vomiting, hair loss, fatigue, and mouth sores.