Docel treats breast cancer and sometimes it is used to treat lung cancer, prostate, and head and neck cancer. Docetaxel is a salt composition of docel injection. Docetaxel has severe side effects and it may damage the patient's organ(s) permanently. In case of missed or over-dose, immediately consult the doctor for further advice. Pregnant and breastfeeding women consult the doctor first, then the doctor will prescribe this injection. If you ever had or facing problems such as liver, heart, kidney, or lung problems, inform the doctor at the beginning of the treatment.