Gemcitabine Injection is a highly effective and rapid action chemotherapy drug which is used for the treatment of many different types of cancer which includes breast cancer, lung cancer, pancreatic and ovarian cancer. This medication is highly active in its action and works by slowing down or stopping the growth of cancer cells. It can only be taken by the doctors as the overdose of this medication may lead to the side effects which include mouth sores, drowsiness, muscle aches, nausea, vomiting, diarrhea, and swelling.