Gemcitabine is a chemotherapy medication used primarily to treat various types of cancer, including pancreatic cancer, lung cancer, and breast cancer. It works by interfering with the cancer cell's ability to grow and divide, ultimately leading to cell death. Gemcitabine is often administered through an intravenous (IV) infusion. Common side effects of gemcitabine include nausea, vomiting, and fatigue. Patients may also experience a decrease in blood cell counts, which can increase the risk of infections and bleeding. Regular monitoring by healthcare professionals is essential to manage these side effects effectively during treatment.