Gemzar (generic: gemcitabine) is a prescription medication used to treat a variety of cancers including breast cancer, ovarian cancer, lung cancer, and pancreatic cancer.  Gemzar belongs to a group of drugs called nucleoside metabolic inhibitors. It works by killing cells undergoing DNA synthesis and by blocking other cell processes.

This medication comes in an injectable form and is given through a vein (intravenously) by a healthcare provider.

Common side effects of Gemzar include nausea, flu-like symptoms, and fever.