Gemzar infusion contains the active ingredient gemcitabine, which is a type of chemotherapy medicine for cancer known as a 'cytotoxic antimetabolite'.
Cancers form when cells within the body multiply abnormally and uncontrollably. These cells spread, destroying nearby tissues. Gemcitabine works by stopping the cancer cells from multiplying. It does this by being incorporated into the cells' genetic material, DNA and RNA. Both DNA and RNA are needed for cells to grow, repair themselves and multiply. Gemcitabine causes problems with the production of DNA and RNA in the cancer cells, and this causes the cells to grow in an unbalanced way, resulting in the death of the cells.