Capecitabine Tablets 500 mg are a prescription medication used to treat certain types of cancer. This medication belongs to a class of drugs called antimetabolites. It works by stopping or slowing the growth of cancer cells. Capecitabine Tablets 500 mg can be taken orally and may be used in combination with other chemotherapy medications. Common side effects of this medication include nausea, vomiting, mouth sores, and diarrhea.