Doxorubicin Injection is a chemotherapy drug used in the treatment of various types of cancer. It belongs to a group of drugs called anthracyclines. It works by slowing or stopping the growth of cancer cells. Doxorubicin is given intravenously (IV) in a hospital or clinic setting. Possible side effects of the drug include nausea, vomiting, diarrhea, mouth sores, hair loss, and an increased risk of infection. It may also cause changes in the heart's electrical activity, known as cardiac toxicity. Your doctor will monitor your heart function closely if you receive this drug.