What is Doxorubicin for: This medication is a cytotoxic anthracycline antibiotic, prescribed for treating various types of cancer. It works by killing cancer cells. How does Doxorubicin work: Doxorubicin harms cancer cells causing their death How should Doxorubicin be used: Adult- IV- The recommended dose is 60-75 mg once in 21 days or 30 mg daily for 3 days every four weeks. It comes as solution for injection to be administered by a healthcare provider into the vein.