Dexrazoxane is used in protecting the heart and other tissues from destructive side effects resulting from some cancer drugs. Dexrazoxane (Zinecard brand) is used in women for metastatic breast cancer (women receiving doxorubicin). The Totect brand of Dexrazoxane is used by patients (men and women) in the treatment of a condition referred to as extravasation. Extravasation is a condition that takes place when an injected medicine circulates into the body tissues after escaping the blood vessels. Dexrazoxane works by preventing the damages from free radicals.