**3. Conclusion**

Drug discovery is a multifaceted process that aims at identifying a therapeutic agent that can be useful in treating and managing various ailments. This process includes identification of candidates, characterization, validation, optimization, screening, and assays for therapeutic effectiveness. As the mortality due to cancer is progressively increasing, we need effective therapy to treat breast cancer patients or improve survival. When any pharmaceutical organization starts developing a novel chemical entity for the BC, its cost and attrition rate are very high. Drugs

repurposing is how we can minimize the cost and attrition rate by using the already marketed drugs for a new use. Drug repurposing against breast cancer is one of the best alternatives to treat progressive ailments. In the above discussion, we have discussed various drugs that can be repurposed against breast cancer. It will be a game-changing scenario in the treatment of breast cancer. Certain challenges need to be rectified. However, there is a need for optimization of models and more screening of drugs at preclinical stages.
