Chapter 1. Drug repurposing: an advance way to traditional drug discovery -- Chapter 2. Drug polypharmacology towards drug repurposing -- Chapter 3. Pharmacovigilance based drug repurposing -- Chapter 4. In silico analysis of cellular interactors of pqbp1 for potential drug repurposing -- Chapter 5. Drug repurposing opportunities in cancer -- Chapter 6. Repurposing of flavonoids as promising phytochemicals for the treatment of lung carcinoma -- Chapter 7. Targeted therapies used in the treatment of non-small cell lung cancer: an overvie -- Chapter 8. Targeting the ubiquitin machinery for cancer therapeutics -- Chapter 9. Repurposing of serotonin pathway influencing drugs for potential cancer therapy and antimicrobial functions -- Chapter 10. Drug repurposing for hematological malignancies -- Chapter 11. Drug repurposing for ent and head and neck infectious and oncologic diseases: current practices and future possibilities -- Chapter 12. Repurposing of immun-modulators for the treatment of cancer with qsar approaches -- Chapter 13. Reverse translational approach in repurposing of drugs for anticancer therapy -- Chapter 14. Therapeutic targeting of antineoplastic drugs in alzheimer's disease: discovered in repurposed agents -- Chapter 15. Repurposing of drugs for the treatment of microbial diseases -- Chapter 16. Repurposing anti-inflammatory agents in the potential treatment of sars-cov-2 infection -- Chapter 17. Repurposing drugs for viruses and cancer: a novel drug repositioning strategy for covid-19 -- Chapter 18. Repurposing of serotonin pathway influencing drugs for potential cancer therapy and antimicrobial functions -- Chapter 19. Drug repurposing for covid-19 therapy: pipeline, current status and challenges -- chapter 20. Deoxy-d-glucose - a repurposed drug for covid-19 treatment -- Chapter 21. Repurposing methylene blue for the management of covid-19: prospects, paradox and perspective -- Chapter 22. Drug repurposing in covid-19 and cancer: how far have we come? -- Chapter 23. Repurposing of doxycycline to attenuate influenza virus pathogenesis via inhibition of matrix metalloproteinases in neutrophils -- Chapter 24. Therapeutic repurposing approach: new opportunity for developing drugs against covid‑19 -- chapter 25. Repurposing drugs for viruses and cancer: a novel drug repositioning strategy for covid-19 -- Chapter 26. Repurposing of therapeutic approaches for the treatment of vitiligo -- Chapter 27. Emerging infections and their management -- Chapter 28. Repurposing of minocycline, a tetracycline antibiotic, for neurodegenerative disorders.