Chapter 1 Brief history, pathophysiology, transmission of SARS-CoV-2 virus, and recent advances on transition metal complexes and nanocomposites as the potent antiviral agents from COVID-19 perspectivesChapter 2 Nanocarriers as Drug Delivery VectorsChapter 3 Cocrystals and their induced activity of drugsChapter 4 An Introduction on Evolution of Azole Derivatives in Medicinal ChemistryChapter 5 Overview on Biological Activities of Thiazole DerivativesChapter 6 Overview on Biological Activities of Imidazole DerivativesChapter 7 Overview on Biological Activities of Pyrazole DerivativesChapter 8 An Overview on Biological Evaluation of Tetrazole DerivativesChapter 9 An Overview on Biological Activity of Benzimidazole DerivativesChapter 10 An overview on Biological Activities of Oxazole, Isoxazoles and 1,2,4-oxadiazoles DerivativesChapter 11 An Overview on Biological Activities of 1,2,3-Triazole Derivatives