Therapeutic Potentials and Candidates for COVID-19

The current coronavirus disease 2019 (COVID-19) outbreak spread rapidly worldwide. Yet, there is no identifiable antiviral treatment, so an effective drug is urgently needed. Preventive strategies and oxygen therapy are the main practical approaches to prevent and treat COVID-19. Clinical trials are in progress for the antiviral and immunomodulation agents that eventually are being developed for COVID-19 treatment. Pharmacological, immunotherapies, natural-based supplements, biologics, and combination therapies interventions have been established. The concept of drug repurposing was re-visited, and many conventional antivirals or immunosuppresses were evaluated for Efficacy against COVID-19 infection. Even though much has been published, the rapid progression of therapeutic strategies and unpredictable disease alterations necessitates continual information updates. This review defines drug repurposing and summarizes a medication developed for other therapeutic approaches rather than SARS-CoV-2 treatment. Furthermore, we provide data on the effectiveness of traditional Chinese medicines (TCM) on COVID-19. Additionally, biological and advanced Nano-based drug delivery systems are reviewed.