Background: Since its initial start on December 2019 at Wuhan, China, the coronavirus disease 2019 (COVID19) has been rapidly spreading and labelled as pandemic by World Health Organization. The rate of human to human transmission of COVID-19 is far higher than severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome coronavirus (MERS). With no drugs or vaccines approved for the treatment of the disease, physicians have been using the pre-existing drugs to curb the disease. One potential anti-viral agent currently undergoing numerous clinical trial is remdesivir, a nucleotide analog that inhibits RNA-dependent RNA polymerase of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Objective: In this mini-review, we provide an overview of remdesivir’s journey, mechanism of action, pharmacokinetics, used in patients with COVID-19 under compassionate use principle and clinical trials to understand the effect of remdesivir in the treatment of patients with COVID-19. Conclusion: In this mini-review, we provide an overview of remdesivir’s journey, mechanism of action, pharmacokinetics, used in patients with COVID-19 under compassionate use principle and clinical trials to understand the effect of remdesivir in the treatment of patients with COVID-19.

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Stem bark of Oroxylum indicum (L) (SBOI) is used by ethnic communities of North East India as health tonic and in treating diseases of humans and animals. The objective of this research was to carry out a detailed investigation including total phenolic and flavonoid content, antioxidant, antimicrobial, cytotoxic and apoptotic activities of different solvent extracts of SBOI and to establish correlation between some parameters. Among petroleum ether (PE), dichloromethane and methanol (MeOH) extract of SBOI, MeOH extract contained the highest amount of total phenolic (320.7 ± 34.6 mg Gallic acid equivalent/g extract) and flavonoid (346.6 ± 15.2 mg Quercetin equivalent/g extract) content. In vitro antioxidant activity (IC 50 22.7 lg/ml) was highest in MeOH extract (p [ 0.05) and also a significant inverse correlation was observed between phenolic (r = 0.886)/flavonoid (r = 0.764) content and corresponding DPPH IC 50 . Only MeOH extract inhibited both bacteria and fungi. Although, individual extract showed cytotoxicity on HeLa cells with characteristic features of apoptosis, PE extract caused maximum cytotoxicity (IC 50 of 112.3 lg/ml, p \ 0.05) and apoptotic activity (33.2 % sub-G0/G1 population) on HeLa cells. But, there was a significant non-inverse correlation of the MTT IC 50 with total phenolic (r = 0.812, p \ 0.05)/flavonoid (r = 0.998, p \ 0.05) content in the three solvent extracts. TLC analysis showed three unique compounds in PE extract which may have a role in apoptosis mediated cytotoxicity. These results called for futher chemical characterisation of MeOH and PE extract of SBOI for specific bioactivity.

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