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Tackling Complications of Coronavirus Infection with Quercetin: Observations and Hypotheses

Coronaviruses are enveloped positive-strand RNA viruses that belong to the Coronaviridae family. According to the World Health Organization, this virus family has led to an international public health emergency. On the basis of existing clinical outcomes of patients suffering from severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and SARS-CoV, it is hypothesized that quercetin can play a potential role in alleviating various symptoms of coronavirus disease 2019 (COVID-19) infection and serve as a supplement to other prescribed anti-viral drugs currently used for the treatment of COVID-19. Quercetin containing medicinal plants can become attractive agents for alleviating various side effects of COVID-19 infection and may potentially affect COVID-19 replication. In this article, we estimated quercetin content, using a RP-HPLC method, in various medicinal plants and propose the possible use of these extracts as health supplements for alleviating different clinical symptoms reported in COVID-19 patients. Also, this article describes the development of a dry powder inhaler (DPI) of quercetin using lactose as a carrier molecule. Moringa oleifera and Glycyrrhiza glabra extracts contain quercetin and can be potentially useful as health supplements for COVID-19 affected patients. The DPI of pure quercetin was found to supply a fine particle fraction of almost 40%, revealing the efficacy of the formulation in the discharge of quercetin into the lungs. Nevertheless, the suggested idea of using quercetin for alleviating side effects of COVID-19 infection does not have any direct experimental evidence. It is therefore believed that these therapeutic strategies may help clinicians to better treat COVID-19 affected patients.