Transforming Niclosamide through Nanotechnology: A Promising Approach for Long COVID Management

Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has infected over 770 million people worldwide. The long-term effects of COVID-19 and their management have become important issues. Accumulating evidence indicates that post-COVID-19 syndrome, also known as long COVID, is not limited to respiratory symptoms but affects a wide range of systems, including neurological, cardiovascular, gastrointestinal, musculoskeletal, and reproductive systems etc. The social and economic losses associated with these effects are estimated to reach 3·7 trillion dollars in the United States alone. However, no treatment for long COVID has been developed. Herein, the literature on long COVID is comprehensively reviewed to examine the underlying causes. Additionally, evidence supporting the efficacy of nanoengineered niclosamide is presented, given its ability to counteract the underlying causes. Niclosamide is already Food and Drug Administration (FDA)-approved, and the nanoengineered one is a viable candidate for clinical trials for long COVID.