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Although it has been repeatedly claimed that HCQ has a longstanding safety track record for many decades in use, we present counterarguments for this contention due to disease-drug and drug-drug interactions. We discuss the molecular mechanisms and the cumulative epidemiological evidence of HCQ cardiac toxicity.COVID-19, caused by the novel coronavirus SARS-CoV-2, is an abbreviated name for coronavirus disease 2019. COVID-19 became a global pandemic in early 2020. It predominantly affects not only the upper and lower respiratory tract, but also multiple org