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Hydroxychloroquine is an antimalarial drug also known for its anti-inflammatory and antiviral effects, which have raised the interest of many researchers for its potential use in COVID-19 patients. It is known that this drug, being able to influence the cardiac repolarization phase with QTc interval prolongation, can be potentially harmful, chiefly in elderly subjects with frailty syndrome, several comorbidities and polypharmacotherapy. Therefore, although electrocardiogram monitoring of QTc prolongation is the focal point for reducing the arrhythmic risk of these patients, in order to identify the most exposed patients, the traditional Comprehensive Geriatric Assessment should be combined with a multiparametric risk score for QTc prolongation.