Drugs and QT prolongation:
Among the admission treatments, a total of 125 different drugs were found, involved in a total of 304 prescription lines. Drugs were splitted into the four broad categories as follows: five drugs (13 prescriptions) were contraindicated with HCQ, 22 drugs (47 prescriptions) were not recommended with HCQ, 7 drugs (24 prescriptions) were at risk of promoting QT prolongation by inducing bradycardia or hypokalemia and 91 drugs (220 prescriptions) had no impact on QT prolongation. Drug classes are reported in Table 2.