- symptoms compatible with covid-19 upon randomization - known allergy to hcq or chloroquine - history of any arrhythmia. - severely reduced lv function (ejection fraction<30%) - retinopathy - pregnancy or breast feeding - concomitant treatment with azithromycin, flecainide, amiodarone, digoxin, procainamide, propafenone, thioridazine, pimozide. - chronic chloroquine/ hcq treatment

- symptoms compatible with covid-19 upon randomization - known allergy to hcq or chloroquine - history of any arrhythmia. - severely reduced lv function (ejection fraction<30%) - retinopathy - pregnancy or breast feeding - concomitant treatment with azithromycin, flecainide, amiodarone, digoxin, procainamide, propafenone, thioridazine, pimozide. - chronic chloroquine/ hcq treatment