We've known for a long time that CQ and HCQ are generally safe as they're given as antimalarials. Heart arrhythmias are certainly a concern for long term use (s

We've known for a long time that CQ and HCQ are generally safe as they're given as antimalarials. Heart arrhythmias are certainly a concern for long term use (such as in lupus), or for people with an existing heart condition. Based on all the papers I've consumed, I think it is likely that CQ/HCQ will reduce the length that a normal, healthy adult will be contagious and that it is probably worth giving as a prophylaxis or early on in an infection to slow down the spread of the disease (going from 14 days of contagiousness is much worse than 4 days of contagiousness). But it is highly unlikely that this is some sort of panacea for later stages of the infection or in older adults.