> We know and understand the safety profile of this drug well. To think that all of a sudden it became more dangerous was silly and unreasonable.

COVID patients are different from the patients that normally receive chloroquine and the chloroquine doses used for COVID are also higher. There is also the issue of how chloroquine interacts with other drugs such as azythromycin.

This particular study has its problems but other studies on chloroquine were also starting to suggest that chloroquine could have dangerous side effects.

https://blogs.sciencemag.org/pipeline/archives/2020/05/04/hy...