More than one state has banned hcq specifically for the treatment of coronavirus, and it's clearly a partly political decision. Based on zero evidence of harm. I understand the need to protect stockpiles of the drug for people who legitimately need it for things like arthritis, but to specifically ban it for the treatment of coronavirus is a great evil that the people will remember I'm sure.
No, it is not banned specifically for the treatment of coronavirus, it is also banned for the use of wart removal, nosebleeds, yeast infections, and any other 'treatment' that has not been found to be an effective treatment.
It is however very much in use for treating very real diseases that it has been found to be a useful medical treatment. And in order to stop people from getting some scrubby doctor to fill a script so they could hoard it making it scare for the patients that actually need it, they have banned it being prescribed.