In emergencies it is pretty standard procedures to ration essential stuff in limited supplies. Food is regularly rationed during war times. It would not be ridiculous at all to limit the use of an OTC drug to hospitals during an emergency, if there is limited supply (don't know if that's the case with chloroquine).

BTW cloroquine+antivirals is pretty much the first line drug treatment in Italy, at least according to guidelines: http://www.simit.org/medias/1555-covid19-linee-guida-trattam...

I'm pretty sure that doctors dealing with a pandemic have read enough about the treatment options to know the guidelines. But hey, surely that can't know as much as a random guy on the internet.