>>во многих штатах Америки также ввели по рецепту

>Name one.

Невада
https://thisisreno.com/2020/05/county-reverses-decision-to-file-amicus-brief-regarding-hydroxychloroquine-ban/

Commissioners decided April 21 to file an amicus brief
supporting a challenge by the Nevada Osteopathic Medical
Association to the Nevada State Board of Pharmacy’s
emergency regulation banning the use of choloroquine and
hydroxychloroquine to treat non-hospitalized coronavirus
patients. An amicus brief is a document by a non-party to
a lawsuit that is intended to outline legal arguments for
the benefit of the court.

>Оно было (естественно) запрещено к применению про ковиде
>всю дорогу, как любое непроверенное лекарство

оно было доступно, есличо, в ЕС без всяких рецептов
изначально, запрещай не запрещай

28 мая запретили
https://www.reuters.com/article/health-coronavirus-hydroxychloroquine-fr/eu-governments-ban-malaria-drug-for-covid-19-trial-paused-as-safety-fears-grow-idUSKBN2340A6

PARIS/LONDON/MILAN (Reuters) - European governments moved on Wednesday to halt the use of anti-malaria drug hydroxychloroquine to treat COVID-19 patients, and a second global trial was suspended, further blows to hopes for a treatment promoted by U.S. President Donald Trump.

The moves by France, Italy and Belgium followed a World Health Organization decision on Monday to pause a large trial of hydroxychloroquine due to safety concerns.

On Wednesday, France’s health ministry cancelled a decree in place for nearly two months that had allowed hospital doctors to dispense it in specific situations for COVID-19.