@Pushka Plaquenil is manufactured by Sanofi-Aventis a French Company.Seeing the French Government has banned the export of the drug I assume that it is being manufactured in France.
It is quite likely they manufacture it elsewhere-hopefully so some supplies can get to Australia.They do have a manufacturing plant in brisbane but I doubt Plaquenil made there.
The generic brands almost certainly are manufactured in India and/or China.There is though a large manufacturer of generic drugs in Israel.Sanofi also have announced in February that due to the effects of drug supply by Covid they will also set up as a generic manufacturer in Europe.
Sanofi says the creation of a large, standalone maker of active pharmaceutical ingredients could help ensure that European countries maintain consistent access to drugs in the long-term.
www.barrons.com
Again there certainly are severe side effects from hydroxychloroquine though they can usually be looked for with annual eye exams and ECG and are virtually always reversible after cessation.A safer profile than other DMARDs such as methotrexate.
The vast majority of the trials with hydroxychloroquine are for the treatment of Covid 19.As far as I can tell only 2 looking at it for prevention and then as part of a larger study.