“...TEVA Pharms makes generics of both PQL and AZT and is donating 6 million doses to US starting now to the end of March. Azithromycin is not in short supply, and is not particularly hard to make (Israeli firm TEVA Pharms makes a generic of AZT too, as do about 10 other companies)....”
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Mylan is reopening a shuttered West Virginia manufacturing facility and expects delivery of product beginning in early April. I’m pretty sure the facility is in Morgantown WV. They have necessary “raw materials” on hand for 50 million tabs. This is important because of the possibility of supply constraints on precursor stock.
http://newsroom.mylan.com/2020-03-19-Mylan-Ramps-Up-U-S-Manufacturing-of-Hydroxychloroquine-Sulfate-Tablets-to-Meet-Potential-COVID-19-Patient-Needs
I believe there are 7 to 8 CURRENT manufacturers of Hydroxychloroquine and more gearing up to manufacture.