r35, exactly. It doesn't HAVE to be either/or. If I get Covid-19, I want EVERYTHING... hydroxychloroquine, azithromycin, Avigan/favipiravir, AND tocilizumab. Someday, when we've had time to find more/better drugs, I could be picky. Right now, given the opportunity I'd just hedge my personal bets on everything.
If I could get my hands on it RIGHT NOW, I'd unhesitatingly be taking 200mg of HCQ twice/day for a few days, once/day for a few more weeks, then once every 3-4 days thereafter for the next few months as PrEP. Maybe it would work, maybe it wouldn't, but worst-case, I'd be throwing away $10/week on something that would at least reduce my anxiety level as a useful placebo.
The fact is, right now, every last doctor, nurse, and hospital worker in the US who can get their hands (officially, unofficially, or otherwise) on hydroxychloroquine is taking it for PrEP speaks far more loudly about its perceived value than gripes about a lack of clear evidence. "Quality evidence" is what you wait for when there are better options potentially available, or when you have people to experiment upon who can't push back if you say 'no' and stick them in a 'placebo' group. The sad fact is, there are entire poor third-world countries that are going to end up being the control cases for unmedicated, unchecked spread regardless of whether they want to be or not. There's no need to arbitrarily withhold meds from people in wealthier countries just for the sake of creating an artificial 'control' group, because THAT group is coming ANYWAY.
Look at it this way... there's also weak evidence that n-acetylcysteine has much impact on the outcome of pneumonia, or respiratory illnesses in general. People still take shitloads of it, just because it's there, and because at worst, it's throwing away a relatively small amount of money. Ditto for expectorants. Despite marketing to the contrary, there's basically zero quality evidence that guaifenesin actually makes any difference to the outcome of a cold, flu, or pneumonia. People still buy and take shitloads of it every time they get a respiratory infection.
Hell, just look at phenyleprine... the shitty replacement ingredient used in today's OTC decongestants. It has LITERALLY never been formally tested. The FDA allowed its substitution with basically NO evidence that it was even useful, let alone as good as the pseudoephedrine HCl it replaced, and ABUNDANT evidence that it's somewhere between "useless" and "useless, with mildly harmful side effects".
Twenty years ago, we had decongestants that actually WORKED... the ones that used phenylpropanaolamine. Unfortunately, they also caused women to have strokes they wouldn't have otherwise had, so OTC cold medicines were all reformulated. I think the DEA also pushed hard, because PPA could easily be used as an ingredient to make amphetamines (not sure about actual crystal meth, though). Then, 20 years later, the DEA did the same thing with pseudoephedrine (though since it couldn't convince the FDA to ban it due to actual health risks, it settled for making it stupidly expensive, so NOW you have to pay twenty bucks for a dozen tablets, instead of being able to buy a cheap bottle of generic pseudoephedrine tablets big enough to last for 3 years for $1.99.
My point is, there's a LOT of shit we take for respiratory infections that has literally NEVER rigorously had its efficacy proven, and half the stuff in today's "cold medicines" has never even had anybody PRETEND to test its efficacy. Hell, look at all the fucking useless "Homeopathic" shit now sold at otherwise-respectable stores like Walgreens and CVS that is made with LITERAL goddamn fucking WATER, based on fucking "faith" that the historical presence of some molecule in the "foundation" water had some magical effect (seriously. Google "homeopathy" to see just how useless anything with that label is).