Well, you’re right that it is not a vaccine, but the jury is still out on whether it’s a prophylactic. Lab results as well as anecdotal evidence indicates that it is.
And if you’ve seen any of the dosage recommendations being used by both those that are treating the coronavirus with hydroxychloroquine and those that are being treated for lupus and rheumatoid arthritis, you would know that they are essentially the same, roughly 400 mg per day with some variation.
Some doctors are also using a zinc supplement paired with the hydroxychloroquine and azithromycin to better take advantage of the ionophoric qualities of HCQ.
I have attached a lab study that indicates hydroxychloroquine indeed does act as a prophylactic:
https://virologyj.biomedcentral.com/articles/10.1186/1743-422X-2-69
Here I have attached a video that walks you through in a very detailed manner why hydroxychloroquine prevents the virus from replicating as well as preventing entry into the cell.
https://m.youtube.com/watch?v=U7F1cnWup9M&feature=share
What disturbs me is the possible confusion of a vaccine that prevents infection with the HCQ treatment that only improves the patient's chances of recovery from the infection.