People keep saying that about more effective drugs but treating viruses is incredibly hard, and non-specific. Which drugs are you talking about? Ivermectin, mefloquine?
I'm not saying fluvoxamine is bad or anything. By all means use it if you lack access to the vaccine. The FDA isn't dictating what Brazil can do. The point of the vaccine was to get us to a place where we can go back to our normal lives while avoiding the usual catastrophic circumstances that accompany a pandemic.