Earlier quoted context omitted.
If the pill retailed for $0.04 in the US could the R&D be recouped? Americans should feel good about high drug prices: that's your aid to the Third World right there. Not the most efficient technique but still better than not doing it at all.
While in general I agree with you that is not the case here. The drug's patent expired decades ago. The issue is that there is only 1 US manufacturer giving them pricing power. It's unclear to me why another drug manufacturer doesn't come in and undercut the price. This is what happens in most other industries. My gut suspects the arduous FDA approval process, but I have no real evidence for this hypothesis.
From the sound of things these diseases were until very recently isolated to poorer countries. Even today, with the increased number of cases, there might not be enough money to be made based on a few sick North Americans to justify tooling up to make a new drug. (Some of that is about FDA regulatory approval, but not much since it's not a new drug. They'd be manufacturing something that has already been tested and approved.)
Ideally the drug company making this thing would just stop being boneheads about pricing. Having this in the news will probably help.