Amodiaquine, a related compound to Chloroquine, appears to be equipotent in this 2017 study.
At 1 penny per dose, even. Wonder why Big Pharma stooges are so against it?
Interesting to note that Loperamide, the antidiarrhea pill, might confer some protection as well.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5733787/