From 2011:
Ivermectin, 'wonder drug' from Japan: the human use perspective
… It is now being used free-of-charge as the sole tool in campaigns to eliminate both diseases globally.
This paper looks in depth at the events surrounding ivermectin's passage from being a huge success in Animal Health into its widespread use in humans, a development which has led many to describe it as a "wonder" drug. …
So Ivermectin went from being used 'free-of-charge' globally to $10/pill between 2011 and now. Sweet.
https://pubmed.ncbi.nlm.nih.gov/21321478/