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See the DrugPatentWatch profile for ivermectin
Ivermectin was patented by Merck & Co. (MSD) based on work by Satoshi Ōmura of the Kitasato Institute. Ōmura isolated the natural product class (avermectins) and Merck scientists developed and patented the ivermectin compound in the early 1980s. The collaboration earned Ōmura and Merck’s William C. Campbell the 2015 Nobel Prize in Physiology or Medicine. Patents for ivermectin have since expired in many places, leading to generics.
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