Daraprim, known generically as pyrimethamine, is used mainly to treat toxoplasmosis, a parasite infection that can cause serious or even life - threatening problems for babies born to women who become infected during pregnancy, and also for people with compromised immune systems, like AIDS patients and certain cancer patients. (nytimes.com)
Imprimis provides a version of pyrimethamine, the active part of Daraprim, combined with leucovorin, a form of B - vitamin folic acid that's recommended to treat toxoplasmosis. (businessinsider.com)
Sulfadoxine - pyrimethamine went next, in the 1960s. (sciencemag.org)