https://en.wikipedia.org/wiki/Folinic_acid

used to decrease the toxic effects of methotrexate and pyrimethamine

Pyrimethamine [...] is a medication used with leucovorin (leucovorin is used to decrease side effects of pyrimethamine; it does not have intrinsic anti-parasitic activity) to treat the parasitic diseases toxoplasmosis and cystoisosporiasis

OH ffs! Brain worms again?!

These people are very unserious people in serious positions of power.