The present invention provides compounds and pharmaceutical compositions adapted to reduce a load of an RNA virus by at least 50%, the virus causing a pathogenic disease in a mammalian subject, the compound adapted to inhibit the formation of S-adenosyl methionine (SAM) in the virus, the compound being a DOT1L inhibitor, wherein the compound has a molecular weight of less than 1000, and a therapeutic index (TI=LD50:ED50) greater than 30 in the mammalian subject.
