#quinacrine

• Atabrine — A historic commercial name for quinacrine (mepacrine), a synthetic acridine-derived drug widely utilized during the mid-20th century as a major antimalarial and antiprotozoal agent. Introduced as an alternative to natural quinine, it played a crucial strategic role during World War II in protecting Allied troops in tropical regions, and was later used to treat giardiasis and certain autoimmune conditions before being replaced by modern less toxic substances.