Ascaris lumbricoides
Santonin was used from the mid-19th century to the 1950s as an anthelminthic, typically administered with a purgative. Santonin was used in treatment of infestation by the roundworm "Ascaris lumbricoides" and in ascarid parasitoses in general (including threadworm parasitosis). It is ineffective in treatment of tapeworm infestation.