Phanquinone is primarily used as an antiparasitic agent, particularly in the treatment of amoebiasis, a condition caused by the parasite Entamoeba histolytica. It works by targeting and eliminating the parasite in the intestines, helping to alleviate symptoms such as diarrhea and abdominal pain. Additionally, it has been explored for its potential antibacterial properties, making it useful in combating certain bacterial infections. Its application is mainly in the medical field, where it is administered in controlled doses to ensure effectiveness while minimizing side effects.