Leeches

Source: FCPS
The use of leeches in medicine was officially approved in 2004 and is known to be effective in treating abscesses, painful joints, glaucoma, rheumatic diseases, some venous diseases and thrombosis. Leeches can also be used to help restore blood circulation to veins or body parts that have been reattached.
Bizarre Modern Medical Treatments: Bloodletting

Source: Cellar
Bloodletting is a way of withdrawing large quantities of blood from a patient to cure or prevent illness and disease. It has been in use since the late 19th century, and is still in use today to rid a patient of excess iron or red blood cells.

Source: Believe Or Not
Fecal Bacteriotherapy

Source: Tree Hugger
Fecal bacteriotherapy is a treatment that comes in the form of a series of liquid enemas and is used to cure inflammatory bowel disorders. The bizarre part is the way in which the liquid enema is created – through the use of a poop donor, who, oddly enough, donates his or her own feces. The healthy bacterium from the poop donor’s feces helps the infected patient.