We do this now.

• Trepanation (drilling or scraping a hole in the skull) to release the demons out. (Seriously, but sometimes worked because of cranial pressure from severe head trauma, they just didn't know that)
• Lobotomy, severing connections in the brain’s prefrontal lobe with an implement resembling an icepick, done up till the 1970's
• Bloodletting ie draining your blood to restore the balance of humors. Just tap an artery and let some blood out till your better.
• Malaria therapy. You got syphilis? We'll give you malaria, cause the fever is so hot and prolonged, it will kill the syphilis.
• Cough syrup used to be made from morphine
• Mercury drops was a common medical tonic.
• Heroin was also a cough syrup as well.
• Leeches anyone? Common up till the 1800's, people used leeches, usually in reference to bloodletting.