This is what I could find, and I couldn't find much else.
"Its root is pharmakon which refers to a druggist, pharmacist, poisoner, magician or sorcerer. God clearly states that Pharmakeia (the use of drugs) is a sin in Galatians 5:19-20a; "The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft" (Pharmakeia).... Most Bible scholars have uncritically assumed that this Greek word means "sorcery" or "witchcraft" (as translated in English Bibles). But pharmakeia (from which our word pharmacy comes) originally referred to the use of potions, drugs, and often poisons, generally for evil purposes. Since these concoctions were often thought to have magical properties, the word developed the secondary meaning of "sorcery."
So basically, when the Bible uses the word "pharmekia" it is referring to drugs such as herbs or potions prescribed by Shamans in order to commune with evil spirits. How that word refers to today is hard to tell, because they didn't have the same type of pharmaceutical medicines that we have today. I think common sense would tell you if it was a drug used for healing it would be alright, otherwise, probably not. This would encompass such things as drug abuse as well as the pill and forms of "sorcery" such as ouija boards and the like. That is my personal take on it anyway, but it is still open to interpretation.