From what I understand, the warning against drugs was against the use of hallicinogens (which were widely used by sorcerers, mediums, etc.) for purposes of the occult or of manipulating others.
Other 'mood altering' drugs of today do not have the same purpose or even ability to so alter one's consciousness the way opium, peyote, LSD, etc. do. This does not mean that one cannot get addicted to a medicinal substance -- I have had to come off addictions to morphine after three surgeries, and it's not fun! Nevertheless, I'm really grateful the morphine was available at the time.
My eldest daughter was diagnosed with Reflex Sympathetic Dystrophy when she was seventeen. This is a malfunctioning of the entire sympathetic -- or autonomic -- nervous system (the part of you that controls sweating, blood pressure, etc.). Although the primary symptom is pain where an old injury has already healed -- pain that just builds and builds -- one of her other problems was the inability to sleep for more than a couple of hours at a time. It was like her 'fight or flight' response was on 'permanent' mode. In order to settle her entire body down, the doctor prescribed an antidepressant called Trazedone (spelling?) in far larger doses than depressed people get -- 800 mg a night. It 'muddied' up her nervous system so the signals were much, much slower and she was able to sleep again.
She is 24 now, and about to celebrate her one year wedding anniversary. She was able to take herself off drugs entirely by monitering herself for a couple of years. She was, by the way, initially on a LOT more than Trazedone!
My youngest son is profoundly retarded. He wakes up in the mornings (I can hear him pounding the wall in his room as I type this, so this will be fast) in 'high gear' and without 20 mg of ritalin in the mornings and 200 mg of Tegretol, he would be out of control the entire day, screaming and hitting things. We don't know why. Normally the ritalin is only needed once in the morning, even though it only lasts about four hours. But it is like "oh, this is what it's like to be calm; I remember!" and he is livable the rest of the day!
I thank God for these medications. Yes, they can be abused, but they also gave me back two of my children.
Now, off to sooth the raging beast!