You know, it's funny - I have no visual effects from Vicodin. In fact, according to folks who know me, there doesn't seem to be any coordination or other effect - it just mostly takes pain away (disclaimer - IF I take too strong a dose for the amount of pain I'm in I get sleepy)

You may remember that early this year, I spend 14 days in the hospital, and the first 12 or so of them I was on 6ml of Morphine every 4hrs. No visual effects there either, but it did tend to make me want to nap, which was a GOOD thing, as when I was alseep, I wasn't hurting