Dywyddyr: Thanx for the links. The last one indicates that the peak level in the blood stream occurs about an hour after drinking the booze.
This indicates that that 2-3 hours after drinking, there is no alcohol in the intestinal tract. Therefore, it seems safe to take vitamins & perscription drugs (in pill form) 2-3 hours after drinking alcohol.
Careful - what you are saying applies to
one drink, not three. It also varies tremendously by body weight, gender, presence of food in the stomach, gender and genetic factors.
Let's take the other end of your example: two glasses of wine plus your coffee mixed with liqueur. (Which I'm going to estimate as equivalent to one "drink", since you don't specify the amount or proof/percentage of the liqueur) Assuming you were to drink this all at once, which I realize is probably not the case, you would be looking at approximately 6 hours.
BAC peaks for your "average" person in about one hour, pretty much regardless of the amount you drink at once. (within reason) However, it takes about two hours per drink to "metabolize". (this includes the amount lost through sweat, breathing, etc.)
As you are probably aware, 1 beer = 1 glass of wine = 1 shot of 80 proof / 40% liquor. (Approximately. Actual amount is .6 ounces of pure alcohol)
If you really want to get an accurate time you would have to plot the amount ingested on each drink vs time and overlay the curves - so as to take into account the intervals between drinks. Any which way you look at it, your body BAC is going to go down almost precisely .016 every hour. This is the basis for law enforcement (at least in the US) advocating no more than one drink per hour. Of course you have to remember it takes about an hour for the initial absorption to complete before oxidation / metabolism can really commence.
Bottom line, I'm guessing 4-5 hours rather than 2-3 in your case, assuming you're "average" and you're looking for absolute surety.
OTOH, personally I would probably just say the h*ll with it and take the vitamins after a couple of hours (if not simultaneously with dinner), but that's just me, don't try this at home. I'm not real conservative about that sort of thing.
Does this sound right to you, Dywyddyr? (the 4-5 hours, not my personal tendency for self destruction)