(I've drunk absinthe myself, but that experience didn't help me one bit...)
ETA. Thanks for the answers, I think I need to give my character a little more time to get intoxicated.
---> off to edit the story
ETA2. I've changed the scene drastically enough that I have to design a completely different drink anyway. (Alternate universe, so I'll go with some this world ingredients and some imaginary ones.) I seem to have highly overrated the effects of absinthe because I blissfully forgot that the one time I had it myself, it wasn't exactly the first thing I drank that night... Thank you, now I realize that the absinthe won't work, and that the alcohol takes time to absorb.