Absinthe’s effects, despite popular conception, are not due to the wormwood alone.
Absinthe’s constituents consist of a very delicate balance of various herbs, most of which contribute in one way or another to its intoxicating effects. It is a push-me, pull-you effect of the various herbs, as some are of an heightening effect, and others are lowering.
The effect on the individual is subjective, and can best be described as a kind of heightened clarity of mind and vision, mildly ponderous and sparkling, and warmed by the effect of the alcohol. This seems to wear off after 20 or 30 minutes, leaving one with an alcohol buzz. 2-3 glasses of absinthe seems to do the trick. More than that, depending on the proof of the alcohol, absinthe will just make you very drunk.
– Excerpted from the FAQ on OriginalAbsinthe.com