2 xanax bars is a shit load
you prolly overdosed but puked it up so you were fine
yeah.. what did you expect to happen?
Personally i've never heard of anybody vomiting off just two Xanax but it does says it can be one of the side effects.
I don't think it's very common.
I've never felt sick to my stomach when taking it.
But who knows, 4mg is a pretty high dose.
What you mentioned, drowsy is common, puking is very uncommon. Side effects, click on link.