Did I use the morning-after pill and drink alcohol?

My girlfriend and I had a relationship but no condom, and for prevention we bought the Next Day Pill, she took one at 10:30 and the other at 22:30, my question is, between these two times she had drunk, and did not get to have vomit, the fact that she drank in that interval from one and the other. What is the risk of the pill failing?
Expert answer:

This situation does not change the efficacy of the morning after pill, the efficacy depends basically on the time it takes (in hours) to start the morning after pill after the ratio and ranges from 0 to 80% efficacy.