The only real side effect you have to worry about is death. Other than that, alcohol and xanax go pretty well together. A lot depends on your size and amount of xanax you take. But, three beers in 2 hours should be fine. I am still alive, and so is my ex-lawpartner. He used to take 100mg tablets, as needed, which seemed to be one an hour. Then we would go bar crawling after work. And, maybe make it home about 2AM if at all. I would not recommend this to you. This was pure stupidity. Remember, that alcohol makes the effects of the drug (Xanax) much stronger. I had to go to the hospital at the end of many drinking binges to have my stomach pumped. If you are lucky, u will too. If you over do it and fall asleep...bye, bye.