Well, I was a big guy for a long time, and also quite stupid about ativan. I used to take several ativan AND drink 5 pints before flights. bad idea.
after a lot of losing weight i did the same thing (2mg) and blacked out after only a few drinks. It can be dangerous. I got lucky.
Do not MIX...ever. Ativan has a half-life of 10-20hrs, so I wouldn\'t mess around and wait at least a day.
If you are flying to Vegas from North America, the flight can\'t be more than a 4-5 hours. I would recommend either ativan OR drinks.
.5 isn\'t a lot though, so if you had a flight early in the day and a few cocktails later that night it\'s probably okay. I wouldn\'t risk it myself though....