I took a .5 ativan this morning because im going to a garth brooks concert. how long should i wait to have a alcoholic drink?

Ativan has a half-life of 12 hours, so 12 hours after you take it, half is still in your system. Ativan is also addictive and synergistic with alcohol so the regular use of either will cause the same withdrawal symptoms when stopped. Treating combined addiction to alcohol and Ativan is extremely challenging and repeated use of both on the same day will create dependence in as little as two weeks.