I wouldnt have thought so. 2mg is fairly low. Most Docs will give a 5mg tablet, i hade these for flying, they worked first few times, but now i can take 7mg and it only takes the edge of my anxiety. It depends on how stressed and anxious you are in the first place i think. As my anxiety has worsened and now i dont even bother much with valium as it doesnt seem to touch it. Im taking Prozac which im not even sure is working as ive been on it 3 weeks and dont feel much better. So i would say 2mg prob wont make a diff, but if you double up and take 4mg try it at home before hand incase (specially as you are doing a speech) it may make you slur your words and feel a little spaced out. Good luck.