I am prescribed 2mg alprazolam x2 daily... I normally go to CVS and have been receiving white bars gg249 which have always worked normally. However CVS pissed me off, I took my business to Walgreen's a few days ago, filled my script, and open bottle, and it's yellow bars, manufacturer Purepac. I have taken these for a few days now and I literally feel no effect! I took an extra one last night and still not even helpful. Is there a problem with this brand? Or is it in my head? It's like they are sugar pills or something! It's really making me upset... Any insight??