I've been on Effexor XR since 2007 for Depression & Anxiety. I switched to the generic Venlafaxine HCL when it became available without a problem & stayed at the same dose for years. I just recently starting filling my prescription on our Military base & they gave me the brand Effexor XR again but since switching back I am experiencing anxiety, agitation, racing thought, & increased depression. Aren't the potencies the same in the brand name & the generic? What could be causing this? I've been on 150mg the entire time.