"i have been taking 100 mg for about 6 years. i had moderate ocd, high anxiety, and then a diagnosis of depression before i started taking pristiq. i have found it has reduced my ocd, anxiety and depression very well. lately though i have been experiencing intrusive self-critical thoughts and excessive bruxosis (teeth grinding). i am 62 and have a heavy work load. my libido has been hugely reduced since starting on pristiq although this may in part be due to menopause. i also occasionally experience what i would call lsd flashbacks, of a benign nature. the images i see, only at night, are of extraordinary beauty and are extremely detailed. when i open my eyes, i can still see the images. has anyone else experienced this?"