"my doctor prescribed 37.5 mg to me.  i took one at 3:00p.m. and by 7:00p.m. i was feeling dizzy and nauseous.  i actually was able to fall asleep but woke up several times during the night with horrible nausea, shaking, anxiety, weird dreams, and the a lot of gas!  thank goodness i had zofran for nausea or i would have thrown up. i also had to take an ativan for the anxiety and imodium for diarrhea.  it&#039;s now 5:00p.m. the next day and i&#039;m just now feeling better. i know others who use effexor and love it so it does work for some....just not for me.  i called the doc and she quickly switched me to something else."