I have been on effexor for 3 years and exactly 5 days I went from 37.5 to nothing. I have experienced the worse dizziness when I move my eyes, nausea, frequent urination, and asthma symptoms. I thought it would get a little better everyday but it hasn\'t. Yesterday I went to my GP and he said I had to drink plenty of water to flush my system out and he prescribed antivert to take care of the dizzines. I still feel the dizziness but it is so much better. My psychiatrist said I would not have any side effects--so much she knows.