withdrawal Vertigo - A sensation of dizziness with disorientation and confusion. If the fever goes too Effexor Xr 37.5Mg death can result. Before you begin the spiral down with Effexor , try giving your body what it really wants. About two months after I began the weaning process, after I was totally off the Paxil for a week or so, Effexor Xr 37.5Mg withdrawal symptoms went away. Zoloft withdrawl symptoms can begin within eight hours of a missed dose and can last from one to eight weeks. The information provided should not be construed to indicate Effexor Xr 37.5Mg Effexor Xr 37.5Mg is safe, effective or appropriate. This antidepressant drug information does not endorse Paxil, diagnose patients or recommend therapy. Side affects of effexor. Generally the drugs that are metabolized most quickly cause more severe symptoms, Shelton said. Cases like Wilson's would be virtually nonexistent if physicians took more care in weaning their patients off antidepressants, said Philip Ninan, vice president for neuroscience president. .