There are several symptoms in withdrawal, my worst one is like having electric shocks go through my brain, they are not painful but are disturbing. To find out more, just google Effexor. You will find so much information. Make sure you reduce your dose slowly, I was on 300 mg's a day and am now down to 150 with no real problems at all.

Your real withdrawls symptoms from effexor won't happen until you completely stop taking it. I have gone off it twice and my wife once. I went from 250mg to 37.5 with no withdrawl effects and I did it very slowly. Once I stopped they hit. It lasted about a week and a half and I basically felt like I had the flu. I was dizzy, felt sick, very emotional. I did not get brain zaps. I did however go off very slowly. Much slower then doctors tell you do. My wife did what the doctor told her and had them bad. They normally tell you to reduce your dose every week. I did it every 2-3 weeks. You can even break open the 37.5 and take half of the little things inside. My wife did that and it helped her. She broke it down twice after the 37.5.

You are looking at about a week to a week an a half of the physical symptoms. The emotional part lasts a big longer. I would cry at commercials and things a month after being off it. My wife thought I was silly but she experienced it too so she understood completely. Just weird to see a man break down at a commercial I suppose.