Hi, I started taking Effexor, but I am experiencing side effects as loss of appetite, nausea occasionally, mild headaches, and lack of concentration. I wake up frequently during night and get up early in the morning. But, side effects are different for everyone, some people even experience no side effects. Effexor affects the level of serotonin and
norepinephrine in the brain. It belongs to class of drugs called serotonin-norepinephrine
reuptake inhibitor, so it acts by increasing brain activity.
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