Common Side Effects of Effexor (venlafaxine)

Effexor is from a class of drugs known as selective serotonin and
norepinephrine reuptake inhibitors (SSNRIs). It is an antidepressant used
to treat patients suffering from depression. It helps to improve your
energy level and mood; thus, restoring your interest in daily life. It
helps to restore the balance of natural chemicals (serotonin and
norepinephrine) in the brain that may not be balanced in people who suffer
from acute depression.
This medication is effective in treating major anxiety, panic, and
depressive disorder. You might have suicidal thoughts when you first start
taking an antidepressant. Keep a close eye on changes in your symptoms or
mood. Contact your doctor immediately if you experience any new or
worsening symptoms such as anxiety, behavior or mood changes, trouble
sleeping, panic attacks, or if you feel irritable, impulsive, hostile,
agitated, restless, aggressive, more depressed, hyperactive, or have
thoughts about hurting yourself or suicide.