Taking EFFEXOR XR can cause a potentially life-threatening problem called serotonin syndrome. The risk of developing serotonin syndrome is increased when EFFEXOR XR is taken with certain other medicines. Effexor XR (venlafaxine) is used to treat major depressive disorder, anxiety, and panic disorder. Includes Effexor XR side effects, interactions and indications. Venlafaxine (Effexor) is a potent SNRI for major depression, GAD, and panic disorder. Learn about its blood pressure effects, discontinuation syndrome, and global pricing. Effexor is a serotonin-norepinephrine reuptake inhibitor (SNRI). It works by restoring the balance of certain natural substances in the brain (serotonin and norepinephrine), which helps to improve certain mood problems. Venlafaxine, sold under the brand name Effexor among others, is an antidepressant medication of the serotonin–norepinephrine reuptake inhibitor (SNRI) class. [5][9] It is used to treat major depressive disorder, generalized anxiety disorder, panic disorder, and social anxiety disorder. [9] Find medical information for Effexor XR on epocrates online, including its dosing, contraindications, drug interactions, and pill pictures. Find patient medical information for Venlafaxine (Effexor) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Effexor (venlafaxine) is an SNRI medication approved to treat depression and anxiety. Here's what you should know before taking it, including side effects. Venlafaxine is used to treat depression. It is also used to treat general anxiety disorder, social anxiety disorder, and panic disorder. Venlafaxine belongs to a group of medicines known as serotonin and norepinephrine reuptake inhibitors (SNRI). Effexor (Venlafaxine Hydrochloride) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources.