What is Venlafaxine? Venlafaxine (brand name Effexor) is an antidepressant that belongs to a class called SNRIs (serotonin-norepinephrine reuptake inhibitors). It’s approved for treating depression and several anxiety disorders [7,9]. Effexor XR (venlafaxine) is used to treat major depressive disorder, anxiety, and panic disorder. Includes Effexor XR side effects, interactions and indications. 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] Effexor (venlafaxine) is an antidepressant that treats certain mental-health conditions. Common Effexor side effects include drowsiness, nausea, and constipation. They often resolve on their own over time. Other possible Effexor side effects include sweating, dry mouth, and anxiety. Increased risk of suicidal thoughts and actions: EFFEXOR XR may increase suicidal thoughts and actions in some children, adolescents, and young adults, especially within the first few months of treatment or when the dose is changed. EFFEXOR XR is not for use in children. Venlafaxine is used in adults to treat major depressive disorder. 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. Venlafaxine (Effexor) is a potent SNRI for major depression, GAD, and panic disorder. Learn about its blood pressure effects, discontinuation syndrome, and global pricing. Find patient medical information for Venlafaxine (Effexor) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings.