What are the side effects of venlafaxine?
Common venlafaxine side effects include nausea, sleepiness, headache, dry mouth, dizziness, and trouble sleeping. It can also cause constipation, sweating, nervousness or anxiety, weakness or fatigue, and loss of appetite. Sexual side effects may include reduced sex drive, difficulty reaching orgasm, delayed ejaculation, or erectile dysfunction.
Seek emergency medical care if you experience a seizure, trouble breathing, sudden severe eye pain or vision changes, or symptoms of serotonin syndrome (such as fever, agitation, confusion, tremors, and a rapid heartbeat). Severe bleeding or a serious allergic reaction also requires emergency care.
Contact your provider promptly if you notice unusual bleeding or bruising, symptoms of low blood sodium (such as confusion, weakness, or unsteadiness), or signs of a manic episode (such as unusually high energy, racing thoughts, or a reduced need for sleep). Venlafaxine can also increase blood pressure and cholesterol levels, which may require monitoring during treatment.
Important Safety Information: Venlafaxine can increase the risk of suicidal thoughts and behaviors in children, adolescents, and adults under 25 years old. Get immediate medical help if you experience thoughts of suicide, worsening depression symptoms, or unusual behavior changes while taking venlafaxine. Venlafaxine is not FDA-approved for use in children.