venlafaxine

Side effects

The adverse effects of this medication are dizziness, dry mouth, insomnia (lack of sleep), nervousness, somnolence (increased sleep), agitation, anxiety, confusion, hypertonia (increased tone), paresthesia (increased numbness), tremor, nausea, sweating, and sexual dysfunction. Anorexia, depersonalization (a state in which one's thoughts and feelings become unreal), agitation,   abnormal dreams, headache, akathisia (it is a movement disorder characterized by a feeling of inner restlessness and inability to stay still), visual disturbances, tinnitus (ringing sound in the ears), tachycardia (increased heart rate), palpitations (increased throbbing of the  heart), hypertension (increased blood pressure), vasodilatation (increased dilatation of blood vessels), dyspnea (shortness of breath), yawning , GI upset, rash, pruritis (intense, severe itching), urinary disorders, menstrual disorders, asthenia (weakness of the muscle), fatigue, chills, raised  cholesterol, weight change. Rarely, neuroleptic malignant syndrome and  GI bleeding may also be seen with the use of this drug.  There are reports of hyponatremia (decreased sodium) and SIADH (a condition in which there is a retention of water in the body).