The most common side effects are somnolence, insomnia, agitation, abnormal dreams (including nightmares), increases in cholesterol levels, decreased appetite, dizziness, tremor, headache, blurred vision, yawning, nausea, constipation, diarrhea, vomiting, dry mouth, sweating, sexual dysfunction, asthenia, body weight gain.
The less common side effects are arrhythmias, confusion, urinary incontinence, panic attacks, depersonalization, neuroleptic malignant syndrome-like events, peripheral edema, acute glaucoma, hepatic disorders, priapism, tinnitus, extra pyramidal reactions and withdrawal reactions