Dizziness, somnolence, increased appetite & wt, euphoria, irritability, decreased libido, disorientation, insomnia, ataxia, abnormal coordination, balance disorder, amnesia, tremor, dysarthria, memory impairment, attention disturbance, paraesthesia, sedation, lethargy, blurred vision, diplopia, vertigo; vomiting, dry mouth, constipation, flatulence, abdominal distension, erectile dysfunction, abnormal gait, drunk feeling, fatigue, peripheral oedema, abnormal feeling.