Dizziness, somnolence, headache; nasopharyngitis; increased appetite; euphoric mood, confusion, irritability, decreased libido; ataxia, abnormal coordination, tremor, dysarthria, memory impairment, attention disturbance, paraesthesia, sedation, balance disorder, lethargy; blurred vision, diplopia; vertigo; vomiting, nausea, constipation, diarrhoea, flatulence, abdominal distension, dry mouth; muscle cramp, arthralgia, back pain, limb pain, cervical spasm; erectile dysfunction; peripheral oedema, oedema, abnormal gait, fall, feeling drunk, feeling abnormal, fatigue; increased wt. Stevens-Johnson syndrome.