Dizziness, somnolence, headache; nasopharyngitis; increased appetite; euphoric mood, confusion, irritability, disorientation, insomnia, decreased libido; blurred vision, diplopia; vertigo; vomiting, nausea, constipation, diarrhoea, flatulence, abdominal distension, dry mouth; muscle cramp, arthralgia, back pain, pain in limb, cervical spasm; erectile dysfunction; peripheral oedema, oedema, abnormal gait, fall, drunk feeling, abnormal feeling, fatigue; increased wt.