Dizziness, somnolence. Nasopharyngitis; increased appetite; confusion, disorientation, irritability, depression, euphoric mood, decreased libido, insomnia, ataxia, abnormal coordination, balance disorder, amnesia, disturbance inattention, memory impairment, tremor, dysarthria, paresthesia, hypoesthesia, sedation, lethargy, blurred, diplopia, vertigo, vomiting, abdominal distension, constipation, dry mouth, flatulence, muscle cramp, arthralgia, back & limb pain, cervical spasm, peripheral oedema, oedema, abnormal gait, fall, feeling drunk & abnormal, fatigue, increased wt.