Sedation, drowsiness, ataxia, memory disturbances, dysarthria, dizziness, headache, constipation, dry mouth, fatigue, irritability, reduced appetite, mental confusion, disorientation, reduced libido, insomnia, body imbalance, abnormal coordination, attention disorders, hypersomnia, lethargy, tremor, blurred vision, nausea, reduced wt, wt gain, amnesia, muscle weakness.