<p>The following treatment-emergent adverse events may happen: heart rate increased, heart rate decreased, visual disturbance, abdominal discomfort, impaired gastric emptying, irritability, edema, drug withdrawal syndrome, hypersensitivity, involuntary muscle contractions, sensation of heaviness, hypoesthesia, paresthesia, disturbance in attention, sedation, dysarthria, memory impairment, ataxia, presyncope, syncope, coordination abnormal, seizure, urticaria, blood pressure decreased etc.</p>