The most frequent side effects include dryness of mouth, nose and throat, sedation, sleepiness, dizziness and disturbed coordination. Other side effects include urticaria, excessive perspiration, tachycardia, headache, hypotension, anxiety, vertigo, tinnitus, nausea, vomiting, diarrhoea, epigastric pain, irritability, anorexia, tightness of chest and wheezing.