Cough, breath holding, apnea, laryngospasm, increased secretions, pharyngitis, oxyhaemoglobin desaturation (SpO
2 <90%). Bradycardia, HTN, nodal arrhythmia, tachycardia, myocardial ischaemia, headache, conjunctivitis, nausea, vomiting, increased salivation, bigeminy, abnormal ECG, vasodilation, hepatitis, dizziness, agitation, asthma, dyspnea, hypoxia, malignant hyperthermia, perioperative hyperkalemia.