The infusion will be discontinued if the patient develops signs of respiratory depression (< 8 breaths / min), requires more than simple maneuvers to maintain the airway, develops oversedation or delerium - where a patient is not easily roused by verbal command, sustained hypotension, oxygen desaturation (below 94%), cardiac dysrhythmia or new medical symptoms. In the event of the development of any adverse reaction a referral to the relevant specialist service within the University of Alberta Hospital will be available. Patients will be observed for a period of two hours post infusion and will be free to leave the suite when their vital signs are stable, there are no concerns about level of consciousness and the patient meets the University of Alberta Hospital criteria for discharge form day- surgery. Full recovery from either infusion is anticipated to take less than two hours.51 The patient must be escorted home and must be in the company of a carer for 24 hours. The patient will be instructed not drive or operate heavy machinery for 24 hours post infusion.