The author proposes to prospectively investigate extension of the established antiemetic efficacy of inhaled isopropyl alcohol for undifferentiated nausea in Emergency Department patients to the 30-minute post-intervention point that has been reported to be the frequent juncture of symptom relief. By introducing prolonged intervention, and re-dosing of established benefit, into this research, the author aims to reproduce the sustained antiemetic efficacy of inhaled isopropyl alcohol for undifferentiated nausea as demonstrated for post-operative nausea and vomiting.