IRCT20170609034406N6 IRCT 2020-09-23 Tabriz University of Medical Sciences Efficacy of smelling peppermint essential oil on patients with nausea referred to emergency department of Sina Hospital Efficacy of smelling peppermint essential oil on patients with nausea referred to emergency department of Sina Hospital 2019-10-30 anticipated 168 Complete https://irct.ir/trial/50202 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: In this study, Permuted Block Randomization method was used for entering patients in control and treatment groups. Random method and description of each method: simple randomization, block Arrange the accident stages: 1) Determine the volume of each block (blocks of 6) 2) Prepare a list of 90 blocks and assign numbers to them AABBCC(1) ABCBAC(2) ABCCBA(3) ... CBAABC(90) 3) Choosing 28 random numbers between 1 and 90 4) Identification of the Treatment Assignment, Blinding description: This study was conducted in a single blind clinical trial. None of the people distributing drugs and patients were aware of which patients received the drug or placebo of Ondansetron, and were only diagnosed with the numbers given by the system to the patients. 3 Condition 1: nausea. Condition 2: vomiting. Condition 3: pain. Condition 4: Duration of being in the emergency department. Condition 5: Patient satisfaction at discharge from emergency ward. Intervention 1: Intervention group: The first treatment group consists of 56 patients receiving inhaled peppermint essential oil 3 times and oral placebo (which apart from the active ingredient,were similar to ondansetron tablets) for 2 minutes. Intervention 2: Intervention group: The second treatment group consists of 56 patients receiving 4 mg oral ondansetron and inhaled peppermint essential oil 3 times for 2 minutes. Intervention 3: Control group:Control group consists of 56 patients receiving 4 mg oral ondansetron and inhaled saline solution placebo (which apart from the active ingredient,were similar to peppermint essential oil) 3 times for 2 minutes. No - There is not a plan to make this available Justification or reason for not sharing IPD is Threre is no further information