IRCT20180416039326N8 IRCT 2019-08-08 Esfahan University of Medical Sciences Effect of midazolam ,ondansetron and their combination on post strabismus surgery nausea-vomiting Comparing the effect of midazolam ,ondansetron and their combination on post strabismus surgery nausea-vomiting prevention 2019-08-23 anticipated 160 Complete https://irct.ir/trial/32839 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: Randomization will be done by Random allocation software, Blinding description: This is a double blinded study. patients and researchers are unaware of patients groups and type of medication. The medications will be prepared by an anesthetist who is unaware of the patients groups and will be covered by an aluminium foil and encoded by an anesthetist.Demographic information,post surgical nausea and vomiting,patient satisfaction and other variable will be collected by a person who is not aware of the drugs and patients. 3 Strabistmus. Intervention 1: Intervention group 1: The patients in the group one receive 0.75mg/kg intravenous midazolam after the beginning of the anesthesia . Intervention 2: Intervention group 2: Patients in group 2 receive 4mg intravenous ondansetron after the beginning of the anesthesia. Intervention 3: Intervention group 3: Patients in group 3 receive combination of 0.75mg/kg midazolam and 4mg ondansetron intravenously after the beginning of the anesthesia. Intervention 4: Control group: Patient in this group receive 2cc normal saline intravenously after the beginning of the anesthesia. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is a plan to make this available