Introduction: Nursing is known as one of stressful occupations. Due to the high sensitivity of the nursing, any carelessness and error, has created irreparable damage to the patients, their family and country and economic burden of health care increases. This study investigated the effects of peppermint aroma on the accuracy level of nurses working in intensive care units .

  Methods : In this semi experimental study, 32 nurses who were employed in critical care units were selected through convenience sampling method . They were randomly subjected to peppermint essence and water (as the placebo) as the aromatherapy process in two different days. Before and after each intervention, participants were asked to take Bonardel Test. data were analyzed by SPSS16 software and paired t-test

  Results: The mean ± SD of changes in nurse's accuracy ( before and after intervention) the use of peppermint essential oil has been 8/44 ± 4/65 and placebo 1/07 ± 1/80 . Changes in accuracy in the use of peppermint oil was significantly greater than placebo (p< 0/001).

  Conclusion: Regarding the results of nurses subjected to peppermint essence and the increase in their accuracy, it is possible to apply this essence, for improving the accuracy.