Nausea and vomitting related to drugs and anesthetic methods are among the important postoperative problems. Nausea and vomitting causing illlness feeling of patient are frequent after surgical interventions, cause increased dissatisfaction of the patient and prolonged discharge period. In this study it was aimed to evaluate the effect of peppermint oil inhalation on postoperative nausea and vomitting.

Purpose and Type of Research The randomized controlled study will be performed on patients undergoing laparoscopic cholecystectomy, which is the most commonly performed surgical procedure, in a general surgery clinic of a training and research hospital.

Nausea and vomitting related to drugs and anesthetic methods are among the important postoperative problems. Nausea and vomitting causing illlness feeling of patient are frequent after surgical interventions, cause increased dissatisfaction of the patient and prolonged discharge period. In this study it was aimed to evaluate the effect of peppermint oil inhalation on postoperative nausea and vomitting. Purpose and Type of Research The randomized controlled study will be performed on patients undergoing laparoscopic cholecystectomy, which is the most commonly performed surgical procedure, in a general surgery clinic of a training and research hospital.

Location of the research This research will be carried out in a 24-bed general surgery clinic of a 250-bed training and research hospital located in western Turkey. In the Surgery Service, nurses work in three shifts, 08:00-16:00, 16:00-24:00 and 24:00-08:00, while the responsible nurse works between 08:00-17:00. In the surgical service, there are a total of 24 patient rooms, all of which are single beds. Clinical routines in the surgery clinic include pharmacological methods and there is no use of complementary therapy methods.

Population and Sample of the Research 60 patients are planned to be included in the study. In the creation of randomization; Experiment and control group will be assigned by computer method. In this way, experimental applications will be continued until the number of patients in both groups is completed. During the trial period, patients who wish to withdraw or need to be excluded from the trial will be excluded.

Research Hypotheses H0. Peppermint oil inhalation has no effect on post-operative nausea. H1. Peppermint oil inhalation has an effect on post-operative nausea. H0. Peppermint oil inhalation has no effect on postoperative comfort. H0. Peppermint oil inhalation has an effect on postoperative comfort.

Inclusion Criteria:

• over 18 years old, 65 years old and under,
• having colonoscopy,
• not having the risk of heart failure and cardiogenic shock (class III and IV),
• not having a history of asthma, eczema and allergies to flowers and plants,
• no peppermint oil allergy,
• no communicative / severe hearing or speech impairment,
• no use of antidepressant, antihistamine, diuretic, hypnotic, benzodiazepine and narcotic derivatives
• ASA score of 1 or 2
• Individuals willing to participate will be included in the study.

Exclusion Criteria:

• Individuals who do not meet the inclusion criteria will not be included in the