Inhalation sedation is associated with a set of contraindications, which are cases where the procedure cannot be performed. They include:
First trimester of pregnancy
Lung diseases
Drug addiction or alcoholism
Upper respiratory tract infections or colds
Tonsillar hypertrophy
Mental illnesses and the use of strong medications associated with them
Eating a meal immediately before the procedure (meals should not be consumed for at least 2 hours before the procedure)
Heart conditions in the patient.