An injection of fluid into the nostril with fluid escaping through the nasopharynx out of the mouth. The patient should keep the mouth open and the glottis closed to prevent fluid from entering the throat and bronchus, and should not blow his or her nose during the treatment. The force of the douche, must be moderate. The container should not be suspended more than 6 in (9.2 cm) above the patient. An atomized spray works more quickly.