麻黄素是常用的鼻黏膜收缩剂,它能收缩鼻腔黏膜血管,消除黏膜肿胀,改善通气,排出分泌物,缓解鼻塞,用药后可维持2小时以上。临床上常遇到这种现象：鼻咽癌病人放疗过程中由于咽部炎症波及咽鼓管引起鼻塞时,医生给予麻黄素溶液滴鼻,用药后病人很快就能消除鼻塞,但是,有一部分病人不遵医嘱,鼻一塞就滴,每天2～3瓶,导致过量。 Ephedrine is a commonly used nasal mucosal constrictor, it can shrink the nasal mucosal blood vessels, eliminate mucosal swelling, improve ventilation, discharge secretions, relieve nasal congestion, after medication can be maintained for more than 2 hours. This phenomenon is often encountered in clinical practice: During radiotherapy of nasopharyngeal carcinoma patients, due to inflammation of the pharyngitis and nasal congestion caused by the eustachian tube, the doctor gives ephedrine solution nasal drops, the patient can quickly eliminate nasal congestion after medication, but there is a part The patient did not follow the doctor’s instructions and the nose was dripping with a drop of 2 to 3 bottles a day, resulting in an excess.