AIM:To study the nasal mucosa and mucociliary toxicity of intranasal administration of diazepam and diazepam compounded with menthol.METHODS:The rabbit nasal mucosa model was established by nasal administration with diazepam and its compound recipe containing menthol for a week.Then we investigated the effects on cellular morphology of the nasal mucosa and its recovery after drug withdrawal.RESULTS:The results of histopathologic slide showed that the thickness of epithelial layers had no obvious change when...