Object to study on effect of Biyueshu preventing rats rhinitis medicamentosa.Methods Nasal instillation by decongestant-0.01% naphazoline HCL was used to make rats rhinitis medicamentosa,the same time Biyueshu was used to prevent rhinitis medicamentosa occurance,the 0.09% NS was used as control,and the epithelial hyperplasia and inflammatory cells in nasal mucous membrane were observed.Results Biyueshu can reduce the epithelial hyperplasia and inflannatory cells in rhinitis medicamentosa nasal mucous membrane.Conclusion Biyueshu w...