Objective:To prepare Huangbai pellets,optimize formulation and investigate dissolution in vitro Methods:Huangbai pellets were prepared using extrusion-spheronization.The effect of excipients on plastic process was investigated to obtain optimal formulation.The dissolution of baicalin berberine from the pellets were determined by HPLC.Results:Huangbai pellets prepared presented perfect sphericity,narrow diameter distribution and yield over 82%.in vitro dissolution of and baicalin berberine were more than 88%...