ABSTRACT
AIM:To optimize total flavone of herba epimediumon microporosity osmotic pump tablets by boxbehnken design-response surface methodology. METHODS:Osmotic agent (lactose),dosage of plastificator (dibutyl phthalate),and coating weight gain were selected as key factors of influencing total flavone delivery. Total flavones cumulatiive yield in 12 h and fitting approximation was regarded as the response. Design Expert method useful for the modeling and analysis was to optimize the response. RESULTS:Response surface surface obtained repre-sented maximum one which conformed to the zero-order delivery rate equation. CONCLUSION:Optimal excipient formulation of total epimedium flavone microporosity osmotic pump tablet consists of 0. 18 g of lactose,0. 26 ratio of dibutyl phthalate to acetyl celulose and 7. 7% of coating weight gain.