This paper aims to analyze the effects that marketing mix variables have on the marketing performance of pharmaceutical manufacturers. It examines how product characteristics, price, marketing channel and promotion effort influence the sales and market share of anti-ulcer drugs in the markets for clinics and hospitals separately. Empirical results from 29 products of anti-ulcer drugs show that sales in hospitals are affected by the profit per prescription to the physician, brand name drugs relative to generics, and the age of ingredients since its introduction to the markets. Profit per prescription to the hospital, relative price, age of ingredients and promotion effort have positive effects on the market share.