Top Products Rankings Based on Pharmacy Purchases in October 2000, 1999 & 1998 for 13 leading countries world wide*   Leading Products Overview . A detailed report of sales for the Top 20 Products in 1998 and 1999 is available to buy online. * Source: IMS Monthly Midas. Any use of this information must be sourced to IMS HEALTH. Please note data collection, values and definitions. Monthly View in Depth: - Products - Therapy Areas - Corporations Monthly View by regions Navigate: Market Insight