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“GAAP” refers to financial information presented in accordance with generally accepted accounting principles in the United States. 

In this Annual Report, Allergan included historical non-GAAP financial measures, as defined in Regulation G promulgated by the Securities and Exchange Commission, with respect to the year ended December 31, 2003, as well as the corresponding periods for 2002 through 1999. Allergan believes that its pres- entation of historical non-GAAP financial measures provides useful supplementary information to investors. The presentation of historical non-GAAP financial measures is not meant to be considered in isolation from or as a substitute for results prepared in accordance with accounting principles generally accepted in the United States. 

In this Annual Report, Allergan reported the non-GAAP financial measure “adjusted earnings” and related “adjusted diluted earnings per share.” Allergan uses adjusted earnings to enhance the investor’s overall understanding of the financial performance and prospects for the future of Allergan’s core business 

activities. Specifically, Allergan believes that a report of adjusted earnings provides consistency in its financial reporting and facilitates the comparison of results of core business operations between its current, past and future periods. Adjusted earnings is one of the primary indicators management uses for planning and forecasting in future periods. Allergan also uses adjusted earnings for evaluating management performance for compensation purposes. 

In this Annual Report, Allergan also reported sales performance using the non-GAAP financial measure of constant currency sales. Constant currency sales represent current period reported sales adjusted for the translation effect of changes in average foreign exchange rates between the current period and the corresponding period in the prior year. Allergan calculates the currency effect by comparing adjusted current period reported amounts, calculated using the monthly average foreign exchange rates for the corresponding period in the prior year, to the actual current period reported amounts. Management refers to growth rates at constant currency so that sales results can be viewed without the impact of changing 

