1 ALLERGAN, INC. EXHIBIT 11 COMPUTATION OF EARNINGS PER SHARE Earnings per share of common stock, including common stock equivalents, have been computed based on the following weighted average number of shares and net earnings: Three Months Ended March 28, 1997 -------------- (in millions, except per share amounts) Weighted average number of common shares outstanding during the period 65.5 Weighted average number of additional shares issuable in connection with dilutive stock options based upon use of the treasury stock method and average market prices 0.6 --------- Weighted average number of common shares including common stock equivalents 66.1 ========= Net Earnings for the period $ 17.8 ========= Primary Earnings Per Common Share $ 0.27 ========= 13