EXHIBIT 11 DURA PHARMACEUTICALS, INC. STATEMENTS RE COMPUTATIONS OF NET INCOME PER SHARE IN THOUSANDS, EXCEPT PER SHARE AMOUNTS (UNAUDITED) THREE MONTHS ENDED NINE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, 1999 1998 1999 1998 - -------------------------------------------------------------------------------------------------------------- NET INCOME PER SHARE - BASIC Net Income $ 3,536 $ 2,424 $ 18,884 $ 17,765 -------- --------- -------- --------- -------- --------- -------- --------- Weighted average number of common shares: Common stock 44,138 46,367 44,107 46,216 -------- --------- -------- --------- -------- --------- -------- --------- Net Income per share $ 0.08 $ 0.05 $ 0.43 $ 0.38 -------- --------- -------- --------- -------- --------- -------- --------- NET INCOME PER SHARE - DILUTED Net Income $ 3,536 $ 2,424 $ 18,884 $ 17,765 -------- --------- -------- --------- -------- --------- -------- --------- Weighted average number of common and common equivalent shares assuming issuance of all dilutive contingent shares: Common stock 44,138 46,367 44,107 46,216 Stock options 707 482 905 602 Warrants 617 729 643 829 -------- --------- -------- --------- Total 45,462 47,578 45,655 47,647 -------- --------- -------- --------- -------- --------- -------- --------- Net Income per share $ 0.08 $ 0.05 $ 0.41 $ 0.37 -------- --------- -------- --------- -------- --------- -------- ---------