Exhibit 12 SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES (Dollars in millions) Year Ended December 31, 1999 1998 1997 1996 1995 Income Before Income Taxes from Continuing Operations . . . . . .$2,795 $2,326 $1,913 $1,606 $1,395 Add : Fixed Charges Interest Expense . . . . . . . . . 29 19 40 45 57 1/3 Rentals. . . . . . . . . . . . 22 19 15 12 11 Capitalized Interest . . . . . . . 12 9 15 11 11 Total Fixed Charges. . . . . . . 63 47 70 68 79 Less: Capitalized Interest . . . . . 12 9 15 11 11 Add : Amortization of Capitalized Interest. . . . . . . . 7 7 5 5 5 Earnings Before Income Taxes and Fixed Charges (other than Capitalized Interest) . . . . . . $2,853 $2,371 $1,973 $1,668 $1,468 Ratio of Earnings to Fixed Charges 45 50 28 25 19 "Earnings" consist of income before income taxes and fixed charges (other than capitalized interest). "Fixed charges" consist of interest expense, capitalized interest and one-third of rentals which Schering-Plough believes to be a reasonable estimate of an interest factor on leases.