Exhibit 12



                     SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES
                  COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
                               (Dollars in millions)



                                              Year Ended December 31,         
                                          1997     1996      1995      1994      1993
                                                              


Income Before Income Taxes from
   Continuing Operations . . . . . .  $1,913   $1,606    $1,395    $1,227    $1,073

Add : Fixed Charges
  Interest Expense . . . . . . . . .      40       45        57        56        48  
  1/3 Rentals. . . . . . . . . . . .      15       12        11         9         8   
  Capitalized Interest . . . . . . .      15       11        11        11        13 
    Total Fixed Charges. . . . . . .      70       68        79        76        69   

Less: Capitalized Interest . . . . .      15       11        11        11        13  
Add : Amortization of
 Capitalized Interest. . . . . . . .       5        5         5         4         4 

Earnings Before Income Taxes and
 Fixed Charges (other than
 Capitalized Interest) . . . . . . .  $1,973   $1,668    $1,468    $1,296    $1,133   

Ratio of Earnings to Fixed Charges .      28       25        19        17        16 



"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.