<ARTICLE> 5
<LEGEND>
This schedule contains financial data extracted from Schering-Plough Corporation
and Subsidiaries consolidated financial statements for the nine months ended
September 30, 1999, and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                            1665
<SECURITIES>                                         0
<RECEIVABLES>                                     1068
<ALLOWANCES>                                         0
<INVENTORY>                                        965
<CURRENT-ASSETS>                                  4790
<PP&E>                                            4277
<DEPRECIATION>                                    1451
<TOTAL-ASSETS>                                    9060
<CURRENT-LIABILITIES>                             3310
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                          1015
<OTHER-SE>                                        3725
<TOTAL-LIABILITY-AND-EQUITY>                      9060
<SALES>                                           6873
<TOTAL-REVENUES>                                  6873
<CGS>                                             1342
<TOTAL-COSTS>                                     1342
<OTHER-EXPENSES>                                   864
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                   2125
<INCOME-TAX>                                       521
<INCOME-CONTINUING>                               1604
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      1604
<EPS-BASIC>                                       1.09
<EPS-DILUTED>                                     1.08