<ARTICLE> 5
<LEGEND>
This schedule contains financial data extracted from Schering-Plough Corporation
Consolidated Financial Statements and 10-K schedules for the year ended December
31, 1999, and is qualified in its entirety by reference to such financial
statements.
</LEGEND>
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                              JAN-1-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                            1876
<SECURITIES>                                         0
<RECEIVABLES>                                     1022
<ALLOWANCES>                                        92
<INVENTORY>                                        958
<CURRENT-ASSETS>                                  4909
<PP&E>                                            4386
<DEPRECIATION>                                    1447
<TOTAL-ASSETS>                                    9375
<CURRENT-LIABILITIES>                             3209
<BONDS>                                              6
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                          1015
<OTHER-SE>                                        4150
<TOTAL-LIABILITY-AND-EQUITY>                      9375
<SALES>                                           9176
<TOTAL-REVENUES>                                  9176
<CGS>                                             1800
<TOTAL-COSTS>                                     1800
<OTHER-EXPENSES>                                  1191
<LOSS-PROVISION>                                    17
<INTEREST-EXPENSE>                                  29
<INCOME-PRETAX>                                   2795
<INCOME-TAX>                                       685
<INCOME-CONTINUING>                               2110
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      2110
<EPS-BASIC>                                       1.44
<EPS-DILUTED>                                     1.42