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

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                            1523
<SECURITIES>                                         0
<RECEIVABLES>                                     1018
<ALLOWANCES>                                         0
<INVENTORY>                                        861
<CURRENT-ASSETS>                                  4460
<PP&E>                                            4153
<DEPRECIATION>                                    1412
<TOTAL-ASSETS>                                    8619
<CURRENT-LIABILITIES>                             3211
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                          1015
<OTHER-SE>                                        3383
<TOTAL-LIABILITY-AND-EQUITY>                      8619
<SALES>                                           4637
<TOTAL-REVENUES>                                  4637
<CGS>                                              904
<TOTAL-COSTS>                                      904
<OTHER-EXPENSES>                                   559
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                   1439
<INCOME-TAX>                                       353
<INCOME-CONTINUING>                               1086
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      1086
<EPS-BASIC>                                        .74
<EPS-DILUTED>                                      .73