<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
THE SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM KOS
PHARMACEUTICALS, INC.'S FORM 10-Q FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2000,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> APR-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 3,929
<SECURITIES> 0
<RECEIVABLES> 5,771
<ALLOWANCES> (257)
<INVENTORY> 1,591
<CURRENT-ASSETS> 13,962
<PP&E> 18,562
<DEPRECIATION> 9,305
<TOTAL-ASSETS> 24,045
<CURRENT-LIABILITIES> 15,415
<BONDS> 0
0
0
<COMMON> 197
<OTHER-SE> (54,592)
<TOTAL-LIABILITY-AND-EQUITY> 24,045
<SALES> 9,122
<TOTAL-REVENUES> 10,159
<CGS> 1,131
<TOTAL-COSTS> 20,758
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 1,671
<INCOME-PRETAX> (12,270)
<INCOME-TAX> 0
<INCOME-CONTINUING> (12,270)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (12,270)
<EPS-BASIC> (0.65)
<EPS-DILUTED> (0.65)
</TABLE>