<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE ANNUAL
FINANCIAL STATEMENTS OF INHALE THERAPUETIC SYSTEMS, INC. AS FILED ON FORM 10-K/A
FOR THE PERIOD ENDED DECEMBER 31, 1999. AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<CASH>                                          33,430
<SECURITIES>                                   104,755
<RECEIVABLES>                                    1,756
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               147,318
<PP&E>                                          78,861
<DEPRECIATION>                                (15,009)
<TOTAL-ASSETS>                                 226,806
<CURRENT-LIABILITIES>                           25,079
<BONDS>                                        108,450
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       181,156
<OTHER-SE>                                    (94,527)
<TOTAL-LIABILITY-AND-EQUITY>                   226,806
<SALES>                                              0
<TOTAL-REVENUES>                                41,358
<CGS>                                                0
<TOTAL-COSTS>                                   81,842
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             (2,075)
<INCOME-PRETAX>                               (38,448)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                         0
<EPS-BASIC>                                     (2.26)
<EPS-DILUTED>                                   (2.26)