<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM MEDIMMUNE,
INC.'S YEARLY REPORT ON FORM 10-K FOR THE TWELVE MONTHS ENDED DECEMBER 31, 1998
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FILING.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                          37,959
<SECURITIES>                                    96,923
<RECEIVABLES>                                   31,682
<ALLOWANCES>                                         0
<INVENTORY>                                     19,760
<CURRENT-ASSETS>                               216,366
<PP&E>                                          74,822
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                 353,120
<CURRENT-LIABILITIES>                           57,970
<BONDS>                                         83,195
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           547
<OTHER-SE>                                     209,286
<TOTAL-LIABILITY-AND-EQUITY>                   353,120
<SALES>                                        163,440
<TOTAL-REVENUES>                               200,708
<CGS>                                           70,236
<TOTAL-COSTS>                                  194,514
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               4,041
<INCOME-PRETAX>                                  8,812
<INCOME-TAX>                                  (47,428)
<INCOME-CONTINUING>                             56,420
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    56,240
<EPS-PRIMARY>                                     1.06
<EPS-DILUTED>                                     0.91