SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 6-K


                        REPORT OF FOREIGN PRIVATE ISSUER
                      PURSUANT TO RULES 13a-16 OR 15d-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                         For the Month of September 2003
                                SANOFI-SYNTHELABO
             (Exact name of registrant as specified in its charter)


                   174, avenue de France, 75013 Paris, FRANCE
                    (Address of principal executive offices)


          (Indicate by check mark whether the registrant files or will file
          annual reports under cover Form 20-F or Form 40-F.)

                     Form 20-F X                Form 40-F
                              ---                        ---


          (Indicate by check mark whether the registrant by furnishing the
          information contained in this Form is also thereby furnishing the
          information to the Commission pursuant to Rule 12g3-2(b) under the
          Securities Exchange Act of 1934.

                     Yes                        No X
                         ---                      ---


          (If "Yes" is marked, indicate below the file number assigned to the
          registrant in connection with Rule 12g3-2(b): 82-_______________.



                                                        [SANOFI-SYNTHELABO LOGO]




~ Investor Relations                                  Paris, September 2nd, 2003


              >> 2003 FIRST-HALF EPS* UP 18.6% ON A REPORTED BASIS
                        AND 31.9% AT 2002 EXCHANGE RATES

                      >> 2003 FULL-YEAR FORECASTS UPGRADED:
               AT A RATE OF 1.10 DOLLARS TO ONE EURO, EPS* GROWTH
                                  CLOSE TO 20%

     *Earnings per share before exceptional items and goodwill amortization

     FIRST HALF 2003:
o    Acceleration in consolidated sales growth in the second quarter to
     15.4%(1), against 13.4%(1) in the first quarter.
          -    Very strong growth in first-half consolidated sales of
               Plavix(R)(27%(1)), Aprovel(R)(29.5%(1)) and Ambien(R)(20.8%(1)).
          -    Confirmation of blockbuster status for Eloxatin(R)
o    Continued investment in R&D, with expenditure up by 12.9% at 2002 exchange
     rates and by 5.8% on a reported basis.
          -    Progress to phase III of xaliprodene in Alzheimer's disease and
               SR 58611 in depression
          -    Progress to phase II b of SR 57667 in Alzheimer's disease
o    Strong growth in operating profit, up by 30.3% at 2002 exchange rates and
     by 12.8% on a reported basis.
o    First-half net income(2) 27.5% higher at 2002 exchange rates and 14.4%
     higher on a reported basis.
o    2003 first-half EPS(2) up 18.6% at 1.34 euros, ahead of the Group's
     forecasts.

OUTLOOK FOR 2003:
o    Upgrade to our forecast for 2003 full-year sales growth, which we now
     expect to be in the region of 15% on a comparable basis, as opposed to our
     initial forecast of close to 12.8%.
o    Growth of close to 20% in full-year 2003 EPS(2) expected at an average
     annual rate of 1.10 dollars to one euro (as opposed to the 1 dollar per
     euro rate previously assumed), giving an upgrade of 20% to our original
     forecast for 2003 full-year EPS(2) growth. The sensitivity of this growth
     rate to fluctuations in the dollar is unchanged at 1% for a 3-cent
     movement.
o    These revised expectations are, after taking account of a sustained effort
     during the second half of the year designed to build for the future,
     involving:
          -    an acceleration in R&D spend, associated with clinical trials;
          -    a reinforcement of marketing resources, especially in the United
               States for the launch of Uroxatral(R).



----------------------------
(1)  on a comparable basis
(2)  before exceptional items and goodwill amortization



SHARE BUY-BACK PROGRAM 2003/2004:

o    New authorization(3) for 1 billion euros, without any significant impact on
     2003 EPS(2)



On September 1st, 2003, the Sanofi-Synthelabo Board of Directors examined the
Group's consolidated financial statements for the six months to June 30, 2003.


o    Sanofi-Synthelabo generated consolidated sales of 3,903 million euros in
     the first half of 2003, an increase of 14.4% on a comparable basis(4) and
     6.1% on a reported basis.
     Currency fluctuations had an unfavorable impact of 7.8 percentage points
     over the half-year. Of this, half was due to the weakening of the US
     dollar, and the rest was due to the weakness of some Latin American and
     Asian currencies. Changes in Group structure(5) had an unfavorable impact
     of 0.5 of a percentage point over the half-year.

o    Gross profit was 3,153 million euros, a rise of 6.0%. At 2002 exchange
     rates, gross profit would have risen by 16.9%.
     The gross margin rate was unchanged relative to the first half of 2002 at
     80.8%. This reflects a favorable product mix/industrial cost effect, offset
     by a negative currency effect. At 2002 exchange rates, the gross margin
     rate would have been 81.9%, an improvement of 1.1 percentage points.

o    Research and development expenses increased by 5.8% during the first half
     of 2003 to 621 million euros, representing 15.9% of sales, in line with the
     2002 first-half figure. At 2002 exchange rates, research and development
     expenses would have risen by 12.9%. This increase was mainly due to major
     clinical trials programs covering products already on the market
     (Plavix(R), Aprovel(R)/Avapro(R)), products in phase III (rimonabant,
     idraparinux, zolpidem MR, tirapazamine), and phase I and II projects.
     During the second half of the year, the rate of growth in research and
     development expenditure is likely to accelerate, due in particular to the
     progress of two new compounds into phase III.

o    Selling and general expenses amounted to 1,204 million euros, 2.8% lower
     than in the first half of 2002. At 2002 exchange rates, rigorous cost
     management kept general expenses stable, restricting the rise in selling
     and general expenses to 5.1%. Marketing spend rose by 6.6% at 2002 exchange
     rates. Growth in marketing spend should accelerate in the second half of
     2003, especially in the United States in anticipation of the launch of
     Uroxatral(R).



----------------------------

(3)  decided by the Board of Directors further to being authorized by the
     Shareholders'Meeting of May, 19th 2003 (Prospectus visa COB n. 03-299 dated
     April 22nd 2003).

(4)  Comparable basis means constant Group structure and constant 2003 exchange
     rates

(5)  Primarily, change from full consolidation to 51% proportionate
     consolidation of Sanofi-Synthelabo-Fujisawa (Taiwan) in May 2002



o    Other operating income and expenses, mainly comprising transfers in respect
     of joint operations with our partners (primarily Bristol-Myers Squibb),
     represented a net gain of 63 million euros, against 85 million euros for
     the first half of 2002. At 2002 exchange rates, this item would have shown
     an increase of about 12.9%. The reported-basis decline in this item was due
     mainly to the following factors:
     -    Negative currency effect on the share of profits generated by
          Plavix(R)and Avapro(R)in the United States transferred by
          Bristol-Myers Squibb.
     -    An increase in profits transferred to Bristol-Myers Squibb as a result
          of the strong growth of Plavix(R)and Aprovel(R)in Europe.

o    Operating profit rose to 1,391 million euros in the first half of 2003, up
     by 12.8% over the first half of 2002. The operating margin rate advanced by
     more than 2 percentage points to 35.6%, against 33.5% in the first half of
     2002. If the net gains arising from the Group's currency hedging policy had
     been recognized at operating level, operating profit would have risen by
     approximately 16%. At 2002 exchange rates, growth in operating profit would
     have been 30.3%.

o    During the first half of 2003, net financial income totaled 63 million
     euros, compared with 28 million euros in the first half of 2002. The
     reduction in the Group's net cash position as a result of the share
     buy-back program initiated in 2002 and a fall in the rate of interest on
     the investment of surplus cash led to a decline in investment income.
     However, two other factors resulted in an overall increase in net financial
     income:

     -    A net foreign exchange gain generated by the Group's hedging policy of
          53 million euros in the first half of 2003, against 13 million euros
          in the first half of 2002.
     -    A further charge of 20 million euros in the first half of 2003 to the
          provision for treasury shares allocated to stock option plans, against
          the 38 million euros charged in the first half of 2002.

o    Income taxes amounted to 458 million euros, against 313 million euros in
     the first half of 2002, bringing the Group's effective tax rate to 33%
     (versus 26% in the first half of 2002). The effective tax rate was
     abnormally low in the first half of 2002, due to the write-back of
     provisions for taxes and to the non-taxation of the share of Lorex profits
     transferred to Pharmacia.

o    Minority interests came to 2 million euros, compared with 83 million euros
     in the first half of 2002. The 2002 first-half figure mainly comprised the
     entitlement of Pharmacia to a share in the profits of the Lorex joint
     venture for the period from January 1st, 2002 through April 16th, 2002, the
     date on which Sanofi-Synthelabo bought out Pharmacia's 51% interest in
     Lorex.

o    Net income came to 944 million euros, an increase of 13.7%. At 2002
     exchange rates, the increase would have been 26.7%.

o    Net income before exceptional items and goodwill amortization totaled 947
     million euros, a rise of 14.4%. At 2002 exchange rates, the rise would have
     been 27.5%.

o    Earnings per share before exceptional items and goodwill amortization was
     1.34 euros, compared with 1.13 euros for the first half of 2002, an
     increase of 18.6%. At 2002 exchange rates, the increase would have been
     31.9%. The difference between growth in net income and growth in earnings
     per share was mainly due to the share buy-back initiated in 2002. The
     average number of shares used to calculate earnings per share for the first
     half of 2003 was 706.5 million, against 731.8 million for the first half of
     2002.




Implementation of the share buy-back programs authorized by the General Meetings
of May 22nd, 2002 and May 19th, 2003 led to the repurchase of 13.9 million
shares, acquired during the first half of 2003 in the light of market conditions
for a total of 688 million euros. As of August 31st, 2003, the Group owned 32.3
million shares acquired under the share buy-back programs implemented since
2002. These shares, acquired in the light of market conditions for a total of
1,749 million euros, represented 4.41% of the capital.

The net cash position in the balance sheet as of June 30th, 2003 stood at 1,967
million euros (versus 2,672 million euros as of December 31st, 2002), including
treasury shares amounting to 599 million euros held in connection with stock
option plans.




Recent events
-------------

-    Announcement in June 2003 at the 39th annual conference of the ASCO
     (American Society of Clinical Oncology) of major results with oxaliplatine
     (Eloxatin(R)), clearly demonstrating consistent superiority in the
     treatment of colorectal cancer at all settings of the disease (early stage,
     adjuvant treatment after surgery, metastatic settings).

-    Approval in June 2003 by the US Food and Drug Administration of
     Uroxatral(R)in the treatment of the signs and symptoms of benign prostatic
     hypertrophy.

-    Approval in June 2003 by the US Food and Drug Administration, and favorable
     opinion in July 2003 from the Committee for Proprietary Medicinal Products
     on approval for marketing in Europe, for Arixtra(R) in the long-term
     prevention of deep venous thrombosis in patients undergoing hip fracture
     surgery.

-    Announcement in July 2003 at the 19th conference of the ISTH (International
     Society on Thrombosis and Haemostasis) of favorable results with
     Arixtra(R), demonstrating a significant reduction of the risk of deep
     venous thrombosis in medical patients (ARTEMIS study) and benefits in
     prevention of deep venous thrombosis after major abdominal surgery (PEGASUS
     study).

-    In connection with the Plavix litigation in the United States, and as
     announced on June 20th, 2003, patent "328" expiring 2014 has been withdrawn
     from the patent infringement action and will be delisted from the Food and
     Drug Administration "Orange Book". This withdrawal has no effect on product
     patent "265" expiring 2011, which protects clopidogrel, the active
     ingredient of Plavix, which we are confidently defending. As regards the
     action itself, fact discovery is scheduled to end on October 15th, 2003,
     with the pre-trial order expected towards mid-2004. The trial itself will
     follow, on a date to be fixed by the Court.



       Sanofi-Synthelabo consolidated statements of income
       ---------------------------------------------------






                                                                       ----------------------------------------------------
In millions of euros                                                        H1 2002          H1 2003           Change
===========================================================================================================================
                                                                                                       
Net sales                                                                    3,680            3,903            +6.1%
===========================================================================================================================
Gross profit                                                                 2,974            3,153            +6.0%
===========================================================================================================================
Research and development expenses                                            (587)            (621)            +5.8%
---------------------------------------------------------------------------------------------------------------------------
Selling and general expenses                                                (1,239)          (1,204)           -2.8%
---------------------------------------------------------------------------------------------------------------------------
Other operating income/(expense), net                                         85                63             -25.9%
===========================================================================================================================
Operating profit                                                             1,233            1,391            +12.8%
===========================================================================================================================
Intangibles - amortization and impairment                                    (55)              (66)            +20.0%
---------------------------------------------------------------------------------------------------------------------------
Financial income/(expense), net                                               28                63            +125.0%
---------------------------------------------------------------------------------------------------------------------------
Exceptional items                                                              6                1                -
---------------------------------------------------------------------------------------------------------------------------
Income taxes                                                                 (313)            (458)            +46.3%
---------------------------------------------------------------------------------------------------------------------------
Income from equity investees, net                                             18                19             +5.6%
---------------------------------------------------------------------------------------------------------------------------
Goodwill amortization                                                         (4)              (4)               -
---------------------------------------------------------------------------------------------------------------------------
Minority interests                                                           (83)              (2)               -
===========================================================================================================================
Net income                                                                    830              944             +13.7%
===========================================================================================================================
Exceptional items and goodwill amortization, net of income taxes              (2)               3                -
===========================================================================================================================

Net income before exceptional items and goodwill amortization                 828              947             +14.4%
===========================================================================================================================
Average number of shares outstanding                                      731,762,997      706,514,070           -
===========================================================================================================================
Earnings per share before exceptional items and goodwill                     1.13              1.34            +18.6%
amortization, in euros
===========================================================================================================================





       Sanofi-Synthelabo simplified balance sheet
       ------------------------------------------





In millions of euros
==================================================================================================================

ASSETS                          June 30,        June 30,   LIABILITIES &               June 30,         June 30,
                                  2002            2003     SHAREHOLDERS'                2002              2003
                                                           EQUITY

==================================================================================================================
                                                                                          
Total fixed assets                  2,879        2,819     Shareholders' equity            5,905         5,591
------------------------------------------------------------------------------------------------------------------
Deferred income taxes                487           471     Minority interests               10            18
------------------------------------------------------------------------------------------------------------------
Inventories, accounts               3,022        3,273     Other long-term liabilities      813           780
receivable and other current
assets
------------------------------------------------------------------------------------------------------------------
Short-term investments and          3,045        2,274     Accounts payable and other      2,252         2,141
deposits, cash                                             short-term liabilities
------------------------------------------------------------------------------------------------------------------
                                                           Debt                             453           307
==================================================================================================================

Total assets                        9,433        8,837     Total liabilities &             9,433         8,837
                                                           shareholders' equity
------------------------------------------------------------------------------------------------------------------





       Sanofi-Synthelabo simplified statement of cash flows
       ----------------------------------------------------






                                                                        ------------------------------------------
                                                                                              
    In millions of euros                                                      H1 2002              H1 2003
    --------------------------------------------------------------------------------------------------------------

    Operating cash flow before changes in working capital                      1,087                1,114
    --------------------------------------------------------------------------------------------------------------
    Changes in working capital                                                 (697)                (355)
    --------------------------------------------------------------------------------------------------------------
    Net cash provided by operating activities                                   390                  759
    --------------------------------------------------------------------------------------------------------------
    Total investments                                                         (1,026)               (187)
    --------------------------------------------------------------------------------------------------------------
    Asset disposals and other items                                              17                   6
    --------------------------------------------------------------------------------------------------------------
    Net cash used in investing activities                                     (1,009)               (181)
    --------------------------------------------------------------------------------------------------------------
    Change in borrowings and other items                                         68                 (102)
    --------------------------------------------------------------------------------------------------------------
    Dividends paid                                                             (476)                (582)
    --------------------------------------------------------------------------------------------------------------
    Repurchase of own shares                                                   (386)                (684)
    --------------------------------------------------------------------------------------------------------------
    Net cash used in financing activities                                      (794)               (1,368)
    --------------------------------------------------------------------------------------------------------------
    Net change in cash and cash equivalents                                   (1,413)               (790)
    --------------------------------------------------------------------------------------------------------------





First-half consolidated sales by geographical region
----------------------------------------------------


                      ----------------------------------------------------------------------------------------------
                                                                                    Change on a          Change
  Millions of euros         H1 2003            H1 2002            H1 2002           comparable       on a reported
                                            (comparable)        (reported)             basis             basis
--------------------------------------------------------------------------------------------------------------------
                                                                                            
Europe                       2,320              2,151              2,176               +7.9%              +6.6%
United States                  884                631                756              +40.1%             +16.9%
Rest of the world              699                630                749              +11.0%              -6.7%
--------------------------------------------------------------------------------------------------------------------
        Total                3,903              3,412              3,680              +14.4%              +6.1%
--------------------------------------------------------------------------------------------------------------------





First-half consolidated sales of the top 10 products
----------------------------------------------------

                      ----------------------------------------------------------------------------------------------
                                                                                    Change on a          Change
  Millions of euros         H1 2003            H1 2002            H1 2002           comparable       on a reported
                                            (comparable)        (reported)             basis             basis
--------------------------------------------------------------------------------------------------------------------
 Stilnox(R)/Ambien(R)          627                519                623              +20.8%              +0.6%
 Plavix(R)                     612                482                496              +27.0%             +23.4%
 Eloxatin(R)                   384                120                124             +220.0%            +209.7%
 Aprovel(R)                    334                258                266              +29.5%             +25.6%
 Fraxiparine(R)                166                160                166               +3.8%              +0.0%
 Depakine(R)                   137                130                135               +5.4%              +1.5%
 Xatral(R)                     103                 86                 89              +19.8%             +15.7%
 Cordarone(R)                   73                 80                 85               -8.8%             -14.1%
 Solian(R)                      71                 67                 68               +6.0%              +4.4%
 Tildiem(R)                     67                 72                 73               -6.9%              -8.2%
-----------------------------------------------------------------------------------------------------------------
 Total                       2,574              1,974              2,125              +30.4%             +21.1%
-----------------------------------------------------------------------------------------------------------------







Explanatory notes:
------------------

All figures in this press release are in French GAAP.

In this press release, we refer to our historical sales as "reported" sales.
In addition to reported sales, we also present and discuss two other non-GAAP
indicators that we believe are useful measurement tools to explain changes in
our reported sales:

Comparable sales: When we refer to the change in our sales on a "comparable"
basis, we mean that we exclude the impact of exchange rate fluctuations and
changes in Group structure (acquisitions and divestitures of entities and rights
to products as well as change in the consolidation percentage for consolidated
entities).
For any two periods, we exclude the impact of exchange rates by recalculating
sales for the earlier period on the basis of exchange rates used in the later
period.
We exclude the impact of acquisitions by including sales for a portion of the
prior period equal to the portion of the current period during which we owned
the entity or product rights based on sales information we receive from the
party from whom we make the acquisition. Similarly, we exclude sales in the
relevant portion of the prior period when we have sold an entity or rights to a
product.
For a change in the consolidation percentage of a consolidated entity, the prior
period is recalculated on the basis of the consolidation method used for the
current period.

Developed sales When we refer to "developed sales" of a product, we mean
consolidated sales, excluding sales of products to our alliance partners, but
including those that are made through our alliances and which are not included
in our consolidated sales (with Bristol-Myers Squibb on Plavix (R) /Iscover (R)
(clopidogrel) and Aprovel (R) /Avapro (R) /Karvea (R) (irbesartan), with
Fujisawa on Stilnox (R) /Myslee (R) (zolpidem), and with Organon on Arixtra (R)
(fondaparinux)). Our alliance partners provide us with information regarding
their sales in order to allow us to calculate developed sales.
We believe that developed sales are useful measurement tool because they
demonstrate trends in the overall presence of our products in the market.

                                  ------------

This release contains statements that constitute forward-looking statements
within the meaning of the U.S. Private Securities Litigation Reform Act of 1995.
These statements are based on management's current expectations or beliefs and
are subject to a number of factors and uncertainties that could cause actual
results to differ materially from those described in the forward-looking
statements. The following factors, among others, could cause actual results to
differ materially from those described in the forward-looking statements: the
ability of Sanofi-Synthelabo to expand its presence profitably in the United
States; the success of Sanofi-Synthelabo's research and development programs;
the ability of Sanofi-Synthelabo to protect its intellectual property rights;
and the risks associated with reimbursement of health care costs and pricing
reforms, particularly in the United States and France. Sanofi-Synthelabo does
not undertake any obligation to provide updates or to revise any forward-looking
statements.

Investors and security holders may obtain a free copy of documents filed by
Sanofi-Synthelabo with the French Commission des Operations de Bourse at
www.cob.fr and with the US Securities and Exchange Commission at www.sec.gov, or
directly from Sanofi-Synthelabo on the web site www.sanofi-synthelabo.com.



Investor Relations Department:
Philippe Goupit            Director of Investor Relations
Arnaud Delepine            Investor Relations Europe
Sanjay Gupta               Investor Relations US
Isabelle Laurent           Investor Relations


Contacts:
E-mail: investor-relations@sanofi-synthelabo.com
Europe                                              United States
Tel: + 33 1 53 77 45 45                             Tel:  00 1 212 551 42 93
Fax: + 33 1 53 77 42 96                             Fax:  00 1 212 551 49 92





                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

Dated: September 2, 2003

                                        SANOFI-SYNTHELABO


                                        By:  /s/ Marie-Helene Laimay
                                             ---------------------------------
                                             Name:  Marie-Helene Laimay
                                             Title: Senior Vice President and
                                                    Chief Financial Officer