EXHIBIT 99.1
LA JOLLA PHARMACEUTICAL COMPANY
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
Each of the undersigned, in his or her capacity as an officer of La Jolla
Pharmaceutical Company (the "Registrant"), hereby certifies, for purposes of 18
U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:
- the quarterly report of the Registrant on Form 10-Q for the
quarter ended March 31, 2003 (the "Report"), which accompanies
this certification, fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934;
and
- the information contained in the Report fairly presents, in all
material respects, the financial condition of the Registrant at
the end of such quarter and the results of operations of the
Registrant of such quarter.
Dated: May 12, 2003
/s/ Steven B. Engle
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Steven B. Engle
Chairman and Chief Executive Officer
/s/ Gail A. Sloan
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Gail A. Sloan
Senior Director of Finance, Controller
and Secretary
Note: A signed original of this written statement required by Section 906 has
been provided to La Jolla Pharmaceutical Company and will be retained
by La Jolla Pharmaceutical Company and furnished to the Securities and
Exchange Commission or its staff upon request.