EXHIBIT 1
JOINT FILING AGREEMENT
By this Agreement, the undersigned agree that this Statement on Schedule
13D being filed on or about this date, and any subsequent amendments thereto
filed by any of us, with respect to the securities of NeurogesX, Inc. is being
filed on behalf of each of us.
February 22, 2010
XXXXX XXXXX
/s/ Xxxxxxxx Xxxxx
----------------------------
By: Xxxxxxxx Xxxxx*
Title: Attorney-in-fact
X. XXXXX (1999) LTD.
/s/ Xxxxxxxx Xxxxx
----------------------------
By: Xxxxxxxx Xxxxx**
Title: Attorney-in-fact for Xxxxx Xxxxx,
Chairman of X. Xxxxx (1999) Ltd.
SPHERA FUNDS MANAGEMENT LTD.
/s/ Xxxxx Xxxxxx
----------------------------
By: Xxxxx Xxxxxx
Title: CEO
ISRAEL MOR
/s/ Israel Mor
----------------------------
By: Israel Mor
XXXXX XXXXX
/s/ Xxxxx Xxxxx
----------------------------
By: Doron Xxxxx
XXX SENATOR
/s/ Xxx Senator
----------------------------
By: Xxx Senator
* Duly authorized under Special Power of Attorney appointing Xxxxxxxx Xxxxx
attorney-in-fact, dated August 12, 2009 by and on behalf of Xxxxx Xxxxx
(incorporated herein by reference to Exhibit 2 to the Schedule 13G filed by
Xxxxx Xxxxx, X. Xxxxx (1999) Ltd., Sphera Global Healthcare GP Ltd., Sphera
Global Healthcare Management L.P., Sphera Global Healthcare Fund, and Sphera
Global Healthcare Master Fund on August 13, 2009 (the "Original Schedule 13G)).
** Duly authorized under Special Power of Attorney appointing Xxxxxxxx Xxxxx
attorney-in-fact, dated August 12, 2009 by and on behalf of Xxxxx Xxxxx as
Chairman X. Xxxxx (1999) Ltd. (incorporated herein by reference to Exhibit 3 to
the Original Schedule 13G).
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