JOINT FILING AGREEMENT
Exhibit 1
The undersigned hereby agree that the Statement on Schedule 13G, dated January 29, 2010, with
respect to the shares of Somaxon Pharmaceuticals, Inc.’s Common Stock, par value $0.0001 per share,
is, and any amendments thereto executed by each of us shall be, filed on behalf of each of us
pursuant to and in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange
Act of 1934, as amended, and that this Agreement shall be included as an Exhibit to the Schedule
13G and each such amendment. Each of the undersigned agrees to be responsible for the timely
filing of the Schedule 13G and any amendments thereto, and for the completeness and accuracy of the
information concerning itself contained therein. This Agreement may be executed in any number of
counterparts, all of which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 29th day of
January, 2010.
| BOXER CAPITAL, LLC |
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| By: | /s/ Xxxxx Xxxxx | |||
| Name: | Xxxxx Xxxxx | |||
| Title: | Authorized Signatory | |||
| BOXER ASSET MANAGEMENT INC. |
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| By: | /s/ Xxxxxxxxx X. Xxxx | |||
| Name: | Xxxxxxxxx X. Xxxx | |||
| Title: | Director | |||
| XXXXXX XXXXX |
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| By: | /s/ Xxxxxx Xxxxx | |||
| Xxxxxx Xxxxx, Individually | ||||
| MVA INVESTORS, LLC |
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| By: | /s/ Xxxx Xxxxxxx | |||
| Name: | Xxxx Xxxxxxx | |||
| Title: | Authorized Signatory | |||
