X0202 4 2006-09-18 0001339455 Somaxon Pharmaceuticals, Inc. SOMX 0001207789 SCHOEMAKER KATHLEEN K C/O DOMAIN ASSOCIATES, LLC ONE PALMER SQUARE PRINCETON NJ 08542 0 0 1 0 Common Stock 2006-09-18 4 S 0 6459 13.03 D 25838 I By DP VI Associates, L.P. The Reporting Person is a Managing Member of Domain Associates, L.L.C. and a Managing Member of One Palmer Square Associates VI, L.L.C., which is the sole general partner of Domain Partners VI, L.P. and DP VI Associates, L.P. Pursuant to Instruction 4(b)(iv) of Form 4, the Reporting Person has elected to report as indirectly beneficially owned the entire number of securities beneficially owned by each such entity. The Reporting Person disclaims beneficial ownership of any securities, and any proceeds thereof, that exceed his or her pecuniary interest therein and/or that are not actually distributed to him or her. The Reporting Person also indirectly beneficially owns 19,166 shares of Common Stock held by Domain Associates, L.L.C. and 2,285,789 shares of Common Stock held by Domain Partners VI, L.P. /s/ Kathleen K. Schoemaker 2006-09-19