Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the reference to our firm under the caption "Experts" and to the use of our report dated January 18, 2005 (except note 20, as to which the date is , 2005), in the Registration Statement (Form F-1) and related Prospectus of Aspreva Pharmaceuticals Corporation for the registration of its common shares. Vancouver, Canada , 2005 Ernst & Young LLP The foregoing consent is in the form that will be signed upon the completion of the restatement of capital accounts described in note 20 to the consolidated financial statements. Vancouver, Canada January 24, 2005 /s/ Ernst & Young LLP