MARLBOROUGH, Mass.--(BUSINESS WIRE)--Sepracor Inc. (Nasdaq: SEPR) will announce its first quarter 2007 financial results on April 24, 2007. In conjunction with the press release, Sepracor will host a conference call and live webcast beginning at 8:30 a.m. ET on April 24, 2007 to discuss its first quarter 2007 financial results.