Dallas Business Journal -- KV Pharmaceutical Co.’s plan to lay off about 1,700 employees will impact workers in North Texas. The St. Louis-based pharmaceutical company and its subsidiary, Bridgeton, Mo.-based Ther-Rx Corp., wrote in a March 6 letter to the Texas Workforce Commission that it would lay off five sales employees in its Coppell office. In addition, eight employees will be laid off at the company’s Frisco office.