Healthcare firm Reckitt Benckiser is laying off 160 workers in Nottingham as part of a streamlining of its production lines. The firm bought the Boots Healthcare International business in October 2005. Two of the three production lines making Nurofen and Optrex will merge into one, managers said. Unions and employees are being consulted about early retirement and voluntary redundancies, a Reckitt Benckiser spokesman said. The firm has already invested £2m in its Nottingham site with another £2.7m investment in production facilities and equipment planned. The changes will be phased in between October 2006 and June 2007.