Merck & Co. Inc.’s legal department may need more than a pill to get relief from the pain of a federal judge’s ruling that conditionally certified a $250 million class action alleging discrimination against women sales representatives.

Five named women filed their amended complaint in January 2014, claiming 12 counts of discrimination and retaliation on behalf of all women similarly situated. The suit alleges that Merck systematically discriminates against female sales representatives, and pregnant women in particular, in pay, promotions and other conditions of employment.