washington democrat elizabeth warren 19 u.s. senators voice concern chief executive mylan nv myl.o high cost epipen tuesday call device use case life-threatening allergies exorbitantly expensive mylan fire steadily raise price device 100 2008 600 currently letter mylan ceo heather bresch daughter senator joe manchin west virginia lawmakers ask company spell company program provide people low cost epipens discount program often industry tactic keep cost high complex shell game letter say insurance company government employers still bear burden excessive price turn cost eventually pass consumers form high premiums senators write mylan say week would launch first generic version allergy auto-injector epipen 300 half price brand product drugmaker second step less week counter backlash product steep price also reduce out-of-pocket cost epipen patients last week epipen 94 percent market share auto-injector devices jab dose drug epinephrine thigh counter dangerous allergic reactions peanuts foods bee sting ask letter mylan spokeswoman lauren kashtan say email statement acknowledge receipt letter congressional offices intend respond them mylan defend epipen high price say spend hundreds millions dollars improve product since acquire 2007. also say recoup less half list price epipens letter lawmakers ask mylan much insurers pay epipen 2009 much pay also ask many epipens mylan provide low income uninsured consumers many school purchase epipens versus many receive free addition warren signatories include senators patrick leahy vermont top democrat judiciary committee barbara boxer california democrat dick durbin illinois democrat jack reed sheldon whitehouse democrats rhode island sherrod brown ohio democrat senators press mylan 'exorbitantly expensive epipen