Drug companies accused of holding back complete information on clinical trials
MPs voice concern after report into decision to stockpile Tamiflu finds discussions about effectiveness hampered by practice

A review of 20 existing studies into Tamiflu by the Cochrane Collaboration concluded it ‘did not reduce influenza-related lower respiratory tract complications’. Photograph: Clive Gee/PA
Clinical trial results are being routinely withheld from doctors, undermining their ability to make informed decisions about how to treat patients, an influential parliamentary committee has claimed.