More than 900,000 people across the UK could be misusing over-the-counter painkillers containing codeine, a drug derived from morphine, the Tonight programme has found. There are no firm figures about the scale of this problem yet so Tonight commissioned a survey. We asked 2000 people whether they took these drugs, what they used them for and if they took them in accordance with the guidance of 6-8 tablets a day for a maximum of three days.