A PILL costing less than £3 a day is being hailed as the biggest breakthrough in stroke prevention in 50 years. The drug, which slashes the risk of suffering a stroke by over a third, will help more than a million Britons. Pradaxa is now available for use in the UK. In trials it was found to significantly reduce the risk of a stroke in patients with an irregular heartbeat, known as atrial fibrillation. This is one of the main causes of strokes. The drug, taken twice a day at a cost of £2.52, already prevents thousands of deaths each...