eyewear that works as hard as they do. right now, buy one pair and get another free. quality eyewear for doers. sears optical they represent blood cells. and if you have afib-an irregular heartbeat that may put you at five times greater risk of stroke they can pool together in the heart, forming a clot that can break free and travel upstream to the brain, where it can block blood flow and cause a stroke. but if you have afib that's not caused by a heart valve problem, pradaxa can help stop clots from forming. pradaxa was even proven superior to warfarin at reducing the risk of stroke, in a clinical trial without the need for regular blood tests. and, in the rare event of an emergency, pradaxa is the only oral blood thinner other than warfarin with a specific reversal treatment to help your body clot normally again. pradaxa is not for people who have had a heart valve replacement. don't stop taking pradaxa without talking to your doctor. stopping increases your risk of stroke or blood clots ask your doctor if you need to stop pradaxa