Daily aspirin therapy cuts the risk of men having a first heart attack, but it may not have the same effect in women, suggests new research. Researchers at the University of British Columbia found that taking an aspirin a day lowers a man’s risk of having a first heart attack by 25 percent, but this reduction was not seen in women. Researchers have long examined the relationship between gender and aspirin therapy effectiveness, and are finding that some people – often women – are resistant to aspirin’s blood-thinning effects. Still, some women may benefit from taking aspirin daily. The researchers say that their findings show the importance of avoiding self-medication by consulting with a doctor first before starting aspirin therapy.