The Food & Drug Administration (FDA) warned yesterday that 3 asthma drugs might increase the risk of severe asthma attacks and even death. The agency asked the manufactureres of Adavir, Serevent and Foradil to strengthen the labels to reflect this risk. The FDA said that even though the drugs decrease the frequency of asthma attacks, they can make the attacks more severe when they occur. The agency said the drugs should be prescribed only if other medicines dont help. The FDA cautioned patients not to stop taking the drugs without consulting their doctors. The agency asked the drug makers to update product labels and medication guides for patients and doctors outlining the dangers.