wayne hi, a hay. al jazerra. >>> more news on aljazerra.com. >> hi, i'm lisa fletcher and you're in "the stream." 9 million americans are taking prescription drugs that may have dangerous interaction. are you one of them? find out in the next 30 minutes. if you're like nearly 70% of americans, you're taking at least one prescription medication, and as you age, that number is likely to go up. >> people are receiving this number of prescriptions, and as you get older, you get more and more prescriptions, and women tend to get more prescriptions than men. >> a ground breaking study shows that one in five older americans take medication that's work against each other, which can cause serious consequences, and in most case, doctors aren't aware that the patients are on a to collision course with their meds. like common ailment, heart conditions and high blood pressure and diabetes. how did we get to a place where millions of americans are unknowingly facing these dangerous side effects? and what can be done to protect yourself and those you love? our cohost, rajahad ali, there's tons of it, and everybody is interested in