The FDA is saying that PPA, in cold and diet drugs, may cause strokes. Anyway, I've found a web site that explains about PPA and its relationship to hemorraghic strokes [url="http://www.fda.gov/cder/drug/infopage/ppa/default.htm"]http://www.fda.gov/cder/drug/infopage/ppa/default.htm[/url]