Zelnorm, manufactured by Novartis Pharmaceuticals, was approved by the FDA in 2002 for the treatment of irritable bowel syndrome. Zelnorm was pulled from the market in March 2007 in the wake of studies that linked the drug to serious cardiovascular problems, such as heart attack, angina, and stroke. In these studies, .11% of patients taking Zelnorm suffered serious, even fatal, heart problems, compared with only .01% of patients taking a placebo. Symptoms of Zelnorm's adverse side effects include chest pains, shortness of breath, and dizziness. If you or a loved one has suffered cardiovascular problems as a result of taking Zelnorm, contact an experienced defective drug attorney to discuss your case.