A New Orleans jury today handed Merck a victory in its latest federal Vioxx trial.The jury ruled that the drug maker adequately warned of the risks associated with the medicine.The lawsuit was filed by plaintiff Anthony Wayne Dedrick, 50, of Waynesboro, TN, who argued that his heart attack resulted from Merck failing to warn doctors adequately about the risk posed by taking the withdrawn painkiller Vioxx. Today’s ruling brings Merck’s federal Vioxx case win total to four. In state courts, Merck has won three and lost three cases. Jurors in a case in New Jersey decided in Merck’s favor, but the judge later ordered a retrial.